abter steel pipe manufacturer, natural gas casing and tubing,seamless steel pipe,OCTG, http://www.abtersteel.com OCTG pipe,carbon steel pipe,seamless steel pipe ,erw pipe Tue, 16 Oct 2018 13:07:08 +0000 en-US hourly 1 https://wordpress.org/?v=4.9.8 SCH40/80 Seamless Pipe Stock , 1/2”-8” http://www.abtersteel.com/stock/sch40-80-seamless-pipe-stock-1-2-8/ Tue, 16 Oct 2018 13:07:08 +0000 http://www.abtersteel.com/?p=4416 This week our steel market has good news that the seamless steel pipes price become better. Meanwhile our USD to CNY Currency exchange rate keeps increasing. Now it’s really good chance to have cheaper steel price to do purchasing.     Besides, we have left a batch of newly seamless pipes in stock.The pipes are in good quality, good surface. Pls see following. If any size meet your requirement, pls contact me immediately. These pipes are sells very fast.   PIPE  STANDARD INCH OD (mm) WT (mm)   LENGTH (mtr) KG/M METERS TONS DELIVERY 1 SMLS API 5L / ASTM A106  GR.B 1/2” 21.3 2.77 6-6.1m 1.27  31602  40.00  […]

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This week our steel market has good news that the seamless steel pipes price become better.
Meanwhile our USD to CNY Currency exchange rate keeps increasing. Now it’s really good chance to have cheaper steel price to do purchasing.
 
 
Besides, we have left a batch of newly seamless pipes in stock.The pipes are in good quality, good surface. Pls see following.
If any size meet your requirement, pls contact me immediately. These pipes are sells very fast.
  PIPE  STANDARD INCH OD
(mm)
WT
(mm)  
LENGTH
(mtr)
KG/M METERS TONS DELIVERY
1 SMLS API 5L / ASTM A106  GR.B 1/2” 21.3 2.77 6-6.1m 1.27  31602  40.00  3-7 days
2 SMLS API 5L / ASTM A106  GR.B 1/2” 21.3 3.73 6-6.1m 1.62  24752  40.00  3-7 days
3 SMLS API 5L / ASTM A106  GR.B 3/4” 26.7 2.87 6-6.1m 1.69  23718  40.00  3-7 days
4 SMLS API 5L / ASTM A106  GR.B 3/4” 26.7 3.91 6-6.1m 2.20  18204  40.00  3-7 days
5 SMLS API 5L / ASTM A106  GR.B 1” 33.4 2.6 6-6.1m 1.97  15192  30.00  3-7 days
6 SMLS API 5L / ASTM A106  GR.B 1” 33.4 3.38 6-6.1m 2.50  30773  77.00  3-7 days
7 SMLS API 5L / ASTM A106  GR.B 1” 33.4 4.55 6-6.1m 3.24  18536  60.00  3-7 days
8 SMLS API 5L / ASTM A106  GR.B 1” 33.4 6.35 6-6.1m 4.24  4670  20.00  3-7 days
9 SMLS API 5L / ASTM A106  GR.B 1 1/4” 42.2 3.2 6-6.1m 3.08  9748  30.00  3-7 days
10 SMLS API 5L / ASTM A106  GR.B 1 1/4” 42.2 3.56 6-6.1m 3.39  11792  40.00  3-7 days
11 SMLS API 5L / ASTM A106  GR.B 1 1/4” 42.2 4.85 6-6.1m 4.47  8956  40.00  3-7 days
12 SMLS API 5L / ASTM A106  GR.B 1 1/2” 48.3 3.2 6-6.1m 3.56  8430  30.00  3-7 days
13 SMLS API 5L / ASTM A106  GR.B 1 1/2” 48.3 3.68 6-6.1m 4.05  19158  77.57  3-7 days
14 SMLS API 5L / ASTM A106  GR.B 1 1/2” 48.3 5.08 6-6.1m 5.41  14776  80.00  3-7 days
15 SMLS API 5L / ASTM A106  GR.B 1 1/2” 48.3 7.14 6-6.1m 7.25  2760  20.00  3-7 days
16 SMLS API 5L / ASTM A106  GR.B 2” 60.3 3.6 6-6.1m 5.03  3974  20.00  3-7 days
17 SMLS API 5L / ASTM A106  GR.B 2” 60.3 3.91 6-6.1m 5.44  9476  51.52  3-7 days
18 SMLS API 5L / ASTM A106  GR.B 2” 60.3 5 6-6.1m 6.82  2934  20.00  3-7 days
19 SMLS API 5L / ASTM A106  GR.B 2” 60.3 5.54 6-6.1m 7.48  5348  40.00  3-7 days
20 SMLS API 5L / ASTM A106  GR.B 2” 60.3 6.3 6-6.1m 8.39  2384  20.00  3-7 days
21 SMLS API 5L / ASTM A106  GR.B 2” 60.3 7 6-6.1m 9.20  2174  20.00  3-7 days
22 SMLS API 5L / ASTM A106  GR.B 2” 60.3 8.74 6-6.1m 11.11  1800  20.00  3-7 days
23 SMLS API 5L / ASTM A106  GR.B 2 1/2” 73 5.16 6-6.1m 8.63  817  7.05  3-7 days
24 SMLS API 5L / ASTM A106  GR.B   76.1 5 6-6.1m 8.77  1450  12.70  3-7 days
25 SMLS API 5L / ASTM A106  GR.B 3” 89 3.6 6-6.1m 7.58  3958  30.00  3-7 days
26 SMLS API 5L / ASTM A106  GR.B 3” 89 5.49 6-6.1m 11.31  3538  40.00  3-7 days
27 SMLS API 5L / ASTM A106  GR.B 3” 89 6.3 6-6.1m 12.85  1558  20.00  3-7 days
28 SMLS API 5L / ASTM A106  GR.B 3” 89 9.5 6-6.1m 18.63  1074  20.00  3-7 days
29 SMLS API 5L / ASTM A106  GR.B 4” 114.3 4.5 6-6.1m 12.19  2464  30.00  3-7 days
30 SMLS API 5L / ASTM A106  GR.B 4” 114.3 5.5 6-6.1m 14.76  1356  20.00  3-7 days
31 SMLS API 5L / ASTM A106  GR.B 5” 141.3 6.55 6-6.1m 21.77  1856  40.00  3-7 days
32 SMLS API 5L / ASTM A106  GR.B 6” 168.3 6 6-6.1m 24.02  167  4.00  3-7 days
33 SMLS API 5L / ASTM A106  GR.B 6” 168.3 7.11 6-6.1m 28.26  708  20.00  3-7 days
34 SMLS API 5L / ASTM A106  GR.B 6” 168.3 10 6-6.1m 39.04  514  20.00  3-7 days
35 SMLS API 5L / ASTM A106  GR.B 8” 219.1 8.8 6-6.1m 45.64  440  20.00  3-7 days
                291057  1139.84   
 
1. -Packing : With PE/BE ends + end cover, can do black/galvanized/3pe/epoxy coating. Pipes length is 6-6.1 meters per piece. 
2. – All docs & certifications can be matched with your request .
3. – The pipes can be ready for loading within 5 -7 days (exclude coating time).
 
Seamless Pictrures :

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Reducing elbow inquiry : ASTM A234 GR.WPB,ASME B16.9, 90-LONG http://www.abtersteel.com/clients-and-cases/customer-enquiry/reducing-elbow-inquiry-astm-a234-gr-wpbasme-b16-9-90-long/ Tue, 16 Oct 2018 13:05:07 +0000 http://www.abtersteel.com/?p=4413 inquiry of reducing elbow Hello, my name is Kazumi Hagimori at China & Marine Industries Ltd. We are looking for a supplier who can provide the following item. Item : R-ELBOW,ASTM A234 GR.WPB,ASME B16.9, 90-LONG,NPS 6×4,STD WALL THICKNESS Qty : 1pc If you can supply, will you give us your quotation for price and delivery time? Waiting for your prompt reply. Sincerely K. Hagimori ***************************************************** Kazumi Hagimori The China & Japan Marine Industries Limited Overseas Sales Division 4-12-3 Shimoyamate-dori Chuo-ku Kobe Hyogo 650-0011 Japan TEL: 81-78-391-4394 FAX: 81-78-393-2901 E-mail: hagimori@sai-g.co.jp *****************************************************

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inquiry of reducing elbow

Hello, my name is Kazumi Hagimori at China & Marine Industries Ltd.

We are looking for a supplier who can provide the following item.

Item : R-ELBOW,ASTM A234 GR.WPB,ASME B16.9, 90-LONG,NPS 6×4,STD WALL THICKNESS

Qty : 1pc

If you can supply, will you give us your quotation for price and delivery time?

Waiting for your prompt reply.

Sincerely

K. Hagimori

*****************************************************
Kazumi Hagimori
The China & Japan Marine Industries Limited
Overseas Sales Division

4-12-3 Shimoyamate-dori Chuo-ku Kobe

Hyogo 650-0011 Japan
TEL: 81-78-391-4394 FAX: 81-78-393-2901
E-mail: hagimori@sai-g.co.jp
*****************************************************

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BOILER TUBE TO A210 GR. A1, SIZE: 38.1MM OD X 3.2MM THICK Enquiry http://www.abtersteel.com/clients-and-cases/customer-enquiry/boiler-tube-to-a210-gr-a1-size-38-1mm-od-x-3-2mm-thick-enquiry/ Tue, 16 Oct 2018 12:59:31 +0000 http://www.abtersteel.com/?p=4410 Subject: BOILER TUBE TO A210 GR. A1, SIZE: 38.1MM OD X 3.2MM THICK – TECSOL/040303 Kind Attn.: Sales Department Dear Sir We have requirements for the following item, S# Item Detail UOM Qty Brand/Origin Unit Price Net Price 1 BOILER TUBE TO A210 GR. A1, SIZE: 38.1MM OD X 3.2MM THICK (OR NEAREST SIZE) MTR 24       We are looking for your earliest quotation. Please send your offer soon. Regards Gopi Sales Engineer. TecSol International LLC, P O Box 113603, Dubai, UAE TecSol ElectroMechanical Contracting, Box 15422, Ajman E-mail: mgopi@tecsol-me.com ; TecSolDubai@eim.ae Web Site : www.tecsol-me.com

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Subject: BOILER TUBE TO A210 GR. A1, SIZE: 38.1MM OD X 3.2MM THICK – TECSOL/040303

Kind Attn.: Sales Department

Dear Sir

We have requirements for the following item,

S#

Item Detail

UOM

Qty

Brand/Origin

Unit Price

Net Price

1

BOILER TUBE TO A210 GR. A1,

SIZE: 38.1MM OD X 3.2MM THICK (OR NEAREST SIZE)

MTR

24

 

 

 

We are looking for your earliest quotation. Please send your offer soon.

Regards

  1. Gopi
    Sales Engineer.
    TecSol International LLC, P O Box 113603, Dubai, UAE
    TecSol ElectroMechanical Contracting, Box 15422, Ajman
    E-mail: mgopi@tecsol-me.com ; TecSolDubai@eim.ae
  2. Web Site : www.tecsol-me.com

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30 Inch Lsaw API 5L, Grade X 46, 3LPE Coated Steel Line Pipe – ENQUIRY http://www.abtersteel.com/clients-and-cases/customer-enquiry/30-inch-lsaw-api-5l-grade-x-46-3lpe-coated-steel-line-pipe-enquiry/ Tue, 16 Oct 2018 12:56:51 +0000 http://www.abtersteel.com/?p=4408 Dear Sir This is Mya Thanda from RedLink Communications Co., Ltd. I am handling Oil Well Drilling Operation Projects in Oil and Gas Sector. First of all, I would like to introduce about our company that we, Red Link Communications Co., Ltd, Myanmar is a leading business in Telecommunications, Broadcasting and Trading Sector. We supply various telecom equipment and systems to ISPs, corporates, NGOs, enterprises and many government departments. We supply broadcasting transmitters and studio  equipment to national broadcasters.   Moreover, Material Supply for Oil Well Drilling Operation Projects in Oil and Gas Sector is a one of our activities. We also provide goods […]

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Dear Sir

This is Mya Thanda from RedLink Communications Co., Ltd. I am handling Oil Well Drilling Operation Projects in Oil and Gas Sector.

First of all, I would like to introduce about our company that we, Red Link Communications Co., Ltd, Myanmar is a leading business in Telecommunications, Broadcasting and Trading Sector. We supply various telecom equipment and systems to ISPs, corporates, NGOs, enterprises and many government departments. We supply broadcasting transmitters and studio  equipment to national broadcasters.  

Moreover, Material Supply for Oil Well Drilling Operation Projects in Oil and Gas Sector is a one of our activities. We also provide goods and services for  Special Projects, ISP Projects in IT sector , Transmission Line and Substation Projects in Power and Electrical Sector and Communication and Navigation Equipment  and Shipyard Project in Marine Sector. 

Now firstly, we have to supply 30 Inch Lsaw API 5L, Grade X 46, 3LPE Coated Steel Line Pipe (5) Miles to our client before (15.3.14). If you do not mind I would like to request you to provide me the price quotation, relevant specifications and certificate of these items. I attach with detail specifications. Please also provide me the following information.

1.      Payment term:  with CIF (Yangon) if possible
2.      Delivery time
3.      Name of port of loading
4.      Price validity
5.      Warranty
6.      Country origin
7.      Manufacturer Name
8.      Brand Name
9.      API Certificate

Hopefully, I will be expecting appreciative response from you.

Best Regards,

Mya Thanda
Assistant Manager
Business Department
RedLink Communications Co.,Ltd

Building 16, #2-01, Myanmar ICT Park, Universities’ Hlaing Campus,Hlaing Township, Yangon, Myanmar 701. Tel: + 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871+ 95 1 654871~5, 521289~90   Fax: + 95 1 654870

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Tubos A335 Gr. P91 http://www.abtersteel.com/clients-and-cases/customer-enquiry/tubos-a335-gr-p91/ Tue, 16 Oct 2018 12:53:59 +0000 http://www.abtersteel.com/?p=4406   Assunto: pedido de cotação -Tubos A335 Gr. P91        Para: gustavo.faneca@tubexpress.com.br Caros, Solicitamos urgente, seu melhor preço e demais condições comerciais, para: 78 mt – Tubo de condução  AL ASTM A335 Gr. P91, sem costura, ASME B36.10M, PC- 16” SCH 120 54 mt – Tubo de condução  AL ASTM A335 Gr. P91, sem costura, ASME B36.10M, PC.- 18” SCH 120 Marcelo Salomão.    TFI DO BRASIL tel(21)2583-9255

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  Assunto: pedido de cotação -Tubos A335 Gr. P91
       Para: gustavo.faneca@tubexpress.com.br
Caros,
Solicitamos urgente, seu melhor preço e demais condições comerciais, para:

78 mt – Tubo de condução  AL ASTM A335 Gr. P91, sem costura, ASME
B36.10M, PC- 16” SCH 120

54 mt – Tubo de condução  AL ASTM A335 Gr. P91, sem costura, ASME
B36.10M, PC.- 18” SCH 120

Marcelo Salomão.
   TFI DO BRASIL
tel(21)2583-9255

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seamless steel pipe VS welded steel pipe http://www.abtersteel.com/knowledge/seamless-steel-pipe-vs-welded-steel-pipe/ Wed, 10 Oct 2018 02:07:39 +0000 http://www.abtersteel.com/?p=4400 The difference between seamless steel pipe and welded steel pipe   The seamless steel pipe is made of round billet by hot rolling, cold rolling or cold drawing, and the pipe body is seamless. The welded steel pipe is made of flat steel plate and welded on the pipe body. Including ERW pipeline, LSAW pipeline, SSAW pipeline. ABTERSTEEL tells you the differences in raw materials, manufacturing processes, performance, appearance, dimensions, applications, cost prices, etc. for seamless and welded tubes. How to make seamless steel pipes. API 5L and ASTM seamless steel tubes are passed through a porous tube using steel […]

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The difference between seamless steel pipe and welded steel pipe
 
The seamless steel pipe is made of round billet by hot rolling, cold rolling or cold drawing, and the pipe body is seamless.
The welded steel pipe is made of flat steel plate and welded on the pipe body. Including ERW pipeline, LSAW pipeline, SSAW pipeline.

ABTERSTEEL tells you the differences in raw materials, manufacturing processes, performance, appearance, dimensions, applications, cost prices, etc. for seamless and welded tubes.

How to make seamless steel pipes.

API 5L and ASTM seamless steel tubes are passed through a porous tube using steel ingots or solid tubes as raw materials, which can then be hot rolled, cold rolled or cold drawn. Hot-rolled seamless steel tubes are made from steel billet forging, perforating, rolling, forming and other processes. For large diameter pipes and thick wall seamless pipes that are usually manufactured in this way. The cold drawn seamless pipe adopts cold drawing forming technology. The material is low in strength and has a smooth appearance and internal control surface. Small diameter and thin wall seamless tubes are typically manufactured in this manner. The seamless steel pipe is rolled from carbon structural steel, low alloy structural steel or alloy structural steel and stainless steel. Seamless steel pipes for different industries: pipeline piping, thermal services, machinery industry,

How is welded steel pipe manufactured?

API 5L or ASTM welded steel tubes include LSAW tubes, SSAW tubes and ERW tubes. These pipes are made of steel strip or steel. The manufacturing process first bends the steel sheet and then welds it into a circle, square and other shapes. Welded steel pipes have the characteristics of high production efficiency, low cost and material saving. It has been widely used in aviation, aerospace, energy, electronics, automotive, light industry and other industries. It has strong corrosion resistance in an acidic environment.

Why should you choose to buy seamless steel pipes?

The reason most people like to weld seamless steel tubes is that seamless tubes can withstand extremely high pressures without cracking. However, welds or welded pipes cannot do this because the welds are prone to cracking under high pressure. In addition, it is very easy to accurately calculate the pressure of the seamless pipe. Seamless tubes are thinner and lighter than welded tubes, and they are also uniform in shape due to the uniform extrusion of the alloy. If you want to buy the best quality seamless steel pipe, you should use the Bay Steel API 5L and ASTM seamless steel pipe.

Summary of differences in seamless butt welded steel pipes

There are some differences between API 5L / ASTM seamless steel tubes and ERW welded steel tubes as follows:

1. Appearance difference

Seamless steel tubes use steel billets as raw materials. The outer surface defects of the billet cannot be eliminated by the hot rolling process and are only polished after the product is completed. In the process of wall reduction, defects can only be partially eliminated.

The welded steel pipe with hot rolled coil as raw material has the surface quality of the coil as the surface quality of the pipe and is easy to control. The hot rolled coil has a high surface quality.

Therefore, the surface quality of welded steel pipes is much better than that of seamless steel pipes.

2. Molding process differences

A seamless steel pipe can be formed once during the rolling process.
Welded steel pipes are made of steel or steel, by bending and different welding processes.

3. Performance and use

Seamless steel tubes have better pressure bearing capacity and higher strength than ERW welded steel tubes. Therefore, it is widely used in high-voltage equipment, thermal engineering, boilers and other industries.
Generally, welds of welded steel pipes are disadvantages, and quality affects overall performance.

In general, the working pressure of welded steel pipes is 20% lower than that of seamless steel pipes. This reliability is a major factor in the choice of seamless steel tubes. In fact, all industrial pipes are made with seamless pipes, simply because the pipes are subjected to extreme thermal, chemical and mechanical workloads. Welded pipes are more popular in the relatively low-cost aerospace, automotive and electronics industries, as are the working pressures imposed on the pipeline.

4. Available size differences

For most seamless steel tube manufacturers in China, they produce original seamless steel tubes with a maximum outer diameter of 20 inches and 508 mm. Due to equipment limitations, it is typically less than 16 inches, or 406.4 mm. If the customer wants to purchase a seamless steel pipe of more than the above size, thermal expansion processing should be used. But usually the quality of this thermally expanded seamless steel tube is incomparable with the original seamless steel pipe.
In contrast, welded steel pipes do not have these limitations and can range in size from 1-1 / 2 inches 48.3 mm to 100 inches 2540 mm.

5. Cost and price

Due to raw materials, manufacturing equipment and processes, the cost of seamless steel pipes is generally higher than that of welded steel pipes. But sometimes due to market pressure, welded pipes are more expensive, so if you encounter this situation, don’t hesitate to buy seamless steel pipes of the same size.

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DIN17175 seamless Heat Exchanger Tubes http://www.abtersteel.com/seamless-steel-pipe/din17175-seamless-heat-exchanger-tubes/ Wed, 10 Oct 2018 01:56:41 +0000 http://www.abtersteel.com/?p=4399 DIN 17175 seamless steel pipe is used in boiler installations, high-pressure pipelines and tank construction and special machinery for both high temperature and high-pressure devices. And it is widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automobile transmission shaft, self frame as well as the construction of the steel scaffolding. Steel Grade: St37, St44, St45, St52, 15Mo3, 13CrMo44, 10CrMo910, 14MoV63, Standard Grade Chemical Composition C Si Mn P≤ S≤ Cr Mo DIN17175 St35.8 ≤ 0.17 0.10~0.35 0.40~0.80 0.030 0.030 / / St45.8 ≤ 0.21 0.10~0.35 0.40~1.20 0.030 0.030 / / 15Mo3 0.12~0.20 0.10~0.35 0.40~0.80 0.030 0.030 / 0.25~0.35   […]

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DIN 17175 seamless steel pipe is used in boiler installations, high-pressure pipelines and tank construction and special machinery for both high temperature and high-pressure devices. And it is widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automobile transmission shaft, self frame as well as the construction of the steel scaffolding.

Steel Grade: St37, St44, St45, St52, 15Mo3, 13CrMo44, 10CrMo910, 14MoV63,

Standard

Grade

Chemical Composition

C

Si

Mn

P≤

S≤

Cr

Mo

DIN17175

St35.8

≤ 0.17

0.10~0.35

0.40~0.80

0.030

0.030

/

/

St45.8

≤ 0.21

0.10~0.35

0.40~1.20

0.030

0.030

/

/

15Mo3

0.12~0.20

0.10~0.35

0.40~0.80

0.030

0.030

/

0.25~0.35

 

Standard

Grade

Tensile Strength (MPa)

Yield Strength (MPa)

Elongation (%)

DIN17175

St35.8

360~480

≥ 235

≥ 25

St45.8

410~530

≥ 255

≥ 21

15Mo3

460~600

≥ 270

≥ 20

Cold finished OD. Range: 8mm – 114.3mm, wall thickness: 1mm-20mm
Hot rolled OD. Range: 114.3mm – 720mm, wall thickness: 5mm-120mm
Length: Max length 12M
Port Form: PE BE

1. Professional steel pipe manufacturer over 10 years.
2. Quality: produce according to the given standard such as: ASTM SAME, DIN, EN, JIS, GOST.
3. Inspection: Third party inspection or customer of inspection both ok, such as SGS, BV.
4. Prompt feedback: all your emails and questions would be replied within 1 working hours.
5. Flexible payment terms: T/T, L/C and so on.

Carbon Steel Heat Exchanger Tubes , DIN17175 Steam Boiler  Carbon Steel Heat Exchanger Tubes , DIN17175 Steam Boiler Seamless Steel Tubes Heat exchanger tubes ex stock Cold drawn seamless heat exchanger tubes Seamless Steam Boiler Steel Tubes DIN17175 Pressure Vessels and Boilers

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Seamless Steel Pipe for vessels, equipment, fittings and mechanical structures http://www.abtersteel.com/techinical-info/seamless-steel-pipe-for-vessels-equipment-fittings-and-mechanical-structures/ Thu, 27 Sep 2018 01:48:53 +0000 http://www.abtersteel.com/?p=4395 GB/T8162 – China National Standard  ASTM  A53 – American Society for Testing and Materials Standard ASME SA53 – American Boiler and Pressure Vessel Code Uses: for the manufacture of seamless pipes for pipes, containers, equipment, pipe fittings and mechanical structures Mainly produced steel pipe grades: 10, 20, 35, 45, Q345, 15CrMo, 12Cr1MoV, A53A, A53B, SA53A, SA53B, etc. Dimensional tolerances: Steel pipe type Outer diameter (D) Steel pipe wall thickness (S) Cold drawn tube Steel pipe outer diameter (mm) Allowable deviation (mm) Steel pipe wall thickness (mm) Allowable deviation (mm) >30~50 ±0.3 ≤30 ±10% >50~219 ±0.8% Hot rolled tube >219 ±1.0% >20 ±10%   Mechanical […]

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GB/T8162 – China National Standard 
ASTM  A53 – American Society for Testing and Materials Standard ASME SA53 – American Boiler and Pressure Vessel Code

Uses: for the manufacture of seamless pipes for pipes, containers, equipment, pipe fittings and mechanical structures

Mainly produced steel pipe grades: 10, 20, 35, 45, Q345, 15CrMo, 12Cr1MoV, A53A, A53B, SA53A, SA53B, etc.

Dimensional tolerances:

Steel pipe type

Outer diameter (D)

Steel pipe wall thickness (S)

Cold drawn tube

Steel pipe outer diameter (mm)

Allowable deviation (mm)

Steel pipe wall thickness (mm)

Allowable deviation (mm)

>30~50

±0.3

≤30

±10%

>50~219

±0.8%

Hot rolled tube

>219

±1.0%

>20

±10%

 

Mechanical properties:

 

standard

Brand

Tensile strength (MPa)

Yield strength (MPa)

Elongation(%)

GB/T8162

10

≥335

≥205

≥24

20

≥390

≥245

≥20

35

≥510

≥305

≥17

45

≥590

≥335

≥14

Q345

≥490

≥325

≥21

15CrMo

≥440

≥295

≥22

12Cr1MoV

≥490

≥245

≥22

ASTM A53

ASME SA53

A

≥330

≥205

View the table of ASTM A53

View the table of ASME SA53

B

≥415

≥240

 

chemical composition:

standard

Brand

chemical composition(%)

C

Si

Mn

P

S

With

Ni

Mo

Cr

V

GB/T8162

10

0.07~0.14

0.17~0.37

0.35~0.65

≤0.035

≤0.035

≤0.25

≤0.25

/

≤0.15

/

20

0.17~0.24

0.17~0.37

0.35~0.65

≤0.035

≤0.035

≤0.25

≤0.25

/

≤0.25

/

35

0.32~0.40

0.17~0.37

0.50~0.80

≤0.035

≤0.035

≤0.25

≤0.25

/

≤0.25

/

45

0.42~0.50

0.17~0.37

0.50~0.80

≤0.035

≤0.035

≤0.25

≤0.25

/

≤0.25

/

Q345

0.12~0.20

0.20 to 0.55

1.20~1.60

≤0.035

≤0.035

≤0.25

≤0.25

/

≤0.25

/

15CrMo

0.12~0.18

0.17~0.37

0.40~0.70

≤0.035

≤0.035

≤0.25

≤0.30

0.40~0.55

0.80~1.10

/

12Cr1MoV

0.08~0.15

0.17~0.37

0.40~0.70

≤0.035

≤0.035

≤0.25

≤0.30

0.25~0.35

0.90~1.20

0.15~0.30

ASTMA53

ASMESA53

A

≤0.25

/

≤0.95

≤0.05

≤0.06

≤0.40

≤0.40

≤0.15

≤0.40

≤0.08

B

≤0.30

/

≤1.20

≤0.05

≤0.06

≤0.40

≤0.40

≤0.15

≤0.40

≤0.08

 

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How to calculate the pressure capacity of seamless steel pipe http://www.abtersteel.com/techinical-info/how-to-calculate-the-pressure-capacity-of-seamless-steel-pipe/ Thu, 27 Sep 2018 01:44:07 +0000 http://www.abtersteel.com/?p=4392 Seamless steel pipe calculate the pressure capacity The calculation method of the pressure bearing capacity of the seamless steel pipe is as follows. Let us choose a practical case to explain: DN=10MM, wall thickness is 3mm Let the tensile strength of the material be σ, the pressure be P, the outer diameter of the pipe D; the  wall thickness of the pipe δ=(P*D)/(2*σ/S)  where S is the safety factor; Because P is less than 7 MPa, S is selected as S=8; P is less than 17.5 MPa, S is selected as S=6; P is greater than 17.5 MPa, S is selected as […]

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Seamless steel pipe calculate the pressure capacity

The calculation method of the pressure bearing capacity of the seamless steel pipe is as follows. Let us choose a practical case to explain:

DN=10MM, wall thickness is 3mm

Let the tensile strength of the material be σ, the pressure be P, the outer diameter of the pipe D; the 
wall thickness of the pipe δ=(P*D)/(2*σ/S) 
where S is the safety factor;

Because P is less than 7 MPa, S is selected as S=8; P is less than 17.5 MPa, S is selected as S=6; P is greater than 17.5 MPa, S is selected as S=4; 
we choose safety factor S=6; and 20 steel tensile strength is 410 MPa ,

Therefore, the pressure that the pipe can withstand P=(2*σ/S*δ)/D 
                   =(2*410/6*3)/(10+6) 
                   =26.25MPa>Set the 17.5, 
so the safety factor is S=4

Therefore, the pressure that the pipe can withstand P=(2*σ/S*δ)/D 
                   =(2*410/4*3)/(10+6) 
                   =39.375MPa

According to this formula, you can easily calculate the pressure bearing capacity of seamless steel pipes of various specifications.

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Protective coating for petroleum pipe http://www.abtersteel.com/knowledge/protective-coating-for-petroleum-pipe/ Wed, 12 Sep 2018 02:30:57 +0000 http://www.abtersteel.com/?p=4387 Protective coating for petroleum pipe and preparation method and construction method thereof   [57] Abstract The invention provides a protective coating for oil pipes and wellheads and downhole equipment used in oil and gas drilling, oil recovery and transportation. The protective coating comprises, by weight percentage, 55 to 95% of polyphenylene sulfide, 3 to 30% of adhesion enhancer, and 1 to 20% of abrasion resistant enhancer. A surface wettability converting agent may also be included in the range of 1 to 15%. It can prevent or reduce the high temperature, high pressure, high hydrogen sulfide and carbon dioxide, high salt content and other strong […]

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Protective coating for petroleum pipe and preparation method and construction method thereof 

 [57] Abstract

The invention provides a protective coating for oil pipes and wellheads and downhole equipment used in oil and gas drilling, oil recovery and transportation. The protective coating comprises, by weight percentage, 55 to 95% of polyphenylene sulfide, 3 to 30% of adhesion enhancer, and 1 to 20% of abrasion resistant enhancer. A surface wettability converting agent may also be included in the range of 1 to 15%. It can prevent or reduce the high temperature, high pressure, high hydrogen sulfide and carbon dioxide, high salt content and other strong corrosive media on the erosion, corrosion and waxing, scaling and hydrate blockage, reduce friction and reduce production costs. Improve the overall performance and service life of oil pipes. The present invention also provides a method of preparing such a protective coating and a method of constructing the same.

1. Protective coating for petroleum pipes, characterized in that the weight percentage comprises the following components:

55~95%, 3~30%,

1 to 20%.

Polyphenylene sulfide adhesion enhancer

2. The protective coating for petroleum pipes according to claim 1, wherein the adhesion enhancer is at least one of micron or nanometer titanium dioxide, chromium trioxide, cobalt sulphate, and carbon fiber. The wear-resistant enhancer is at least one of micron or nano-sized aluminum oxide, copper sulfide, silicon carbide, molybdenum disulfide, carbon fiber, and silicon dioxide.

A protective coating for petroleum pipes according to claim 1 or 2, which comprises the following components in percentage by weight:

Polyphenylene sulfide 55~95%,

Adhesion enhancer 3~30%,

Wear-resistant enhancer 1~20%,

Surface wettability conversion agent 1~15%.

A protective coating for petroleum pipes according to claim 3, wherein the surface wettability converter is at least one of fluorine tetrahexa, polytetrafluoroethylene, polyvinyl alcohol, and molybdenum disulfide.

5. A protective coating for petroleum pipes according to claim 3, characterized in that the following components are included by weight:

Polyphenylene sulfide 55~95%,

Adhesion enhancer 3~30%,

Wear-resistant enhancer 1~20%,

Surface wettability conversion agent 1~15%,

Surface leveling agent 0• 5~5%.

A protective coating for petroleum pipes according to claim 5, wherein the surface leveling agent is at least one of titanium oxide, silane, and octyl acrylate copolymer of the order of micrometers or nanometers.

A protective coating for petroleum pipes according to claim 1 or 2, characterized in that the following components are included in percentage by weight:

Polyphenylene sulfide 55~95%,

Adhesion enhancer 3~30%,

Wear-resistant enhancer 1~20%,

Surface leveling agent 0. 5~5%.

A protective coating for petroleum pipes according to claim 7, wherein the surface leveling agent is at least one of micron- or nano-sized titanium dioxide, silane, and octyl acrylate copolymer.

9. A method for preparing a protective coating for a petroleum pipe, characterized in that the method comprises ball-milling polyphenylene sulfide powder with other components and ethanol of 3 to 5 times the weight of polyphenylene sulfide in a ball mill, time For 4~24 hours, after ball milling, the particle size is controlled at 0.074~0.096 mm, and the suspension of protective coating is prepared for use; then the suspension is dried at 11 CTC ~ 160 ° C for 4-6 hours, ie A dry powder of protective coating is obtained.

10. A method of constructing a protective coating for a petroleum pipe, characterized in that the method comprises the following steps:

1), the surface of the workpiece is pretreated: the cover on the surface of the workpiece is removed;

2), spraying with high pressure airless spraying or electrostatic powder spraying process;

) High pressure airless spraying with a suspension of protective coating: spraying on the workpiece in a high pressure and airless manner or spraying the bottom layer, the top layer and/or the intermediate layer on the workpiece: first spraying the bottom layer on the workpiece, the spraying ends after the workpiece into [deg.] 60~80 oven for 20 to 30 minutes of pre-baked in full removal of solvent the bottom, and then into the plasticized workpiece plasticizing furnace, plasticizing temperature is [deg.] 300~350 , The plasticizing time is 15~60 minutes; the thermal spraying process is adopted for the middle layer and the surface layer, that is, the workpiece is taken out from the plasticizing furnace, and the upper layer or the surface layer is quickly sprayed, respectively, and then plasticized in a plasticizing furnace. The plasticizing temperature is 320 ° ~ 400 ° , the plasticizing time is 30 ~ 120 minutes, and finally the plasticized workpiece coated with the surface layer is taken out of the furnace and immediately placed in water to be cooled and quenched;

), using dry powder of protective coating on the workpiece once or on the bottom layer, the surface layer and / or the intermediate layer for electrostatic powder coating. • Is the use of high-voltage electric field effect, the coating powder is negatively charged, the workpiece is grounded, so that the paint is absorbed into the workpiece On the surface, the workpiece is attached with powder coating and then sent to the plasticizing furnace. The powder is melted by heat and leveled and solidified into a film. The thickness of the bottom layer is 30~100^〇1, and the plasticizing temperature is 300!:~350°(: The plasticizing time is 15~60 minutes, the plasticizing temperature of the middle layer or the surface layer is 320° ~400° , the plasticizing time is 30 120 minutes, and finally the plasticized workpiece is quickly taken out from the furnace. Put in water to cool and quench.

Protective coating for petroleum pipe, preparation method and construction method thereof

Technical field:

The invention relates to a petroleum pipe used in oil and gas drilling, oil recovery and transportation, a protective coating for a wellhead and a downhole equipment, a preparation method thereof and a construction method.

Background technique:

Oil pipes include drill pipes, tubing, casing and oil and gas pipelines and sucker rods. Downhole and wellhead equipment includes wellhead high pressure control systems, station equipment and downhole pumps and packers. The working environment of oil pipelines and wellheads and downhole equipment is very harsh (such as oil and gas wells may be as high as 180 ° , pressures may be as high as 100 MPa , high concentrations of hydrogen sulfide and carbon dioxide, high chloride content and other highly corrosive media), and their service life and Performance has seriously affected exploration and development and oil and gas field operations. For sulfur-containing gas fields, it may cause environmental problems and major safety accidents.

At present, the methods used in the protection of petroleum pipelines are mainly: stainless steel pipes are used in harsh corrosive environments, but stainless steel is expensive, and its use conditions are also limited. It is necessary to adapt to the temperature, carbon dioxide, hydrogen sulfide and chloride content. Steel type. For oil and gas wells with temperatures below 100 ° , epoxy phenolic series coatings or linings are mainly used at home and abroad. The main problem with these coatings is temperature sensitivity, and their overall performance is reduced at temperatures above 100 ° C. The applicant entrusted the authoritative organization of China’s petroleum industry to conduct high-temperature and high-pressure harsh environmental corrosion evaluation test (the test standard adopts the American Society of Corrosion Engineers Standard NACE TM 0185-93 “Test Method for Autoclave Evaluation of Tube Plastic Internal Coating Anticorrosion”), and found the above. The coating is soaked in a harsh corrosive environment of the oil pipe (ie, high temperature (140 ° ), high pressure (35 MPa ), high hydrogen sulfide and carbon dioxide, high chloride content, high salt content and other strong corrosive media) The coating is bubbling and delaminating. Analysis of the reason found that: when implemented by the method described above, the adhesion of the coating to the petroleum pipe matrix is ​​poor, and the coating becomes brittle. When the temperature is higher than 14 ( TC) , the reliability of the overall performance is lowered, and the range of use is limited.

Chinese Patent Application Publication No. 1100124 “High-temperature anti-stick anti-corrosion coating” discloses a coating based on polyphenylene sulfide, which can be used in a rubber mold and a reaction kettle, and has a certain non-stickiness. China Patent Application Publication No. 1100123 “Abrasion Resistant Coating” discloses a wear-resistant anti-wear coating which has good thermal stability, chemical resistance, mechanical properties, adhesion, self-lubricity and resistance. Grindability can be applied to parts of various mechanical products in mining, metallurgy, building materials, energy, agricultural machinery, transportation and other departments. in

National Patent Application Publication No. 1133331 “Polyphenylene sulfide resin anticorrosive coating” discloses a polyphenylene sulfide resin anticorrosive coating for use in a coal tar kettle of a coking plant, which is used for spraying on carbon due to acid and alkali resistance. On the inner surface of the coal tar kettle made of steel plate, plasticized to form a protective layer to meet the process requirements of the kettle. China Patent Application Publication No. 1 253 979 “A heat-resistant, acid-resistant coating for the surface of a metal material” discloses a heat-resistant and acid-resistant coating for the surface of a metal material, and the metal material treated by the invention is at a high temperature and a high concentration. Sulfuric acid has good corrosion resistance in the harsh environment.

At present, the anti-corrosion coatings for petroleum pipes (sweat, oil pipes, etc.) of China’s petroleum industry are mainly imported, and the coatings are epoxy phenolic.

Summary of the invention:

The object of the present invention is to provide a method for preventing or reducing high temperature, high pressure, high hydrogen sulfide and carbon dioxide, high salt and other strong corrosive media to corrode and wax, scale and hydrate the pipeline, and improve the oil pipe. Anti-corrosion, anti-wear, anti-erosion, anti-foling, anti-fouling, anti-friction, reduce production costs, improve the overall performance and service life of oil pipes, protective coatings for oil pipes and wellheads or downhole equipment . Another object of the invention is to provide a process for the preparation of such protective coatings. Still another object of the present invention is to provide a method of construction of such a protective coating.

The object of the invention is achieved in this way:

The protective coating for petroleum pipes of the present invention is characterized by comprising the following components in percentage by weight:

Polyphenylene sulfide 55~95%,

Adhesion enhancer 3~30%,

Wear-resistant enhancer 1~20%.

The above adhesion enhancer is at least one of micron or nanometer titanium dioxide ( Ti 2 ), chromium oxide ( Cr 2 0,), cobalt oxychloride ( 2 0 3 ), carbon fiber, and is resistant to The abrasive enhancer is at least micron or nanometer aluminum oxide ( 2 0 3 ), copper sulfide ( CuS ), silicon carbide ( SiC ), molybdenum disulfide ( MoS 2 ), carbon fiber, silica Alternatively, other adhesion enhancers or abrasion enhancers may be employed.

The above protective coatings include the following components by weight.

Polyphenylene sulfide

55~95%,

Adhesion enhancer

3 to 30%,

Wear-resistant enhancer

1 to 20%,

Surface wettability converter

1 to 15%.

The above surface wettability conversion agent is at least one of fluorine tetrahexene ( #), polytetrafluoroethylene, polyvinyl alcohol, molybdenum disulfide (  S 2 ), and other surface wettability conversion may be employed. Agent.

The above protective coatings include the following components by weight:

Polyphenylene sulfide

55~95%,

Adhesion enhancer

3 to 30%,

Wear-resistant enhancer

Bu 20%,

Surface wettability converter

1 to 15%,

Surface leveling agent

0. 5~5%.

The above surface leveling agent is at least one of micron or nanometer titanium dioxide, silane, and octyl acrylate copolymer, and other surface leveling agents may also be used.

The above protective coatings include the following components by weight:

Polyphenylene sulfide 55~95%,

Adhesion enhancer 3~30%,

Wear-resistant enhancer 1~20%,

Surface leveling agent 0.5~5%.

The above surface leveling agent is at least micron or nanometer titanium dioxide, silane, octyl acrylate copolymer

One of them.

The protective coating for petroleum pipeline of the present invention is prepared by putting a polyphenylene sulfide powder and other components and ethanol of 3 to 5 times the weight of polyphenylene sulfide into a ball mill for ball milling for 4 to 24 hours. After ball milling, the particle size is controlled to be 0.074~0.096 mm, and the suspension of the protective coating is prepared for use; and the suspension is dried at a temperature of HTC to 160 ° for 4 to 6 hours to obtain a dry powder of the protective coating.

The method for constructing a protective coating for petroleum pipes of the present invention comprises the following steps:

1), the surface of the workpiece is pretreated: the cover on the surface of the workpiece is removed;

2), spraying with high pressure airless spraying process or electrostatic powder spraying process;

), using a protective coating suspension for high-pressure airless spraying: spraying on the workpiece in a high-pressure airless manner or spraying the bottom layer, the surface layer and/or the intermediate layer on the workpiece; first spraying the bottom layer on the workpiece/after spraying , [deg.] the workpiece into 60~80 oven for 20 to 30 minutes in the prebaking, the solvent is removed fully underlying the workpiece is then fed into the furnace plasticized plasticized, [deg.] plasticizing temperature of 300~350 , plastic The time is 15~60 minutes; the middle layer and the surface layer are all sprayed by thermal spraying process, that is, the workpiece is taken out from the plasticizing furnace, and the upper layer or the surface layer is quickly sprayed separately, and then plasticized in a plasticizing furnace, plasticized The temperature is 320 ° ~ 400 ° , the plasticizing time is 30 ~ 120 minutes. Finally, the plasticized workpiece coated with the surface layer is taken out from the furnace and then rapidly quenched by water cooling, spraying the middle layer or the surface layer. The number of times depends on the thickness of the coating required for corrosion protection;

), using protective coating dry powder on the workpiece once or in the bottom layer, the surface layer and / or the intermediate layer for electrostatic powder coating; using the high-voltage electric field induction effect, the coating powder is negatively charged, the workpiece is grounded, so that the coating powder is adsorbed onto the surface of the workpiece, The workpiece is attached with powder coating and then sent to the plasticizing furnace. The powder is melted by heat and leveled and solidified into a film. The thickness of the bottom layer is 30 100 nm, the plasticizing temperature is 300 ° ~ 350 ° , and the plasticizing time is 15~ 60 minutes, the plasticizing temperature of the middle layer and the top layer is 320 ° ~ 400 ° , the plasticizing time is 30 120 minutes. Finally, the plasticized workpiece is taken out of the furnace and quickly placed in water to cool and quench. The number of intermediate layers or top layers depends on the thickness of the coating required for corrosion protection.

The invention uses polyphenylene sulfide as a base material to improve the protection performance of the oil pipe by adding certain modified materials. The most commonly used modifier is titanium dioxide, which smoothes the surface of the coating, reduces pinholes, and improves adhesion. The addition of graphite improves the lubricity of the coating. Adding Cr 2 0 P Co 2 0 : i MoSy and other cobalt or molybdenum sulfide or oxide can color the coating, can also promote plasticization, improve the adhesion and mechanical properties of the coating, and increase the hardness of the coating itself. , wear resistance, reduce the friction coefficient of the surface, the corrosion resistance of the coating is good, and the comprehensive performance of the coating under high temperature and high pressure conditions is enhanced. The addition of carbon fiber greatly improves its wear and abrasion resistance. The simultaneous addition of carbon fiber and  S 2 has a synergistic effect, which can greatly enhance the wear resistance of the coating. Add fluorotetracycline, polytetrafluoroethylene, etc. to change the surface energy and wettability of the coating surface, so that crude oil, water and salt can not adhere to the surface of the coating (with eucalyptus and hydrophobicity), to achieve anti-fouling, The purpose of waxing. Silane and octyl acrylate copolymers are also very effective for surface leveling.

The protective coating of the invention is a novel protective coating for petroleum pipes with good thermal stability, corrosion resistance, softness, hardness, gloss, elongation, impact resistance, abrasion resistance, adhesion and self-lubrication, The performance characteristics are as follows:

(1) Good heat resistance. [Deg.] Long-term use temperature of up to 170-200 , ultra high temperature short time [deg.] Up to 270 .

(2) Good chemical resistance. It is resistant to strong corrosion by acids, alkalis, salts and various solvents, and there are no problems such as chloride stress corrosion cracking which is difficult for most stainless steels to withstand.

(3) Compared with the most advanced epoxy phenolic series at home and abroad, the protective coatings of the present invention have higher performances against high temperature, erosion, aging, and harsh environmental corrosion than the epoxy phenolic series coatings commonly used at home and abroad. .

(4) Excellent mechanical properties, good flexibility, impact resistance, wear resistance, and strong adhesion to metal walls. It has been evaluated that the erosion resistance is about 5-10 times higher than that of imported epoxy phenolic paint, which is very suitable for use in natural gas flow corrosion and erosion. The wear resistance is outstanding, and the addition of certain modified materials can greatly improve the wear resistance.

(5) It can be modified to have certain characteristics according to the actual working conditions: low friction resistance, used to reduce the flow resistance in the oil pipe and inside the conveying pipe; high strength and high erosion resistance, used in wellhead equipment; Sex and double sex

(Oyster oil is water-repellent), which can change the surface wettability of the coating, and is good for preventing waxing and scaling. In order to improve the compactness of the coating, the addition of nano-sized modifiers and/or reinforcing agents will make the binding force with polyphenylene sulfide closer, which is beneficial to prevent the penetration of sulfide oxygen. Spraying the coating of the invention on the inner wall of the oil pipeline can reduce the surface of the tube wall

Free energy can reduce the roughness of the surface of the pipe wall, reduce the friction loss, and achieve the purpose of anti-wax, anti-fouling and drag reduction.

(6) Repairability: The leakage point of the coating and the damage occurring during use can be repaired, but the epoxy phenolic paint does not have this feature.

The features of the protective coating of the present invention are:

1. Comprehensive protection of the protective coating of the invention under high temperature and high pressure conditions

(1) Comprehensive protection test equipment and standards adopted

The comprehensive protective performance evaluation of the coating materials was carried out by the American Society of Corrosion Engineers Standard NACE TM0185 – 93 “Test Method for Evaluation of Autoclaves for Tube Plastic Inner Coating Anticorrosion” to evaluate the protective effect of the coating on the metal. The test vessel exposes the workpiece to a corrosive medium environment, and the overall protective performance of the coating under specific environmental conditions is evaluated by changes in the coating and the corrosive medium under high temperature and high pressure conditions.

(2) High temperature and high pressure comprehensive protection test 1

Test conditions: chloride content of 15 X- 10 . 4 PPM the PH = 5.0, test pressure: 34 is ± lMPa , carbon dioxide partial pressure two 3.51 = ^ \ ^^, [deg.] Test temperature of 150 . Test time: 3 hours of heating time, 5 hours of cooling time, and 231 hours of effective experiment time, totaling 239 hours (about 10 days).

Epoxy phenolic coating test results: under the high temperature and high pressure corrosion test conditions of 150 °C , the coating is severely bubbling, and the coating itself is poor in corrosion resistance. Ceramsite series coating test results: almost all of the coating peeled off and became brittle. The test results of the protective coating of the present invention: the coating is intact and not damaged, and has high corrosion resistance and excellent comprehensive protection performance.

(3) High temperature and high pressure comprehensive protection test II

It is basically the same as the above high temperature and high pressure comprehensive protection test. Only the temperature is lowered to 120 ° C, hydrogen sulfide is added, and the partial pressure of hydrogen sulfide P5i tta = 1.6 MPa (5%), test time : 9 days.

Epoxy phenolic coating test results: the coating has no corrosion marks and good performance. Ceramsite series coating test results: there are dense vesicles with slight variations in color. The test result of the protective coating of the invention has no change in the color and gloss of the coating, the interface coating at the metal cutting portion is not damaged, the mechanical cutting portion does not cause the coating to loosen and peel, and the coating has high corrosion resistance and excellent comprehensiveness. Protective performance.

(4) High temperature and high pressure comprehensive protection test III

Test time: 212 hours, pressure: 31~32 MPa , temperature: 100 ° , partial pressure of hydrogen sulfide = 6.5 MPa (5? 4), partial pressure of carbon dioxide Pk seven pull = 3.2 Mpa , content of chloride content 15 10 4 PPM ,  PH = 5.0〇

Test result of protective coating of the invention: the coating is not damaged, has high corrosion resistance and excellent synthesis

Protective performance.

(5) High temperature and high pressure anti-fouling test

The autoclave test was carried out by simulating the corrosion environment in a well. Test time: 168 hours; pressure: 35 MPa ; temperature: 120 ° ; carbon dioxide partial pressure x 7 lM = 3.5 Mpa , chloride content CIT : 10 10 4 PPM ,  PH = 5.5 .

The test result of the protective coating of the invention: the coating was not damaged, the adhesion was good, and the test was successful. The blank sample which was not sprayed with the protective coating of the present invention was very corroded and a layer of calcium carbonate was formed. The test piece using the protective coating of the present invention showed no signs of corrosion and had no calcium carbonate scale on the surface.

(6) Anti-sulfide stress corrosion cracking test

Test Purpose: To test whether the coating will cause microcracking or delamination under the tensile stress condition of 80% steel yield limit. The coating is tested for its resistance to hydrogen sulfide hydrogen embrittlement, i.e., resistance to hydrogen atom penetration. If the coating is broken, the contact of hydrogen sulfide with the steel will quickly cause the sample to break.

Test results: Two tubes of 80 without any treatment were pulled off within 4 hours. The sample using the protective coating of the present invention was not broken for 720 hours. The novel protective coating of the invention has strong anti-hydrogen sulfide hydrogen embrittlement ability and is suitable for the harsh corrosive environment with high hydrogen sulfide and carbon dioxide.

2. Wear resistance

The test standard for falling sand abrasion resistance is SY/T 0315-97. Epoxy phenolic coating falling sand abrasion resistance test result 5.4 um ; ceramsite series coating falling sand abrasion resistance test result 6.2 lim ; protective coating falling sand of the invention abrasion resistance test result 40.0 ym . The protective coating of the invention has high wear resistance and is suitable for gas wells with high erosion resistance.

3. Impact resistance

The impact test standard is SY/T 0315-97. Epoxy phenolic coating impact resistance (1.5 ): pass; ceramsite series coating impact resistance (1.5 ): pass; protective coating of the invention impact resistance (1.5 ): pass.

4. Adhesion

The adhesion test standard was SY/T 0315-97. This protective coating has a adhesion rating of 1.

5. Appearance

Visually, it was found to be uniform in color and smooth.

The protective coating of the present invention is based on polyphenylene sulfide ( PPS ), and various organic or inorganic micro or nano modifiers are added for different applications and performance requirements. The present invention is a thermoplastic material that can be used to repair coating defects or damage points. The invention aims at the actual situation that the oil and gas well waxing and scaling seriously affect the normal production of the oil and gas field, and the protective coating of the invention can change the wettability of the pipe wall to achieve the purpose of preventing waxing, scaling and hydrate blockage.

In the comprehensive performance evaluation experiment, the protective coating of the invention has proved that its resistance to high temperature, corrosion resistance and erosion resistance is much higher than that of epoxy phenolic series, fluorocarbon and the like, which can significantly improve the service life of the oil pipe and performance, long-term working temperature up to ° 170~200 . Compared with protective coatings imported from abroad, the cost of the protective coating of the present invention is greatly reduced.

The preparation method of the protective coating of the invention is simple. The construction method of the protective coating of the invention can coat the petroleum pipe, the oil wellhead or the downhole equipment with the protective coating of the invention to ensure the quality of the coating.

detailed description:

Example 1:

The protective coating of the present invention is composed of the following raw materials by weight:

Polyphenylene sulfide ( PSS ) 65%

Chromium trioxide ( Cr 2 0 3 ) 5%

Titanium dioxide ( Ti 2 ) 15%

Silicon carbide ( SiC ) 14%

Silane 1 %

The above materials are all micron-sized materials.

Main application: high hardness, high wear resistance, smooth surface, no pinholes, used for inner coating of drill pipe, high-yield gas well pipe inner coating.

The preparation method of the protective coating of this embodiment is:

(1) A polyphenylene sulfide powder and the above reinforcing agent and ethanol having a weight of 5 times the weight of polyphenylene sulfide were placed in a ball mill for ball milling.

(2) Using a ceramic ball mill, the ball milling time is 12 hours.

(3) After sieving, the particle size of the powder is less than 0.096 mm , and the suspension of the protective coating is prepared for use.

The construction method of the protective coating of this embodiment is:

1, workpiece surface pretreatment

The coating is removed by removing the paint on the surface of the oil pipe by mechanical sintering, and the rusting is performed by mechanical blasting to increase the bonding strength between the coating and the workpiece, and to improve the overall performance of the coating.

2, high pressure airless spraying, plasticizing process:

The spraying and plasticizing process of the bottom layer:

The bottom layer was sprayed by a high-pressure airless method, and then the workpiece was placed in an oven at 80 ° for 30 minutes, and the solvent in the suspension paint was dried and plasticized. The plasticizing temperature is 320 ° and the plasticizing time is 30 minutes. Spraying and plasticizing process of intermediate layer and surface layer

(1) The middle layer is thermally sprayed. The workpiece was taken out of the furnace, sprayed quickly, and then plasticized at a temperature of 320 ° for 30 minutes.

(2) For the top layer, the plasticizing temperature is 34 ( TC , plasticizing time is 60 minutes. Finally, after the plasticized workpiece is taken out of the furnace, it is quickly placed in the prepared cooling water and rapidly cooled (quenched).

Coating quality inspection and control

After the plasticization is completed, the following indicators need to be tested:

(1) Measurement of coating thickness by coating thickness gauge: Magnetic thickness gauge Mikrotest – 6

(2) Using a spark detector to detect the presence of pinholes in the coating: using LCD -3 type DC spark detection

Measuring instrument

(3) Measuring the hardness of the coating using a hardness tester: GB 6739-86 hardness tester;

(4) Measuring the impact strength of the coating with an impact tester; GB 1732-79 impact tester;

(5) Determination of adhesion level of coating by adhesion meter: GB 9286-88 adhesion tester;

(6) The erosion resistance of the coating is tested by a falling sand abrasion tester : SY 0315-97;

Example 2:

The protective coating of the second embodiment is composed of the following components in percentage by weight:

Polyphenylene sulfide ( PSS ) 80%

Cobalt trioxide (nanoscale) 5%

Titanium dioxide (nanoscale) 10%

Al2O3 (nanoscale) 5%.

Main application: • High abrasion resistance, smooth surface, no pinholes, used for the downhole oil pipe of the harsh environment (including hydrogen sulfide), the inner coating of the conveying pipe.

The construction method of the protective coating of the second embodiment adopts an electrostatic powder spraying process, and the powder preparation process is as follows. The ball-milled suspension is placed in an oven and baked at ll 〇 ° for 6 hours. Control powder particles with a DC of less than 0.074 mm . The method is a coating method in which a powder is adsorbed onto a surface of a workpiece by utilizing a high-voltage electric field induction effect. Then the workpiece is sent to the baking furnace, and the powder is melted by heat and leveled and solidified by crosslinking.

membrane.

Underlying spraying and plasticizing process

The thickness of the bottom layer should be less than 60 um , the plasticizing temperature is 320 ° , and the plasticizing time is 30 minutes.

Surface coating and plasticizing process

Place the workpiece in a dust cover, stop spraying when the sprayed powder is no longer melted, and a layer of powdery material appears on the workpiece, then quickly put it into the plasticizing furnace to plasticize it and cycle it twice until it is required. The coating thickness is 150~250 um . The plasticizing temperature was 340 ° and the plasticizing time was 60 minutes.

Finally, the plasticized workpiece is taken out of the furnace, quickly placed in the prepared cooling water, and rapidly cooled (quenched)

fire).

The oil pipe belongs to the slender pipe. For example, the 2 7/8” oil pipe used in the petroleum industry has an inner diameter of 60 mm and a pipe length of 9.6 . The protective coating of the invention has a high melting point and a high plasticizing temperature, and is currently not sprayable in China. The invention discloses a device and a technology for protecting a coating powder to a petroleum pipe. In order to ensure uniform thickness of the coating, no pinholes, and a smooth surface, a self-developed MPS – powder coating system is adopted . The system utilizes information technology and an automatic control system. Realize computer automatic monitoring and spraying. MPS – powder coating system controls the running track and temperature distribution of the intermediate frequency electromagnetic local heating system, controls the running track of the powder gun, and ensures that the powder can be sprayed evenly, quickly and spirally to the slender oil. The inner wall of the pipe controls the running speed of the oil pipe and sends the oil pipe to the natural gas plasticizing furnace for plasticization. The natural gas plasticizing furnace should make the temperature distribution of each part of the slender oil pipe uniform to ensure the coating quality.

Example 3:

The protective coating of the third embodiment is composed of the following raw materials by weight:

Polyphenylene sulfide ( PSS ) 60%

Fluorine tetras ( 4fi ) 10%

Chromium trioxide ( Cr 2 0 3 ) 5%

Titanium dioxide ( Ti 2 ) 15%

Silicon carbide ( SiC ) 10%

The above materials are all micron-sized materials.

Main application: high hardness, high anti-wear, anti-wax and scale of petroleum pipe, inner coating of downhole oil pipe and conveying pipe used in harsh environment.

The preparation method and construction method of the protective coating of the third embodiment are the same as those of the first embodiment.

Example 4:

This embodiment 4 consists of the following components in percentage by weight:

Polyphenylene sulfide ( PSS ) 57%

Polytetrafluoroethylene ( 4 ) 10%

Cobalt trioxide ( Co 2 0:,) 5%

Titanium dioxide ( Ti 2 ) 25%

Carbon fiber 3%

The above materials are all micron-sized materials.

Main application. • Prevent oil pipe from waxing, scaling, smooth surface, good adhesion and low friction coefficient.

The preparation method and construction method of the protective coating of the fourth embodiment are the same as those of the second embodiment.

The above-mentioned embodiments are further described in the above description of the present invention, but the scope of the above-mentioned subject matter of the present invention should not be construed as being limited to the above embodiments. Any technology implemented based on the above is within the scope of the present invention.

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