Products News

August 19, 2022

Differences between the characteristics of different grades of alloy steel pipes, and application cases

Differences between the characteristics of different grades of alloy steel pipes, and application cases 12CrlMoV This steel has the characteristics of creep limit and lasting strength values are similar, in the long-term stretch, it has high plasticity, its oxidation resistance and thermal strength are higher than 2CrMoV, and the workmanship and weldability are good (preheating before welding, post-welding heat treatment to eliminate stress), generally used after normalizing and high temperature tempering Used to manufacture superheated steel pipes, conduits, radiator tubes and related forgings in high-pressure equipment with working temperatures not exceeding 570 ~ 585 °C 25Cr2MoVA medium carbon heat-resistant steel, […]
August 12, 2022

A691Gr2-1 / 4CrCL22 high temperature and high pressure steel pipe

First, SA691Gr2-1/4CrCL22 is mainly used as welded pipe for power equipment A691 grade is mainly used for high temperature and high pressure carbon steel and alloy steel point melt welded steel nominal pipe Second, SA691 is a high temperature and high pressure reconsideration condition with electric fusion welding steel and alloy steel standards, the grade of steel pipe reaches SA691Gr2-1/4Cr, to go through the effect force treatment, radiographic inspection and water pressure test. SA691Gr2-1/4CrCL22 is a kind of CR-MO heat-resistant steel, the basic components are 2.25% CR, 1% MO. Equivalent to the seamless tube SA-335P22, Maigang A691 is used as […]
August 12, 2022

Introduction to A335 P91 Alloy Pipe- 10Cr9Mo1VNb

A335 refers to the executive standard: ASTM A335 seamless ferritic alloy steel pipe for high temperature P91 is a material in the ASTM A335 standard: I. Introduction to 10Cr9Mo1VNb: 10Cr9Mo1VNb is equivalent to T91 or P91 and implements the standard ASTM A213 ASTM A335. 10Cr9Mo1VNb not only has high oxidation resistance and high temperature steam corrosion resistance, but also has good impact toughness and high and stable durability plasticity and thermal strength. When the use temperature is lower than 620 °C, 10Cr9Mo1VNb uses a higher stress than austenitic stainless steel. Above 550 °C, the recommended design uses stresses approximately twice […]
July 15, 2022

Quality requirements for seamless steel pipes

(1) Quality requirements ①Chemical composition of steel: The chemical composition of steel is one of the most important factors affecting the performance of seamless steel pipes, and it is also the main basis for formulating process parameters for rolling and heat treatment of steel pipes. Alloying elements: intentionally added, according to application Residual elements: brought into steelmaking, properly controlled Hazardous elements: strictly controlled (As, Sn, Sb, Bi, Pb), gases (N, H, O) Out-of-furnace refining or electroslag remelting: improve the uniformity of the chemical composition in the steel and the purity of the steel, reduce the non-metallic inclusions in the billet […]
July 9, 2022

erw ,roll bending pipes,sprial pipes,different manufacturing processes

pdf downloads: welded pipes different manufacturing processes MAJOR PODUCTION USAGE: The manufacturing process of different welded pipes,Comparison table of steel pipe manufacturing standard grades in different countries. pdf  downloads:02.Comparison table of steel pipe manufacturing standard grades in different countries    
July 5, 2022

Classification, production process and mechanical properties of seamless steel pipes

According to different production methods, it is divided into hot-rolled pipe, cold-rolled pipe, cold-drawn pipe, extruded pipe, pipe jacking, etc., all of which have their own process regulations. The materials are ordinary and high-quality carbon structural steel (Q215-A~Q275-A and 10~50 steel), low alloy steel (09MnV, 16Mn, etc.), alloy steel, stainless acid-resistant steel, etc. According to the use, it is divided into two categories: general use (for water, gas pipelines and structural parts, mechanical parts) and special (for boilers, geological exploration, bearings, acid resistance, etc.). Seamless steel pipes are widely used. General-purpose seamless steel pipes are rolled from ordinary carbon structural […]
June 29, 2022

API 1104 Sources of Piping and Related Facilities

The API 1104 standard, developed by the American Petroleum Institute (API), is the industry standard for welding applications. This standard provides a method for producing high-quality welds in a novel and understandable format using qualified welders, approved welding procedures, materials and equipment. The full name of the standard is as follows: API 1104 Welding of Piping and Related Facilities. This standard contains detailed and multi-year industry information and provides inspection methods to authorized organizations to ensure accurate analysis of weld quality using qualified technicians and approved methods and equipment. The API 1104 standard covers gas and arc welding of low alloy steel […]
June 23, 2022

Basic knowledge and uses of seamless steel pipes, oil casings and pipes

Knowledge of oil casing Basic knowledge Oil casing is a large-diameter pipe that acts to fix the wall or bore of oil and gas oil wells. The casing is inserted into the wellbore and fixed with cement to prevent the wellbore from separating the rock formation and the wellbore from collapse, and to ensure the circulating flow of drilling mud to facilitate drilling and exploitation. Different types of casings are used in oil production: Surface oil casing – protects the well from contamination by shallow water and shallow gas layers, – supports wellhead equipment and maintains the weight of other […]
June 21, 2022

Seamless Steel Pipe Wall Thickness Variation Control Technology

Reducing the amount of variation, or achieving more wall thickness consistency, can be the difference between meeting a customer’s requirements or not. It also helps to reduce or even may eliminate the customer’s need for subsequent processes such as machining. Seamless tube typically is manufactured on a two-roll piercer mill. In some cases this step alone is sufficient to produce tube that satisfies the customer’s requirements. However, if wall thickness consistency needs further improvement after piercing, a tube producer can use additional equipment and process steps. Two such types of equipment are a cross-rolling elongator mill (commonly known by its […]
June 21, 2022

How wear occurs in pipes and why high-strength wear-resistant steel outperforms regular steel pipe in abrasive environments

  In transportation systems that use pipes, wear occurs when hard particles or abrasive slurry particles slide along or are forced against the pipe walls. This action on the pipe wall can lead to loss of material and, in extreme cases, leakage or failure of the pipe. Ordinary steel pipes simply cannot withstand a corrosive environment for more than a year or two. Although ordinary steel pipes have good strength and impact resistance, in such high-wear areas, their wear resistance is poor compared with high-strength wear-resistant pipes. How about wear-resistant cast pipe? Steel pipes and tubes that are very hard […]
June 20, 2022

Welded vs. Seamless Production in the Tube-Making Process

Welded vs. Seamless Production in the Tube-Making Process Steel tubes, from automobile manufacturing to gas pipes, can be either welded from alloys – metals made from different chemical elements – or constructed seamlessly from a melting furnace. While welded tubes are forced together through methods such as heating and cooling and used for heavier, more rigid applications such as plumbing and gas transportation, seamless tubes are created through stretching and hollowing for more lightweight and thinner purposes such as bicycles and liquid transportation. The production method lends much to the various designs of the steel pipe. Changing the diameter and thickness […]
June 17, 2022

Classification and function of casing

Casing Classification and function of casing Casing is the steel pipe that supports the wall of oil and gas wells. Several layers of casing are used for each well according to different drilling depths and geological conditions. Cement cementing should be used after the casing is run down the well. It is different from tubing and drill pipe and cannot be reused. It is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes. Casing can be divided into: conduit, surface casing, technical casing and oil casing according to the usage, […]
May 31, 2022

Steel pipe cement-soil pile construction method (synthetic steel pipe pile construction method)

This kind of construction method refers to the construction method of burying the steel pipe piles with side protrusions (ribs) in the cement-soil column, and integrating the two to form a composite pile. The so-called cement-soil column is a mixture of cement slurry and soil with a poor mix ratio injected from the cobalt head while drilling with a special drill bit on the pile position. The diameter of the synthetic steel pipe pile (that is, the diameter of the cement-soil column) is 600~1500mm, which is 200~400mm larger than the outer diameter of the steel pipe, and the applicable pile […]
May 19, 2022

Examples of steel pipe pile construction methods

4.1 Drum-type diesel hammer impact pile driving method (1) The method of “heavy hammer and low strike” should be adopted for piling. (2) The pile frame generally adopts a 3-point support crawler pile driver. (3) The elevation of the pile top of the steel pipe pile in the piling sequence is often buried below the natural ground according to the design. During construction, it can be adopted: @ excavate the soil to the design elevation of the pile top before piling; ② The pile top is driven to the natural ground, and then the pipe is cut To the design […]
May 9, 2022

Steel Pipe Piles Overview and Construction Method

1 Overview For more than half a century, steel pipe piles have gradually become one of the main types of piles in foundation engineering. Steel pipe piles are widely used in Shanghai, my country, and some deep-water wharves, Baoshan iron and steel plants, power plants and dozens of high-rise buildings are all based on steel pipe piles. 2 Advantages and disadvantages of steel pipe piles (1) Advantages: Good driving resistance, that is, it can withstand a strong impact force when it is driven into the soil, has a strong ability to penetrate the hard soil layer, and can effectively drive […]