Products News

October 15, 2021

General term for steel pipe

General term   ①Delivery status    refers to the final plastic deformation or final heat treatment state of the delivered product. Generally, those delivered without heat treatment are called hot-rolled or cold-drawn (rolled) state or manufacturing state; those delivered after heat treatment are called heat-treated state, or normalized (normalized), quenched and tempered, solution, annealed according to the type of heat treatment state. When ordering, the delivery status must be indicated in the contract.   ②Delivery according to actual weight or theoretical weight    Actual weight-when delivered, the weight of the product is delivered according to the weighed (weighed) weight;   Theoretical weight-at the […]
October 8, 2021

After-sales service of steel pipe products

After-sales service is not only dealing with the quality of the products sold, but also includes technical exchanges with customers, providing customers with technical support, and quality visits to expand the impact on the company’s products and achieve the expectation of opening up the market and occupying the market. Handling of objections to the quality of the products sold: 1. Requirements for dissimilar handling: After receiving the dissatisfaction notice, the dissident handling personnel should rush to the dissent site as soon as possible (not more than 24 hours at the latest), and determine whether it is our company’s product first; […]
September 30, 2021

Common quality problems of steel pipes

The common quality problems of steel pipes are divided into the following categories: 1. The internal and external quality of steel pipes; 2. Quality problems of geometric dimensions; 3. Unqualified quality problems of physical and chemical properties; 4. Quality problems of tubing and casing threads; 5. Quality problems of users in the process of processing and use; 6. The quality of packaging labeling. 1. The internal and external quality of the steel pipe The appearance quality problems of steel pipes include: external folds, cracks, splits, holes, punctures, external threads, corrections, bumps, pitted surfaces, rolling, folding. Outward folding quality defect: It […]
September 22, 2021

The manufacturing process and popularization and application of thick-walled pipe

Hot rolled (Extruded seamless steel pipe): round tube billet → heating → piercing → three-roll cross rolling, continuous rolling or extrusion → stripping → sizing (or reducing) → cooling → straightening → hydraulic test (or flaw detection) →Marking→Warehousing The raw material for rolling seamless pipes is round pipe blanks. The round pipe blanks are cut by a cutting machine into a billet with a length of about 1 meter, and then sent to the furnace for heating via a conveyor belt. The billet is fed into the furnace and heated at a temperature of approximately 1200°C. The fuel is hydrogen […]
September 8, 2021

Damage and repair of oil and gas well casing

Oil casing is the lifeline to maintain the operation of oil wells. Due to different geological conditions, the downhole stress state is complex, and the combined action of tensile, compressive, bending and torsion stresses on the pipe body, which puts forward higher requirements on the quality of the casing itself. Once the casing itself is damaged for some reason, the entire well may be reduced or even scrapped.   Oil and gas wells are the fixed assets of oil companies, and oil layer casing is the most basic element of oil and gas wells. Once the oil layer casing is […]
August 25, 2021

Technical requirements for hot-dip galvanized steel tubes

Hot-dip galvanizing is to pickle the steel pipe first. In order to remove the iron oxide on the surface of the steel pipe, after the pickling, it is cleaned in a tank of ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to In the hot dip plating tank.Hot dip galvanizing has the advantages of uniform coating, strong adhesion, long service life and strong corrosion resistance. Brand and chemical composition The grade and chemical composition of the steel for galvanized steel pipes should comply with the grade and […]
August 10, 2021

The difference between hot rolled seamless pipe and cold drawn seamless

Both hot rolling and cold rolling are processes for forming section steel or steel plate, and they have a great influence on the structure and performance of steel. The rolling of steel is mainly hot rolling, and cold rolling is only used to produce small section steel and sheet. 1. Hot rolled Advantages: It can destroy the casting structure of the steel ingot, refine the grain of the steel, and eliminate the defects of the microstructure, so that the steel structure is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the […]
July 28, 2021

API screwed steel pipe advantages and disadvantages

The advantages of API standard threads are: 1) Easy to process, general precision, easy to process and connect the related sub on the field, low cost.2) The connection under general operating conditions is easy to repair and handle on site. 3) When used with high quality sealing grease, the fluid sealing condition can reach 69MPa and 1490 C.4) Can be used repeatedly on the buckle. Its disadvantages are: 1) High pressure and gas cannot meet the sealing requirements. 2) The connection strength of API thread is only 80% of the tensile strength of pipe body. 3) In the environment with […]