GOST 20295 Welded steel pipes for main pipelines such as oil and gas

GOST 20295 is a standard developed by Russia for welded steel pipes used in oil, gas and other mainline pipelines. It applies to steel long welded pipes with diameters ranging from 219 mm to 3620 mm and wall thicknesses ranging from 5 mm to 50 mm, including spiral welded pipes and straight seam welded pipes. This standard specifies the manufacturing process of pipes (such as submerged arc welded steel pipes), mechanical properties, chemical composition, testing methods (such as hydrostatic testing, flattening testing, tensile testing), and quality control requirements, as well as the stability and reliability of steel pipes when transporting media.

Material and performance requirements

According to GOST 20295 standard, commonly used materials for spiral steel pipes include K34, K52, K55, K56, K60, etc., which correspond to different yield strength and tensile strength grades. For example, the yield strength of K55 material is 375-550MPa, which is suitable for medium and high pressure oil and gas transportation. The standard also emphasizes low-temperature impact toughness testing, requiring steel pipes to maintain their performance in cold environments to meet the geographical requirements of Russia and the CIS countries.

Production and Testing Practice

The production of GOST 20295 spiral steel pipes requires the use of double-sided submerged arc welding technology and non-destructive testing methods such as X-ray inspection and ultrasonic inspection for weld quality. The finished product needs to undergo hydrostatic pressure testing (high pressure 5.05MPa, holding pressure for more than 5 seconds) and mechanical performance testing.

Technical requirements of GOST 20295-85 standard

GOST 20295-85 is a standard developed by Russia for steel long welded pipes (including straight and spiral welded pipes), suitable for high-pressure transportation scenarios such as oil and natural gas. This standard specifies that the diameter range of steel pipes is 219 millimeters to 1420 millimeters, and the wall thickness is 5 millimeters to 50 millimeters, covering materials such as K52, K55, K60, etc. The standard requires that steel pipes be manufactured using resistance welding technology and undergo quality control tests such as hydrostatic pressure test, flattening test, and tensile test to evaluate their mechanical properties and pressure resistance. For applications in low-temperature environments, the standard also emphasizes the requirement for low-temperature impact testing to meet the usage needs under harsh climate conditions in Russia.

Production and certification of spiral steel pipes

Spiral steel pipes that comply with GOST 20295 standards must be certified by Russian GOST-R and meet technical specifications. The certification process includes submitting an application form, sample testing, factory audit, and other steps. The steel pipe material must comply with the specified steel grade in the standard (such as K34-K60), and the production process must follow the requirements of resistance welding technology. Some companies also produce in accordance with international standards (such as API 5L) to meet export demands. After certification, the product needs to undergo regular re inspection to maintain the validity of the certificate.

Application Fields and Market Supply

GOST 20295-85 spiral steel pipe is mainly used in the fields of oil and gas transmission trunk lines, chemical pipelines, and high-pressure vessels. Multiple domestic enterprises, such as Hebei Tirec and Haiqianwei Steel Pipe, can customize the production of this type of steel pipe, supporting specifications ranging from 508 millimeters to 1422 millimeters in diameter, with materials covering L245/X42 to X80 grades. Some suppliers provide products with optimized low-temperature toughness and are equipped with anti-corrosion, insulation and other treatment processes to meet different engineering needs.

Association with other standards

GOST 20295 forms a complementary system with other steel pipe standards in Russia, such as GOST 10704-91 and GOST 3262-75, covering steel pipes of different diameters and uses. At the same time, there are some parameter correspondences between this standard and international standards such as API 5L and EN 10219. For example, the performance of materials K55 and X52 is similar, which facilitates the selection of cross-border projects. Enterprises need to pay attention to the detailed requirements of post weld burr treatment and layer control in the standards during production, in order to comply with Russian technical specifications.

(Note: Parameters may be adjusted due to engineering requirements;)