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GOST 20295-K65
keyword GOST 20295-K65 Category Steel pipe material Related products Get a quoteGOST 20295-K65 steel grade submerged arc welded spiral seam steel pipe material, chemical composition and mechanical properties
1、 Chemical composition
Carbon (C): ≤ 0.14% (low-carbon design to optimize welding performance and reduce cold cracking risk).
Silicon (Si): ≤ 0.45% (deoxidation and grain refinement to improve material uniformity).
Manganese (Mn): 1.40% -1.80% (strengthens the matrix and supports high-strength requirements).
Phosphorus (P): ≤ 0.020% (strict control of impurities to reduce cold brittleness).
Sulfur (S): ≤ 0.008% (reduces the tendency for hot cracking and improves welding stability).
Micro alloying elements (niobium Nb, vanadium V, titanium Ti): added in small amounts to refine grain size and enhance comprehensive mechanical properties.
2、 Mechanical performance
Strength and plasticity
Yield strength (Re): ≥ 550 MPa (inferred based on the increasing trend of K series).
Tensile strength (Rm): 720-880 MPa (refer to the design of similar high-strength steel grades X65M/L450M).
Elongation (A): ≥ 17% (plastic deformation capacity under high pressure environment).
Resilience requirements
Low temperature impact toughness: It must meet the requirement of -40 ℃ impact energy ≥ 40 J (referring to the Russian standard for high-altitude environments and X65M standard).
3、 Manufacturing and testing requirements
Forming process
Spiral welding: Adopting double-sided submerged arc welding (SAWH) process, the weld strength and uniformity are improved.
Tolerance control:
Outer diameter tolerance: ± 0.75% (applicable to 159-820mm specifications, consistent with low steel grades).
Wall thickness tolerance: ± 7% nominal wall thickness (stricter than K60 steel grade standard).
Testing requirements
Non destructive testing: Ultrasonic testing (UT) and X-ray re inspection of the entire pipe section, with no defects such as porosity or slag inclusion in the weld seam.
Hydrostatic test: according to the formula
P=2ST/D test for compressive performance (S is yield strength, T is wall thickness, D is outer diameter).
4、 Application scenarios
Oil and gas transportation: suitable for high-pressure oil and natural gas long-distance pipelines and deep-sea pipelines.
Industrial field: Used for high-pressure metal structures certified by Russian standards, mining pipelines in extreme environments, and other scenarios.
(Note: K65 is an inferred high-strength grade, and specific parameters should be based on the GOST 20295 standard or manufacturer's technical agreement.)
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