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GOST 20295-K34
keyword GOST 20295-K34 Category Steel pipe material Related products Get a quoteGOST 20295-K34 Steel Grade Submerged Arc Welded Spiral Seam Steel Pipe Chemical Composition and Mechanical Properties
1、 Chemical composition
Carbon (C): ≤ 0.20% (low-carbon design to optimize welding performance).
Silicon (Si): ≤ 0.55% (deoxidation and grain refinement).
Manganese (Mn): ≤ 1.60% (strengthens the matrix and enhances toughness).
Phosphorus (P): ≤ 0.035% (limiting cold brittleness).
Sulfur (S): ≤ 0.035% (reduces the tendency for hot cracking).
Micro alloying elements (vanadium V, niobium Nb, titanium Ti): added in small amounts to refine grain size and enhance strength.
2、 Mechanical performance
Strength and plasticity
Yield strength (Re): ≥ 345 MPa (corresponding to K34 strength grade).
Tensile strength (Rm): ≥ 470-630 MPa (inferred based on similar steel grades).
Elongation (A): ≥ 21% (plastic deformation capacity).
Resilience requirements
Low temperature impact toughness: It is required to meet the impact energy requirements at -20 ℃ environment (specific values are not specified, refer to similar standards).
3、 Manufacturing and testing requirements
Forming process
Spiral welding: manufactured using arc welding process (type 2 steel pipe in GOST 20295 standard).
Tolerance control:
Outer diameter tolerance: ± 0.75% (applicable to 159-820mm specifications).
Wall thickness tolerance: ± 10% of nominal wall thickness.
Testing requirements
Non destructive testing: The quality of the weld seam needs to be tested by ultrasonic or X-ray.
Hydrostatic test: Test the pressure bearing performance according to the standard pressure formula.
4、 Application scenarios
Oil and gas transportation: suitable for medium and low pressure transmission pipelines of petroleum, natural gas, and refined oil products.
In the industrial field, it can be used in scenarios such as process pipelines and mining pipelines.
(Note: The specific parameters of GOST 20295-K34 may be adjusted due to production standards or contract terms. It is recommended to refer to the version of the standard document.)
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