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St 37.0-1.0254
keyword St 37.0-1.0254 Category Steel pipe material Related products Get a quoteChemical and mechanical properties analysis of spiral steel pipe made of St 37.0/1.0254 material
1、 Chemical composition
Carbon (C): ≤ 0.17% (thickness ≤ 16mm) or ≤ 0.20% (thickness>16mm), balancing strength and weldability
Silicon (Si): ≤ 0.35%, enhances deoxidation ability and optimizes the fluidity of molten steel
Manganese (Mn): ≤ 1.40%, improves thermal processing performance and toughness
Phosphorus (P) and sulfur (S): both ≤ 0.025% (strict control of impurities to reduce the risk of cold brittleness and hot cracking)
2、 Mechanical performance
Tensile strength: 340~470 MPa (meets the requirements of medium and low load structures)
Yield strength: ≥ 235 MPa (slightly decreases with increasing thickness when thickness ≤ 16mm)
Elongation rate: ≥ 25% (5 times the diameter of the specimen to ensure molding and plastic deformation capabilities)
Impact toughness: ≥ 27 J at room temperature (suitable for general industrial environments)
Hardness: ≤ 170 HB (Brinell hardness, workability, and welding compatibility)
3、 Key performance characteristics
Weldability: Suitable for submerged arc welding (SAW) and high-frequency welding (ERW), requiring controlled preheating temperature (100-200 ° C) and the use of low hydrogen welding materials
Corrosion resistance: Low sulfur and phosphorus content reduces the risk of intergranular corrosion, but high corrosion environments require surface coating or galvanizing treatment
Molding ability: The spiral forming process allows for room temperature bending and is suitable for processing large diameter (such as 3620mm) steel pipes
4、 Application scenarios
Building structure: static load components such as load-bearing beams and support columns
Mechanical manufacturing: low stress components such as equipment frames and conveyor rollers
Basic engineering: bridge pile foundation, underground pipe gallery (requiring anti-corrosion treatment)
5、 Execution standards and testing
Material standard: German DIN 17100 (ordinary structural steel)
Quality verification: Tensile testing, impact testing, and ultrasonic testing (UT) are required for weld X-ray inspection.
St 37.0/1.0254 spiral steel pipe is based on low-carbon and high plasticity, balancing strength and processing performance, and is widely used in fields such as construction and machinery. However, additional protection requirements should be noted under extreme working conditions such as high sulfur and low temperature.
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