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Chemical and mechanical properties of spiral steel pipes according to GB/T 1591 standard
1、 Chemical composition
GB/T 1591 Spiral steel pipes are made of low-alloy high-strength structural steel (such as Q355B), and the core chemical composition range is as follows:
Carbon (C): ≤ 0.20% (control carbon content to balance strength and weldability);
Silicon (Si): ≤ 0.50% (deoxidation effect);
Manganese (Mn): 0.90%~1.65% (strengthens the matrix and enhances hardenability);
Phosphorus (P) and sulfur (S): both ≤ 0.035% (strictly limit impurity content);
Alloy elements:
Niobium (Nb): 0.005%~0.05% (refine grain size, enhance toughness);
Vanadium (V): 0.01%~0.12% (precipitation strengthening);
Chromium (Cr), nickel (Ni): ≤ 0.30%, ≤ 0.50% (improves weather resistance).
2、 Mechanical performance
Basic performance (related to thickness):
Yield strength (ReH):
Thickness ≤ 16mm: ≥ 355 MPa；
16~40mm：≥ 345 MPa；
40~63mm：≥ 335 MPa；
Tensile strength (Rm): 470~630 MPa;
Post fracture elongation (A5): ≥ 21%.
Impact toughness:
0 ℃ longitudinal impact energy: ≥ 34 J (V-shaped notch);
Lateral impact energy: ≥ 27 J (some standard requirements).
Other performance:
Weldability: Low carbon equivalent (CEV ≤ 0.43%), supports submerged arc welding, arc welding and other processes, thick plates need to be preheated;
Surface quality: No cracks, folds or other defects, in compliance with appearance standards.
3、 Application Fields
GB/T 1591 Spiral steel pipes are mainly used in engineering scenarios with high strength, high toughness, and low temperature environments:
Building structure: load-bearing frame of high-rise buildings, large-span venues;
Bridge engineering: Main beams and supporting structures of highways and railway bridges;
Energy facilities: low-temperature storage tanks, oil and gas pipelines;
Mechanical manufacturing: heavy equipment frames, engineering vehicle components.
4、 Production and Standards
Execution standard: The material complies with GB/T 1591-2018 (low-alloy high-strength structural steel), and the manufacturing process refers to SY/T 5037-2000 (spiral submerged arc welded pipe);
Production process: strip steel rolling, submerged arc welding, non-destructive testing (ultrasonic testing), hydrostatic testing, etc;
Specification range: Outer diameter 219-3620mm, wall thickness 5-25mm, length can be customized.
(Note: Specific parameters may be adjusted due to material grade, wall thickness, and additional technical requirements.)
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