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St 52.0-1.0421
keyword St 52.0-1.0421 Category Steel pipe material Related products Get a quoteAnalysis of Chemical and Mechanical Properties of Spiral Steel Pipe Made of St 52.0/1.0421 Material
1、 Chemical composition
Carbon (C): ≤ 0.22% (balance strength and weldability, the upper limit of thick walled pipes can be relaxed to 0.25%)
Silicon (Si): ≤ 0.55% (optimized deoxidation effect, improved fluidity of molten steel)
Manganese (Mn): ≤ 1.60% (improves strength and toughness, refines grain size)
Phosphorus (P) and sulfur (S): ≤ 0.04% and ≤ 0.035% respectively (strict control of impurities to reduce the risk of cold brittleness and hot cracking)
Aluminum (Al): ≥ 0.02% (used for deoxidation and improving toughness)
2、 Mechanical performance
Tensile strength: 500~650 MPa (suitable for medium to high load requirements)
Yield strength:
Wall thickness ≤ 16mm: ≥ 355 MPa
Wall thickness 16~40mm: ≥ 345 MPa
Wall thickness 40~65mm: ≥ 335 MPa
Elongation rate: ≥ 21% (longitudinal) or ≥ 19% (transverse), with a gauge length of 5 times the diameter of the specimen
Impact toughness: not explicitly stated, but the ambient temperature impact toughness of similar low-alloy steels is usually ≥ 27 J
Hardness: not directly labeled, but Brinell hardness is generally ≤ 170 HB (suitable for welding and processing)
3、 Key performance characteristics
Weldability:
Suitable for submerged arc welding (SAW) and high-frequency welding (ERW), requiring control of preheating temperature (100-200 ° C) and use of low hydrogen welding materials
Low carbon equivalent (CE), controllable risk of welding cold cracking
Molding ability:
The spiral forming process allows for room temperature bending and can produce large diameter (such as 3620mm or more) steel pipes
Corrosion resistance:
Basic anti-corrosion requires sandblasting, galvanizing, or epoxy coating, and special treatment is required for high sulfur/salt spray environments
4、 Application scenarios
High pressure fluid transportation: oil and gas pipelines (subject to additional requirements of API 5L standard)
Architecture and bridges: load-bearing beams, bridge support structures (requiring anti-corrosion design)
Mechanical manufacturing: Heavy equipment frames, hydraulic cylinder barrels, and other high stress components
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.
The St 52.0/1.0421 spiral steel pipe is composed of medium carbon and low-alloy components, with high strength and processing performance, suitable for medium to high load scenarios, but attention should be paid to the compatibility of welding processes and anti-corrosion measures.
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