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St 52-3：1.0570
keyword St 52-3：1.0570 Category Steel pipe material Related products Get a quoteChemical and mechanical properties analysis of spiral steel pipe made of St 52-3/1.0570 material
1、 Chemical composition
Carbon (C): ≤ 0.20% (some standards allow melting limits up to 0.22%)
Silicon (Si): ≤ 0.55% (deoxidation strengthening, improving the fluidity of molten steel)
Manganese (Mn): 0.90%~1.65% (enhances strength and toughness, refines grain size)
Phosphorus (P) and sulfur (S): both ≤ 0.04% (strict control of impurity content to reduce cold brittleness)
Trace elements: niobium (Nb), vanadium (V), and titanium (Ti) can be added to refine grain size and enhance overall performance
2、 Mechanical performance
Performance indicator numerical range/requirement remarks
The yield strength (ReH) ≥ 355 MPa (typical value for thickness ≤ 16mm) slightly decreases with increasing thickness
Tensile strength (Rm) 490~680 MPa, with slight differences in upper limit under different standards
Elongation rate (A) ≥ 22% (longitudinal) or ≥ 16% (transverse) with a gauge length of 5 times the diameter of the specimen
Impact toughness (KV) ≥ 27 J (-20 ℃ Charpy V-notch test) maintains toughness under low temperature environment
Hardness (HB) ≤ 170 (Brinell hardness) suitable for welding and processing requirements
3、 Key characteristics
Welding performance:
Low carbon equivalent (CE), suitable for submerged arc welding (SAW) and manual arc welding, requiring the use of low hydrogen welding materials (such as E7016).
The recommended preheating temperature is 100-150 ℃ (when the plate thickness is greater than 20mm).
Molding ability:
Spiral forming can be carried out in hot rolling state, and the deformation rate needs to be controlled during cold bending to avoid cracking.
Corrosion resistance:
Low sulfur and phosphorus content reduces the risk of intergranular corrosion, but requires sandblasting, galvanizing, or epoxy coating to enhance corrosion resistance.
4、 Application scenarios
Architecture and Bridges: High rise building skeletons, bridge support structures, and load-bearing beams.
Mechanical manufacturing: gearboxes, hydraulic support substrates, and heavy-duty equipment frames.
Fluid transportation: Medium and high pressure oil and gas pipelines (subject to additional requirements of API 5L).
5、 Execution standards and testing
Material standards: German DIN 17100 (structural steel) and DIN 1629 (seamless steel pipe).
Testing requirements: Tensile testing, impact testing, and ultrasonic testing (UT) are required. X-ray inspection of welds.
Summary: St 52-3/1.0570 spiral steel pipe is based on low-alloy composition, with high strength, good toughness and weldability, suitable for medium and high load scenarios in the fields of construction, machinery and energy.
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