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St 45.8/I-1.0405
keyword St 45.8/I-1.0405 Category Steel pipe material Related products Get a quoteChemical and mechanical properties analysis of spiral steel pipe made of St 45.8/I-1.0405 material
1、 Chemical composition
Element content range/requirement remarks
Carbon (C) 0.21%~0.28% optimized weldability and cold bending performance
Silicon (Si) 0.10%~0.35% deoxidation strengthening improves the fluidity of molten steel
Manganese (Mn) 0.40%~0.80% enhances strength and toughness
Phosphorus (P) ≤ 0.035%, strictly control impurities, reduce cold brittleness
Sulfur (S) ≤ 0.025% reduces the risk of hot cracking
2、 Mechanical performance
Performance indicator numerical range/requirement remarks
Tensile strength (Rm) 410~530 MPa suitable for medium to high load requirements
Typical values for yield strength (ReH) ≥ 245~255 MPa and thickness ≤ 16mm
Elongation rate (A) ≥ 21% (with a gauge length of 5 times the diameter of the specimen) to ensure plastic deformation capability
Hardness (HB) ≤ 229 (Brinell hardness) suitable for processing and welding requirements
3、 Key characteristics
Welding performance:
Low carbon equivalent (CE), suitable for submerged arc welding (SAW) and manual arc welding, with controllable risk of cold cracking.
Molding ability:
Supporting cold local stamping, bending, and edge rolling processing, the spiral forming process is suitable for the production of large-diameter steel pipes.
Corrosion resistance:
Low sulfur and phosphorus content reduces the risk of intergranular corrosion, but requires the use of galvanized or epoxy coatings to enhance corrosion resistance.
4、 Application scenarios
Fluid transportation: medium and low pressure oil, natural gas, and water pipe systems.
Building structure: bridge supports, steel frame structures.
Mechanical manufacturing: gears, transmission shafts, and hydraulic system components.
5、 Execution standards and testing
Material standard: Complies with the specifications for high-quality carbon structural steel, referring to German DIN standards and Chinese GB/T 9711.
Testing requirements: Tensile testing, hardness testing, ultrasonic testing (UT), and X-ray inspection of welds are required.
Summary: St 45.8/I-1.0405 spiral steel pipe is based on low-carbon composition, with moderate strength, good plasticity, and weldability, suitable for medium to high load scenarios in the fields of construction, machinery, and fluid transportation.
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