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St 35.8/III-1.0305
keyword St 35.8/III-1.0305 Category Steel pipe material Related products Get a quoteAnalysis of Chemical and Mechanical Properties of Spiral Steel Pipe Made of St 35.8/III-1.0305 Material
1、 Chemical composition
Element content range/requirement remarks
Carbon (C) 0.17%~0.23% 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) ≤ 0.035% reduces the risk of hot cracking
2、 Mechanical performance
Performance indicator numerical range/requirement remarks
Tensile strength (Rm) 360-510 MPa suitable for medium and low load requirements
The yield strength (ReH) ≥ 235 MPa (typical value for thickness ≤ 16mm) slightly decreases with increasing thickness
Elongation rate (A) ≥ 21% (with a gauge length of 5 times the diameter of the specimen) to ensure plastic deformation capability
Hardness (HB) ≤ 170 (Brinell hardness) suitable for processing and welding requirements
3、 Key characteristics
Welding performance:
Suitable for submerged arc welding (SAW) and manual arc welding, low hydrogen welding materials (such as E7016) are recommended.
Low carbon equivalent (CE), controllable risk of welding cold cracking.
Molding ability:
The spiral forming process supports the production of large-diameter steel pipes, and cold bending requires controlling the deformation rate to avoid cracking.
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 pipeline systems for water, oil, gas, and other fluids.
Building structure: lightweight support components, steel frame structure.
Mechanical manufacturing: hydraulic system substrate, equipment casing.
5、 Execution standards and testing
Material standards:
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.
Note: The material difference between St 35.8/III-1.0305 and ordinary St 35.8 is mainly reflected in the implementation of standard grading (Level III strengthened testing requirements). It is recommended to choose the appropriate standard according to specific engineering needs.
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