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St 35.8/I-1.0305
keyword St 35.8/I-1.0305 Category Steel pipe material Related products Get a quoteAnalysis of Chemical and Mechanical Properties of St 35.8/I Spiral Steel Pipe
1、 Chemical composition
Carbon (C): 0.17%~0.23% (optimized weldability and cold bending performance)
Silicon (Si): 0.10%~0.35% (deoxidation strengthening, improving the fluidity of molten steel)
Manganese (Mn): 0.40%~0.80% (improves strength and toughness)
Phosphorus (P) and sulfur (S): both ≤ 0.035% (strict control of impurities to reduce cold brittleness)
2、 Mechanical performance
Tensile strength: 360~510 MPa (suitable for medium and low load structural requirements)
Yield strength: ≥ 235 MPa (typical value for thickness ≤ 16mm, slightly decreasing with increasing thickness)
Elongation rate: ≥ 21% (with a gauge length of 5 times the sample diameter to ensure plastic deformation capacity)
Hardness: ≤ 170 HB (Brinell hardness, processing and welding compatibility)
3、 Key performance characteristics
Weldability: Suitable for submerged arc welding (SAW) and manual arc welding, recommended low hydrogen welding materials (such as E7016)
Forming ability: Spiral forming can be performed in hot rolling state, and deformation rate needs to be controlled during cold bending
Corrosion resistance: Low sulfur and phosphorus content reduces the risk of intergranular corrosion, and it is recommended to use surface coating to enhance corrosion resistance
4、 Application scenarios
Fluid transportation: medium and low pressure pipeline systems for water, oil, gas, etc
Mechanical structure: Hydraulic system substrate, lightweight equipment frame
Construction engineering: scaffolding, steel structure support components
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 35.8/I spiral steel pipe is based on low-carbon components, with good weldability, plasticity, and moderate strength, suitable for medium and low load scenarios in the fields of construction, machinery, and fluid transportation.
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