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St 44.0-1.0256
keyword St 44.0-1.0256 Category Steel pipe material Related products Get a quoteAnalysis of Chemical and Mechanical Properties of Spiral Steel Pipe Made of St 44.0/1.0256 Material
1、 Chemical composition
Carbon (C): 0.18%~0.25% (balanced strength and weldability)
Silicon (Si): ≤ 0.55% (deoxidation strengthening, improving heat resistance)
Manganese (Mn): 1.20%~1.50% (enhances toughness and anti-wear performance)
Phosphorus (P) and sulfur (S): both ≤ 0.035% (strict control of impurities to reduce the risk of cold brittleness and hot cracking)
2、 Mechanical performance
Tensile strength: 440~590 MPa (meets the requirements of medium load structures)
Yield strength: ≥ 275 MPa (typical value for thickness ≤ 20mm, slightly decreasing with increasing thickness)
Elongation rate: ≥ 20% (gauge length 50mm, ensuring plastic deformation capacity)
Impact toughness:
Room temperature (20 ℃): ≥ 27 J (Charpy V-notch test)
Low temperature (-20 ℃): The toughness has slightly decreased, but it can still meet general industrial needs
Hardness: ≤ 200 HB (Brinell hardness, processing and welding compatibility)
3、 Key performance characteristics
Weldability:
Suitable for submerged arc welding (SAW) and manual arc welding, low hydrogen welding rods (such as E7016) should be used
The recommended preheating temperature is 100-150 ℃ (when the plate thickness is greater than 20mm)
Corrosion resistance:
Low sulfur and phosphorus content reduces the risk of intergranular corrosion, but high corrosion environments require surface coating or galvanizing treatment
Molding ability:
Hot rolled state supply, deformation rate needs to be controlled during cold bending to avoid cracking
4、 Application scenarios
Construction engineering: steel structure factory buildings, bridge supports, and high-rise building skeletons
Mechanical manufacturing: gearbox body, transmission shaft, hydraulic support substrate
Transportation: truck chassis, rail vehicle connectors
Industrial pipelines: transportation of medium and low pressure fluids (water, oil, gas) and structural support
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.
This material spiral steel pipe is based on a medium carbon composition, with both strength and processing performance, suitable for medium load scenarios such as construction and machinery, but additional protection should be taken into account in high sulfur environments or low temperature conditions.
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