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Chemical and mechanical properties of A36 grade spiral steel pipes
1、 Chemical composition
The chemical composition of A36 spiral steel pipe is based on ASTM A36/A36M standard, as follows:
Carbon (C): ≤ 0.25%~0.29% (slightly different source ranges);
Silicon (Si): 0.15%~0.40%;
Manganese (Mn): 0.80%~1.20% (optimized strength and processability);
Phosphorus (P): ≤ 0.04% (impurity control);
Sulfur (S): ≤ 0.05% (strictly limited to reduce brittleness);
Copper (Cu): ≥ 0.20% (copper containing steel must meet, not mandatory).
2、 Mechanical performance
Intensity index:
Yield strength (σ s): ≥ 250 MPa (small value, some data can reach up to 360 MPa, increasing thickness may reduce strength);
Tensile strength (σ b): 400~550 MPa (typical range);
Yield strength ratio (σ s/σ b): not explicitly defined, but must meet plasticity requirements.
Plasticity and toughness:
Elongation rate (δ 5): ≥ 20% (elongation at break);
Impact toughness:
Maintaining good toughness under low temperature conditions (no specific value, but able to resist brittle fracture);
The impact energy is related to temperature and thickness, and the process needs to be adjusted according to the working conditions.
Other performance:
Density: 7.85 g/cm ³ (universal value for steel);
Thermal conductivity: good (suitable for hot processing environment);
Weldability: Excellent (supporting multiple welding processes).
3、 Application Fields
A36 spiral steel pipe is widely used in the following scenarios:
Architecture and bridges: riveted/welded structures, load-bearing components (such as highway bridges);
Mechanical manufacturing: construction machinery (excavators, crane frames), agricultural equipment;
General structure: structural components for non special corrosive environments such as ships, vehicles, pressure vessels, etc.
4、 Precautions
Production process: Usually delivered in a hot-rolled state, the rolling process needs to be controlled to balance strength and toughness;
Anti corrosion treatment: Surface treatment (such as galvanizing, painting) is required in humid or corrosive environments;
Standard difference: The mechanical properties of different thickness plates need to be adjusted according to ASTM standards.
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