QStE500TM is a high-strength low-alloy (HSLA) structural steel primarily used in automotive manufacturing and other industrial applications. Here are its key characteristics:
Material Properties
Yield Strength: ≥500 MPa
Tensile Strength: 550–700 MPa
Elongation: ≥17% (for thickness ≥3mm)
Density: 7.85 g/cm³
Chemical Composition
Carbon (C): ≤0.12%
Manganese (Mn): ≤1.70%
Silicon (Si): ≤0.50%
Phosphorus (P): ≤0.025%
Sulfur (S): ≤0.020%
Microalloying elements (Nb, V, Ti): ≤0.22% combined
Key Features
Cold Formability: Excellent for complex automotive parts like chassis beams and wheel rims .
Weldability: Compatible with common methods (e.g., arc welding, laser welding) .
Corrosion Resistance: Enhanced by hot-rolled acid-washed surface treatment .
Applications
Automotive: Cross beams, axles, and structural components.
Construction: Bridges and high-rise buildings.
Machinery: Heavy equipment frames and load-bearing parts.
Standards & Equivalents
Primary Standard: Q/BQB 310 (Baosteel).
International Equivalents:
EN 10149-2: S500MC
ASTM: X70XLK.
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