QStE420 is a high-strength, low-alloy structural steel widely used in the automotive and construction industries. The name “QStE” indicates that the steel is of high strength (“Q” for “high-quality”), suitable for cold forming (“StE” for “Stahl für Einarbeitung,” meaning “steel for processing” in German), and “420” denotes the minimum yield strength of 420 MPa. QStE420 is known for its excellent formability, weldability, and impact resistance, making it ideal for applications such as car chassis, frames, and other critical structural components.
Element | Composition (max) |
---|---|
Carbon (C) | 0.12% |
Manganese (Mn) | 1.60% |
Phosphorus (P) | 0.025% |
Sulfur (S) | 0.020% |
Silicon (Si) | 0.50% |
Aluminum (Al) | 0.015% (min) |
Property | Metric | Imperial |
---|---|---|
Density | 7.85 g/cm³ | 0.283 lb/in³ |
Melting Point | 1425-1460°C | 2597-2660°F |
Boiling Point | Not typically specified | Not typically specified |
Thermal Conductivity | 45-55 W/m·K | 26-32 Btu·ft/h·ft²·°F |
Electrical Conductivity | 10-15% IACS | 10-15% IACS |
Specific Heat Capacity | 450-500 J/kg·K | 0.108-0.119 Btu/lb·°F |
Thermal Expansion Coefficient | 11-13 × 10⁻⁶ /°C | 6.1-7.2 × 10⁻⁶ /°F |
Electrical Resistivity | 0.2-0.4 µΩ·m | 0.12-0.24 µΩ·ft |
Property | Metric | Imperial |
---|---|---|
Tensile Strength | 480-620 MPa | 69,600-89,900 psi |
Yield Strength | ≥ 420 MPa | ≥ 60,900 psi |
Brinell Hardness (HB) | 130-180 HB | 130-180 HB |
Rockwell Hardness (HRC) | 20-25 HRC | 20-25 HRC |
Vickers Hardness (HV) | 150-200 HV | 150-200 HV |
Elongation | 15-22% | 15-22% |
Elastic Modulus | 210 GPa | 30,000 ksi |
Industry | Products |
Aerospace | Fuselage Structures, Landing Gear |
Automotive | Chassis Components, Suspension Systems |
Construction | Building Frames, Support Beams |
Heavy Machinery | Machine Frames, Hydraulic Components |
Railway | Train Frames, Rail Tracks |
Shipbuilding | Hull Structures, Decks |
Energy Sector | Wind Turbine Towers, Pipeline Supports |
Mining | Conveyor Systems, Crusher Jaws |
QStE420 Heat Treating Instructions: QStE420 steel is typically processed through controlled rolling rather than quenching and tempering. This controlled rolling enhances its mechanical properties without the need for additional heat treatment.
QStE420 Surface Finish: The surface of QStE420 steel can be treated through various methods, such as hot-dip galvanizing, painting, or powder coating, to improve corrosion resistance and extend durability.
Custom grades can be produced upon request to meet specific requirements.
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