QStE460N Automotive Steel
QStE460N Automotive Steel: High-Strength Low-Alloy Grade for Lightweight Structural Parts
Explore QStE460N under SEW 092, a thermomechanically rolled fine-grain steel for automobile structures with minimum 460 MPa yield strength and excellent cold formability.
Cold forming, Bending, Stamping, Welding
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QStE460N Automotive Steel Introduction
QStE460N is a high-strength low-alloy (HSLA) steel grade specified in SEW 092, designed for cold-formed automobile structural components. It features a minimum yield strength of 460 MPa and a fine-grain microstructure achieved through thermomechanical rolling. This grade offers an excellent balance of high strength, good toughness, and superior weldability, enabling lightweight design without compromising safety. The 'N' designation indicates delivery in a normalized or normalized-rolled condition, ensuring consistent mechanical properties. It is typically supplied as hot-rolled strip or plate and is suitable for chassis parts, reinforcements, and structural members subjected to high static and dynamic loads.
QStE460N Automotive Steel Chemical Composition
The chemical composition of QStE460N is carefully balanced to achieve a fine-grain structure and high strength while maintaining good weldability and toughness. Microalloying elements such as niobium, vanadium, and titanium are added for grain refinement and precipitation strengthening. Maximum limits are set for phosphorus and sulfur to ensure cleanliness and ductility.
| Element | Standard Value (max %) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.12 | Heat analysis |
| Silicon (Si) | ≤ 0.50 | Heat analysis |
| Manganese (Mn) | ≤ 1.80 | Heat analysis |
| Phosphorus (P) | ≤ 0.025 | Heat analysis |
| Sulfur (S) | ≤ 0.015 | Heat analysis |
| Aluminum (Al total) | ≥ 0.015 | Heat analysis; for fine-grain practice |
| Niobium (Nb) | ≤ 0.09 | Heat analysis; combined V+Nb+Ti ≤ 0.22 |
| Vanadium (V) | ≤ 0.20 | Heat analysis; combined V+Nb+Ti ≤ 0.22 |
| Titanium (Ti) | ≤ 0.15 | Heat analysis; combined V+Nb+Ti ≤ 0.22 |
QStE460N Automotive Steel Physical and Thermal Properties
The physical properties provided below are typical reference values for HSLA steels similar to QStE460N assessed at room temperature unless specified otherwise. These properties, including density, elastic modulus, and thermal conductivity, are essential for design calculations involving thermal cycling, deformation modeling, and weight optimization in automotive engineering. Slight variations may occur depending on exact processing conditions.
| Property | Standard Requirement Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | approx. 7.85 | g/cm³ | At 20 °C |
| Modulus of Elasticity (E) | approx. 210 | GPa | At 20 °C |
| Shear Modulus (G) | approx. 80 | GPa | At 20 °C |
| Poisson's Ratio (ν) | approx. 0.3 | - | At 20 °C |
| Thermal Expansion Coefficient (α) | approx. 12.0 x 10⁻⁶ | K⁻¹ | Between 20 °C and 100 °C |
| Thermal Conductivity (λ) | approx. 42 | W/(m·K) | At 20 °C |
| Specific Heat Capacity | approx. 460 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρ_e) | approx. 0.25 | Ω·mm²/m | At 20 °C |
QStE460N Automotive Steel Mechanical Properties
The mechanical properties of QStE460N are verified at room temperature on transverse test pieces unless otherwise specified. The minimum yield strength is 460 MPa for specified thicknesses. The steel exhibits high tensile strength and adequate elongation for cold-forming operations. Impact toughness is guaranteed at -20 °C for the N grade, ensuring safe application in dynamically loaded structures.
| Property | Standard Requirement Value | Unit | Test Condition |
|---|---|---|---|
| Upper Yield Strength (ReH) | ≥ 460 | MPa | Nominal thickness ≤ 16 mm |
| Tensile Strength (Rm) | 520 to 670 | MPa | Nominal thickness ≤ 16 mm |
| Percentage Elongation after Fracture (A) | ≥ 17 | % | Gauge length L0 = 80 mm, thickness < 3 mm |
| Percentage Elongation after Fracture (A) | ≥ 21 | % | Gauge length L0 = 5.65√S0, thickness ≥ 3 mm |
| Impact Energy (KV2) | ≥ 27 | J | Longitudinal, at -20 °C; thickness ≥ 10 mm |
| Bend Test (Mandrel Diameter) | No cracks | - | 180° bend, mandrel diameter = 0.5t (t = plate thickness, min 3 mm) |
QStE460N Automotive Steel Completely Equivalent International Standards and Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S460MC | Thermomechanically rolled; yield strength 460 MPa |
| Germany | DIN EN 10149-2 | S460MC | Equivalent to EN standard |
| China | GB/T 20887.1 | HR460F | Similar concept for hot-rolled HSLA strip, but check exact limits |
QStE460N Automotive Steel Application Introduction
QStE460N is engineered for lightweight automotive structures requiring high load-bearing capacity and impact toughness. Its excellent cold formability allows production of complex shapes via stamping and bending. Applications are concentrated in components that benefit from thickness reduction while maintaining fatigue life and crashworthiness.
- Typical sectors include automotive manufacturing, commercial vehicle production, and trailer construction.
- Processing often involves laser, arc, and resistance spot welding, for which this grade is well-suited.
Product Applications: Chassis frames and subframes, Longitudinal beams and cross members, Suspension arms and axle components, Wheel rims and wheel discs, Bumper reinforcements and door impact beams
Processed into products: Stamped chassis reinforcements, Cold-formed U-channels and brackets, Welded tube sections for structural frames, Precision bent plates for engine cradles, Laser-cut blanks for assembly welding
Application industries: Passenger vehicle manufacturing, Commercial vehicle and truck manufacturing, Trailer and semi-trailer body construction, Agricultural and construction machinery
QStE460N Automotive Steel Similar or Closely Matching Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S500MC | Higher yield strength (min 500 MPa); similar formability and weldability |
| Europe | EN 10149-2 | S420MC | Lower yield strength (min 420 MPa); more ductile, easier to form |
| Sweden | SS-EN 10149-2 | S460MC | Direct equivalent to European grade |
| Japan | JIS G 3134 | SPFH 540 | HSLA for automobile structural uses with min tensile strength 540 MPa; not a direct strength match |
| Germany | SEW 092 | QStE420TM | Lower strength version with higher formability; thermomechanically rolled |
Notes:
QStE460N must be ordered under SEW 092 (withdrawn but widely used for reference) or its active equivalent EN 10149-2 S460MC. For thicknesses below 3 mm, special agreements on mechanical testing are recommended. Ensure adequate protection against corrosion (e.g., e-coating or galvanizing) for exposed chassis parts. This steel grade is not intended for heat treatment by the customer; its properties are developed during original mill processing.
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