EN 10149-2 S460MC Steel
EN 10149-2 S460MC Steel - High-Strength Low-Alloy Plate for Automotive Cold Forming
EN 10149-2 S460MC is a hot-rolled high-strength low-alloy steel with minimum yield strength 460 MPa, specifically designed for cold forming. It combines good weldability, high fatigue strength and excellent formability for demanding automotive structural applications.
Cold forming, bending, stamping, deep drawing, welding, punching, laser/plasma cutting
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EN 10149-2 S460MC Steel Introduction
S460MC is a hot-rolled, thermomechanically rolled structural steel according to EN 10149-2. It belongs to the family of high-strength low-alloy (HSLA) steels with fine grain structure achieved through microalloying (niobium, vanadium, titanium). The steel offers a minimum yield strength of 460 MPa in delivery condition, excellent cold formability, good weldability and high fatigue resistance. It is primarily used in the automotive industry for weight-optimised chassis and structural components where high strength and energy absorption are critical. The material is typically supplied as-rolled or normalised rolled, in thicknesses from 1.5 mm up to 20 mm, as coils or cut-to-length sheets.
EN 10149-2 S460MC Steel Chemical Composition
The chemical composition according to EN 10149-2:2013 for S460MC. Microalloying elements Nb, V and Ti are added singly or in combination to achieve grain refinement and precipitation hardening. The sum Nb+V+Ti is restricted to guarantee consistent formability and weldability.
| Element | Standard Value (wt%) | Notes |
|---|---|---|
| C | ≤ 0.12 | max |
| Si | ≤ 0.50 | max |
| Mn | ≤ 1.60 | max |
| P | ≤ 0.025 | max |
| S | ≤ 0.015 | max |
| Al total | ≥ 0.015 | minimum for fine grain practice |
| Nb | ≤ 0.09 | max |
| V | ≤ 0.20 | max |
| Ti | ≤ 0.22 | max |
| Nb+V+Ti | ≤ 0.22 | maximum sum of microalloying elements |
EN 10149-2 S460MC Steel Thermal and Electrical Physical Properties
Typical physical properties for S460MC are based on general low-alloy structural steels. These values are not mandated by EN 10149-2 and serve as engineering guidelines. Actual properties can vary slightly depending on exact composition and processing route.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Modulus of elasticity (E) | 210 | GPa | Room temperature; longitudinal |
| Shear modulus (G) | approx. 80 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.3 | – | Elastic range, room temperature |
| Thermal expansion coefficient (α) | 12.0 | 10⁻⁶/K | 20 °C to 100 °C |
| Thermal conductivity (λ) | 51.9 | W/(m·K) | At 20 °C |
| Specific heat capacity (cₚ) | 486 | J/(kg·K) | At 20 °C |
| Electrical resistivity (ρₑ) | 0.20 | μΩ·m | At 20 °C |
EN 10149-2 S460MC Steel Mechanical Properties
Minimum mechanical properties as specified in EN 10149-2 for S460MC. The yield and tensile strengths apply to the delivery condition. Elongation values refer to longitudinal specimens, while bending tests are typically performed on transverse samples. For thicknesses above 16 mm, slightly reduced yield strength values may apply; consult the full standard. Impact properties are optional and must be agreed at the time of ordering.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength (ReH) | ≥ 460 | MPa | Thickness ≤ 16 mm |
| Tensile strength (Rm) | 520 – 670 | MPa | Thickness ≤ 16 mm |
| Elongation A80 | ≥ 14 | % | Longitudinal, thickness < 3 mm, gauge length 80 mm |
| Elongation A5 | ≥ 17 | % | Longitudinal, thickness ≥ 3 mm, gauge length 5.65√S₀ |
| Bending (180°) – bend diameter when thickness ≤ 3 mm | 0 t | – | Transverse test piece, t = specimen thickness |
| Bending (180°) – bend diameter when 3 < thickness ≤ 6 mm | 0.5 t | – | Transverse test piece |
| Bending (180°) – bend diameter when thickness > 6 mm | 1.0 t | – | Transverse test piece |
EN 10149-2 S460MC Steel Fully Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S460MC | Original specification |
| International | ISO 6930-2 | S460MC | Technically identical to EN 10149-2 |
| Germany | DIN EN 10149-2 | S460MC | Direct adoption of European standard |
| United Kingdom | BS EN 10149-2 | S460MC | Direct adoption of European standard |
EN 10149-2 S460MC Steel Application Introduction
S460MC is engineered for weight-critical, high-stress components that require excellent cold formability and consistent mechanical properties. It is widely adopted in the automotive sector to achieve lightweight design without compromising crash safety. The steel can be readily formed by bending, deep drawing or profile rolling, and is fully weldable with standard processes.
Product Applications: Passenger car chassis and subframes, Longitudinal and cross beams for trucks, Suspension arms, spring brackets and stabiliser bars, Wheel rims and wheel discs, Seat rails and seat structure reinforcements, Bumper reinforcements and door intrusion beams
Processed into products: Stamped chassis members, Cold-formed hollow sections, Welded assemblies and brackets, Laser-cut blanks for further forming, Roll-formed profiles for body structures
Application industries: Automotive manufacturing, Commercial vehicle construction, Trailer and body building, Agricultural and construction machinery, Railway vehicle components
EN 10149-2 S460MC Steel Similar or Alternative Materials with Comparable Performance
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S420MC | Lower minimum yield strength (420 MPa); otherwise similar chemistry and application scope |
| Europe | EN 10149-2 | S500MC | Higher minimum yield strength (500 MPa); may require adjusted forming parameters |
| Europe | EN 10149-2 (historic) | QStE460TM | Predecessor designation; S460MC is the current designation under EN 10149-2 |
| USA | ASTM A1011/A1011M | HSLAS Grade 65 Class 2 | Minimum yield strength 450 MPa; similar strength level but different chemistry and dimensional tolerances |
| China | GB/T 20887.1 | HR460MC | Comparable 460 MPa grade for cold forming; verify specific mechanical requirements |
Notes:
- If impact toughness is required for the application, the ordering documents must specify the test temperature (e.g. 20 °C, 0 °C, -20 °C) and the minimum absorbed energy, as EN 10149-2 offers the possibility to agree on Charpy V-notch values.
- For improved surface quality, the material can be supplied as pickled and oiled.
- Maximum permissible thickness for guaranteed mechanical properties may be limited; for thicknesses above 16 mm, slight reductions in yield strength are accepted (refer to the standard).
- S460MC can be galvanised or coated, but the effect of the coating process on mechanical properties must be evaluated.
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