EN 10149-2 S500MC
EN 10149-2 S500MC: High-Strength Low-Alloy Automobile Structural Steel Plate for Cold Forming
Comprehensive technical data for S500MC hot-rolled steel according to EN 10149-2, including chemical composition, mechanical and physical properties, international equivalents, and application guidance for automotive structural components.
Cold forming, bending, stamping, welding, cutting, punching
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EN 10149-2 S500MC Introduction
S500MC is a thermomechanically rolled, high-yield-strength steel for cold forming, specified in EN 10149-2. It belongs to the group of weldable fine-grain structural steels with a minimum yield strength of 500 MPa for thicknesses up to 16 mm.
- Excellent cold formability combined with high strength, enabling weight reduction in automotive structures.
- Good weldability due to low carbon equivalent and microalloying (Nb, V, Ti).
- Typically delivered in the as-rolled or thermomechanically rolled condition, sometimes with a controlled cooling.
Its balanced mechanical properties make it ideal for chassis and structural parts where high load capacity and good fatigue resistance are required.
EN 10149-2 S500MC Chemical Composition
The chemical composition complies with EN 10149-2:2013. The steel is microalloyed with niobium, vanadium, and/or titanium to achieve grain refinement and precipitation strengthening. A minimum aluminum content ensures adequate nitrogen binding.
- Low carbon content helps maintain good weldability.
- Sulfur and phosphorus are tightly controlled to enhance toughness and formability.
| Element | Standard Value (max unless range) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.12 | Increases strength but reduces weldability and formability |
| Silicon (Si) | ≤ 0.50 | Deoxidizer, improves strength |
| Manganese (Mn) | ≤ 1.70 | Improves hardenability and strength |
| Phosphorus (P) | ≤ 0.025 | Controlled for toughness |
| Sulfur (S) | ≤ 0.015 | Low sulfur for improved formability and welding |
| Aluminum (Al total) | ≥ 0.015 | Grain refinement and nitrogen fixation |
| Niobium (Nb) | ≤ 0.09 | Microalloying element for grain refinement and precipitation strengthening |
| Vanadium (V) | ≤ 0.20 | Microalloying element, contributes to strength |
| Titanium (Ti) | ≤ 0.15 | Microalloying element, forms carbides/nitrides |
| Nb+V+Ti | ≤ 0.22 | Sum of microalloying elements, as per standard |
EN 10149-2 S500MC Thermal and Electrical Physical Properties
The following physical properties are typical for low-alloy structural steels and can be used for engineering calculations. Actual values may vary slightly depending on the exact chemical composition and processing conditions.
- Thermal expansion coefficient is valid in the temperature range 20–100 °C.
- Thermal conductivity and electrical resistivity are given at room temperature.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Elastic Modulus (E) | 210 | GPa | 20 °C |
| Shear Modulus (G) | ≈ 80.8 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.3 | – | Elastic range |
| Thermal Expansion Coefficient (α) | 12.0 × 10⁻⁶ | K⁻¹ | 20–100 °C |
| Thermal Conductivity (λ) | ≈ 50 | W/(m·K) | 20 °C |
| Specific Heat Capacity (cp) | ≈ 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρ_e) | ≈ 0.15 – 0.25 | Ω·mm²/m | 20 °C |
EN 10149-2 S500MC Mechanical Properties
The following mechanical properties are specified for flat products of thickness ≤ 16 mm at room temperature, in accordance with EN 10149-2.
- Impact test values are guaranteed in longitudinal direction at -20 °C.
- Bend test requirements depend on thickness; for e ≤ 16 mm the mandrel diameter is 0.5t (t = thickness).
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 500 | MPa | e ≤ 16 mm, transverse |
| Tensile Strength (Rm) | 550 – 700 | MPa | e ≤ 16 mm, transverse |
| Elongation (A80) | ≥ 12 | % | e < 3 mm, longitudinal |
| Elongation (A5) | ≥ 14 | % | 3 mm ≤ e ≤ 16 mm, longitudinal |
| Bend Test (180°) | Mandrel diameter 0.5t | – | e ≤ 16 mm; no cracks |
| Impact Energy (KV) | ≥ 40 | J | -20 °C, longitudinal, V-notch |
EN 10149-2 S500MC Completely Equivalent Material Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S500MC | Original designation; thermomechanically rolled |
| Germany | DIN EN 10149-2 | S500MC | Adopted EN standard |
| France | NF EN 10149-2 | S500MC | Adopted EN standard |
| UK | BS EN 10149-2 | S500MC | Adopted EN standard |
| Italy | UNI EN 10149-2 | S500MC | Adopted EN standard |
| Spain | UNE EN 10149-2 | S500MC | Adopted EN standard |
| International (ISO) | ISO 6930-2 | FeE500HR | Equivalent to S500MC; HR indicates hot rolled |
| China | GB/T 20887.1 | HR500F | Comparable high-yield steel for cold forming |
EN 10149-2 S500MC Application Introduction
S500MC is especially designed for cold-formed structural components that require a combination of high strength, good weldability, and excellent dimensional accuracy. Typical applications include automotive chassis parts, crane booms, and agricultural machinery frames. It can be processed by laser cutting, plasma cutting, bending, and stamping. The steel is not intended for heat treatment by the customer, as the mechanical properties are obtained through the thermomechanical rolling process.
Product Applications: Truck chassis frames and cross members, Passenger car longitudinal beams and reinforcements, Trailer and semi-trailer structural parts, Crane booms and outriggers, Agricultural machinery chassis, Container corner castings and frames
Processed into products: Chassis side rails and cross members, Suspension control arms and brackets, Axle beams and support structures, Cold-bent profiles for structural frameworks, Stamped floor panels and reinforcements, Welded tubular components (after roll forming)
Application industries: Automotive and transportation, Construction machinery, Agricultural equipment, Crane and lifting equipment, Railway vehicles
EN 10149-2 S500MC Similar/Near-Equivalent Materials Recommendation
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S550MC | Higher minimum yield strength (550 MPa), slightly reduced formability |
| Europe | EN 10149-2 | S460MC | Lower strength (460 MPa), better formability |
| China | GB/T 20564.5 | QStE500TM | Similar thermomechanically rolled high-strength steel |
| Japan | JIS G 3134 | SPFH590 | Hot-rolled high-strength steel sheet with comparable tensile strength; typical YS ≥ 460 MPa |
Notes:
Welding: S500MC can be welded by all common methods, including MAG/MIG, resistance spot welding, and laser welding. Preheating is generally not required for thicknesses up to 20 mm. Surface condition: Normally supplied with a mill finish; oiled or pickled surfaces are available upon request. Tolerances: Thickness tolerances according to EN 10051, flatness tolerances as per EN 10029 or agreement.
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