EN 10149-2 S550MC Hot-Rolled Steel for Automotive Cold Forming
EN 10149-2 S550MC Hot-Rolled Steel for Automotive Cold Forming - High Yield Strength
Detailed material data for EN 10149-2 S550MC steel including chemical composition, mechanical properties, physical properties, equivalent grades, and application guide for automotive structural components.
Cold forming, bending, flanging, welding, machining
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EN 10149-2 S550MC Hot-Rolled Steel for Automotive Cold Forming Introduction
S550MC is a hot-rolled high yield strength steel for cold forming, standardized in EN 10149-2. The "MC" designation indicates thermomechanical rolling, which provides excellent formability and weldability combined with a minimum yield strength of 550 MPa. Typical applications include automotive structural parts that require high strength, good fatigue resistance, and crash performance.
- Minimum yield strength 550 MPa for thicknesses up to 8 mm
- Tensile strength range 600–760 MPa
- Good cold formability and weldability
- Delivered in thermomechanically rolled (+M) condition
EN 10149-2 S550MC Hot-Rolled Steel for Automotive Cold Forming Chemical Composition
Ladle analysis according to EN 10149-2 for grade S550MC. All values are maximum limits unless otherwise stated. The combination of microalloying elements (Nb, V, Ti) provides grain refinement and precipitation strengthening without impairing cold formability.
| Chemical Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | ≤ 0.12 | |
| Si | ≤ 0.50 | |
| Mn | ≤ 1.80 | |
| P | ≤ 0.025 | |
| S | ≤ 0.015 | |
| Altotal | ≥ 0.015 | Minimum required |
| Nb | ≤ 0.09 | Microalloying element |
| V | ≤ 0.20 | Microalloying element |
| Ti | ≤ 0.15 | Microalloying element |
| Mo | ≤ 0.50 | |
| B | ≤ 0.005 |
EN 10149-2 S550MC Hot-Rolled Steel for Automotive Cold Forming Thermal and Electrical Physical Properties
These values are not specified in EN 10149-2 but represent typical properties for hot-rolled high-strength low-alloy steels similar to S550MC. Actual values may vary slightly with exact composition and processing.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Elastic modulus (E) | 210 | GPa | Room temperature |
| Shear modulus (G) | approx. 80 | GPa | Room temperature |
| Poisson's ratio (ν) | 0.3 | - | Room temperature |
| Thermal expansion coefficient (α) | 12 × 10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal conductivity (λ) | approx. 50 | W/(m·K) | Room temperature |
| Specific heat capacity (c) | approx. 460 | J/(kg·K) | Room temperature |
| Electrical resistivity (ρ_e) | approx. 0.2 | µΩ·m | Room temperature |
EN 10149-2 S550MC Hot-Rolled Steel for Automotive Cold Forming Mechanical Properties
Transverse test pieces according to EN 10149-2. Properties apply for products in the delivery condition (+M). Bend test is mandatory; impact energy is not specified for this grade unless agreed upon at the time of ordering.
| Property | Standard Requirement Value | Unit | Test Condition / Thickness |
|---|---|---|---|
| Yield strength (ReH) | min 550 | MPa | Transverse; 1.5 mm ≤ t ≤ 3 mm |
| Yield strength (ReH) | min 550 | MPa | Transverse; 3 mm < t ≤ 8 mm |
| Tensile strength (Rm) | 600 – 760 | MPa | Transverse; 1.5 mm ≤ t ≤ 3 mm |
| Tensile strength (Rm) | 600 – 760 | MPa | Transverse; 3 mm < t ≤ 8 mm |
| Elongation after fracture (A80) | min 12 | % | Transverse; gauge length 80 mm; t ≤ 3 mm |
| Elongation after fracture (A5) | min 14 | % | Transverse; gauge length 5.65√S0; 3 mm < t ≤ 8 mm |
| Bend test | mandrel dia. = 0.5 t | - | 180° bend; t ≤ 8 mm |
EN 10149-2 S550MC Hot-Rolled Steel for Automotive Cold Forming Exact Equivalent Standards and Replaceable Grades
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S550MC | Original standard; thermomechanically rolled |
| Germany | DIN EN 10149-2 | S550MC | Identical European adoption |
| United Kingdom | BS EN 10149-2 | S550MC | Identical European adoption |
| France | NF EN 10149-2 | S550MC | Identical European adoption |
| Italy | UNI EN 10149-2 | S550MC | Identical European adoption |
EN 10149-2 S550MC Hot-Rolled Steel for Automotive Cold Forming Application Introduction
S550MC is widely used in the automotive industry for cold-formed structural and chassis parts that require high strength and good fatigue resistance. The thermomechanical rolling process ensures consistent mechanical properties and excellent bendability. The steel can be joined by conventional spot welding, MIG/MAG welding, and laser welding without significant loss of strength in the heat-affected zone.
Product Applications: Chassis frames and subframes, Side impact beams, Bumper reinforcements, Suspension arms and spring supports, Engine cradles, Cross members and longitudinal beams, Cold-formed profiles for structural applications
Processed into products: Lower control arms, Trailing arms, Subframe assembly brackets, Reinforcement plates for wheel arches, Seat cross members, Steering knuckle supports, Frame rails and cross-braces
Application industries: Automotive and light commercial vehicles, Trailer and body building, Construction machinery, Agricultural equipment
EN 10149-2 S550MC Hot-Rolled Steel for Automotive Cold Forming Similar / Alternative Material Recommendations
| Country / Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A656/A656M | Grade 80 | Hot-rolled HSLA steel; minimum YS 550 MPa; compare chemical and delivery conditions |
| USA | ASTM A1011/A1011M | HSLAS-F Grade 550 | Sheet; similar YS formability; verify thickness range and mechanical limits |
| Japan | JIS G 3135 | SPFH590 | Hot-rolled high-strength steel sheet with improved formability; higher YS, similar applications |
| China | GB/T 20887.2 | HR780F | Not identical; classification and YS range overlap; careful substitution needed |
Notes:
The material is not intended for heat treatment after forming. If stress relief is required, carry out at temperatures below 580 °C to avoid strength loss. For applications requiring improved atmospheric corrosion resistance, a coated alternative (e.g., galvanized) should be selected. Always consult the mill certificate for actual properties of a specific heat.
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