BS EN 10149-2 S355MC Hot Rolled Steel Coil
BS EN 10149-2 S355MC Hot Rolled Steel Coil - High Yield Cold Forming Steel
Detailed material data for S355MC hot rolled steel coil according to EN 10149-2, including chemical composition, mechanical properties, and physical properties.
Cold forming, bending, stamping, roll forming, welding, cutting
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BS EN 10149-2 S355MC Hot Rolled Steel Coil Introduction
S355MC is a thermomechanically rolled high yield strength steel for cold forming, specified in BS EN 10149-2:2013. It offers a minimum yield strength of 355 MPa and excellent cold formability, making it ideal for structural and automotive applications where weight reduction and high strength are critical. The thermomechanical rolling process refines grain structure, providing a fine balance of strength, toughness, and weldability without the need for subsequent heat treatment. Typical uses include chassis components, cold-formed profiles, and structural hollow sections.
BS EN 10149-2 S355MC Hot Rolled Steel Coil Chemical Composition
The chemical composition meets the requirements of EN 10149-2 for grade S355MC. All values are maximum unless a range is specified. The steel is fully killed with a minimum aluminium content to ensure fine grain structure. Microalloying elements (Nb, V, Ti) are controlled for grain refinement and precipitation strengthening. The sum of Nb+V+Ti is limited to 0.22% max to maintain consistent formability.
| Element | Standard Value (max %) | Remarks |
|---|---|---|
| C | 0.12 | |
| Si | 0.50 | |
| Mn | 1.50 | |
| P | 0.025 | |
| S | 0.020 | |
| Altotal | ≥ 0.015 | Minimum for fine grain practice |
| Nb | 0.09 | |
| V | 0.20 | |
| Ti | 0.15 | |
| Nb+V+Ti | 0.22 | Maximum combined content |
BS EN 10149-2 S355MC Hot Rolled Steel Coil Thermal and Electrical Physical Properties
Physical properties are typical for low-carbon high-strength steels and are influenced by microstructure. These values are not mandatory in EN 10149-2 but are representative for design calculations. Thermal expansion and conductivity vary with temperature; values given at room temperature or 20–100°C range unless otherwise stated. Electrical resistivity is typical for this grade.
| Property | Standard Required Value (Typical) | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | ~7.85 | kg/dm³ | Room temperature |
| Elastic modulus (E) | ~210 | GPa | Room temperature |
| Shear modulus (G) | ~80 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | ~0.3 | — | Elastic range |
| Thermal expansion coefficient (α) | ~12 × 10⁻⁶ | 1/K | 20–100 °C |
| ~13 × 10⁻⁶ | 1/K | 20–200 °C | |
| ~14 × 10⁻⁶ | 1/K | 20–400 °C | |
| Thermal conductivity (λ) | ~50 | W/(m·K) | At 20 °C |
| ~48 | W/(m·K) | At 100 °C | |
| Specific heat capacity | ~460 | J/(kg·K) | Room temperature |
| Electrical resistivity (ρe) | ~0.20 – 0.25 | Ω·mm²/m | At 20 °C |
BS EN 10149-2 S355MC Hot Rolled Steel Coil Mechanical Properties
Mechanical properties are valid for thermomechanically rolled condition (+M) and tested in accordance with EN 10149-2. Values depend on product thickness. For thicknesses not covered, the nearest range applies. The tensile test is performed transverse to the rolling direction using proportional test pieces (80 mm gauge length for thickness <3 mm, 5.65√S₀ for ≥3 mm). Bend tests are conducted at 180° with the specified mandrel diameter.
| Property | Standard Required Value | Unit | Test Condition / Thickness Range |
|---|---|---|---|
| Yield strength (ReH) | ≥ 355 | MPa | t ≤ 16 mm |
| ≥ 345 | MPa | 16 < t ≤ 40 mm | |
| ≥ 335 | MPa | 40 < t ≤ 63 mm | |
| Tensile strength (Rm) | 430 – 550 | MPa | t ≤ 16 mm |
| 400 – 520 | MPa | 16 < t ≤ 40 mm | |
| 380 – 500 | MPa | 40 < t ≤ 63 mm | |
| Elongation (A80) | ≥ 23 | % | t < 3 mm (80 mm gauge) |
| Elongation (A5) | ≥ 19 | % | 3 ≤ t ≤ 16 mm |
| ≥ 18 | % | 16 < t ≤ 40 mm | |
| ≥ 17 | % | 40 < t ≤ 63 mm | |
| Bend test (180°) | Mandrel diameter 0.5t | — | t ≤ 8 mm |
| Mandrel diameter 1.0t | — | 8 < t ≤ 16 mm | |
| Mandrel diameter 1.5t | — | t > 16 mm |
BS EN 10149-2 S355MC Hot Rolled Steel Coil Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe (EU) | EN 10149-2 | S355MC | Identical – base standard |
| Germany | DIN EN 10149-2 | S355MC | Direct adoption of EN |
| France | NF EN 10149-2 | S355MC | Direct adoption of EN |
| United Kingdom | BS EN 10149-2 | S355MC | Direct adoption of EN (current title) |
| Italy | UNI EN 10149-2 | S355MC | Direct adoption of EN |
| International | ISO 6930-2 | FeE355MC | Proposed equivalent, similar technical requirements |
BS EN 10149-2 S355MC Hot Rolled Steel Coil Application Introduction
S355MC is engineered for cold forming operations that demand high strength after forming. It is widely used in weight-sensitive structures where welding and fatigue performance are important. The thermomechanical rolling ensures excellent surface quality and thickness tolerances, enabling consistent parts production.
Product Applications: Vehicle chassis and subframes, Longitudinal beams and cross members, Wheel rims and disc wheels, Cold-formed hollow sections (e.g., for cranes, trailers), Poles and masts, Storage racking systems
Processed into products: Stamped and bent brackets, Formed side members, Reinforcement plates, Roll-formed sections, Welded assemblies (with conventional welding methods), Cabin structures and roll bars
Application industries: Automotive and light truck manufacturing, Railway and transport systems, Construction and earth-moving machinery, Agricultural equipment, General engineering and metal fabrication
BS EN 10149-2 S355MC Hot Rolled Steel Coil Similar or Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S420MC | Higher yield strength (420 MPa), similar formability |
| Europe | EN 10149-2 | S315MC | Lower yield strength (315 MPa), excellent formability |
| China | GB/T 20887.1 | QStE340TM | Comparable yield (340 MPa) and formability, similar chemistry |
| Japan | JIS G3113 | SAPH440 | Yield strength ~275–305 MPa, lower than S355MC, but similar processing |
| USA | ASTM A1011/A1011M | HSLAS Grade 50 Class 1 | Yield 340 MPa, slightly lower, but similar hot-rolled HSLAS steel |
Notes:
For impact toughness requirements, an additional agreement with the producer is necessary, as EN 10149-2 does not specify mandatory Charpy values. The steel is suitable for galvanizing. Dimensions and tolerances follow EN 10131 and EN 10051. If cold forming involves severe stretching, bend radii should follow the recommendations of the standard to avoid cracking.
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