BS EN 10149-2 S550MC Hot Rolled Steel Coil
BS EN 10149-2 S550MC Hot Rolled Steel Coil - High-Strength Low-Alloy Cold-Forming Steel
Comprehensive material data, chemical composition, mechanical and physical properties for S550MC hot rolled steel coil per BS EN 10149-2. Includes fully equivalent grades and similar alternatives with application guide.
Cold forming, bending, pressing, welding, cutting, punching
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BS EN 10149-2 S550MC Hot Rolled Steel Coil Introduction
S550MC is a thermomechanically rolled, high-strength low-alloy (HSLA) steel for cold forming, specified in BS EN 10149-2:2013. It offers a minimum yield strength of 550 MPa in the as-delivered condition, combined with excellent cold formability, weldability, and good toughness. The 'MC' designation indicates it is produced by thermomechanical rolling, achieving fine grain structure and optimised mechanical properties.
- Suitable for complex cold-formed components in the automotive, construction, and general engineering sectors.
- Typical applications include structural members, chassis parts, reinforcement profiles, and safety-related elements where weight reduction and high strength are critical.
- Available as hot rolled coils, slit strips, or cut-to-length sheets in pickled and oiled or dry finish.
BS EN 10149-2 S550MC Hot Rolled Steel Coil Chemical Composition
The ladle analysis according to BS EN 10149-2:2013 ensures precise alloying for controlled strength and formability. Limits are maximum unless a range or minimum is indicated.
- Carbon is kept very low to maintain weldability and toughness.
- Microalloying elements (Nb, V, Ti) provide grain refinement and precipitation strengthening.
- The sum Nb+V+Ti is restricted to avoid excessive hardening.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| C (Carbon) | ≤ 0.12% | Low carbon for weldability |
| Mn (Manganese) | ≤ 1.80% | Solid solution strengthening |
| Si (Silicon) | ≤ 0.50% | Deoxidation, minor strengthening |
| P (Phosphorus) | ≤ 0.025% | Controlled for toughness |
| S (Sulfur) | ≤ 0.015% | Low to avoid hot shortness |
| Al (Aluminium, total) | ≥ 0.015% | Grain refinement, deoxidation |
| Nb (Niobium) | ≤ 0.09% | Maximum permitted; grain refiner and precipitation hardener |
| V (Vanadium) | ≤ 0.20% | Maximum permitted; precipitation strengthening |
| Ti (Titanium) | ≤ 0.15% | Maximum permitted; grain refinement and sulfide shape control |
| Nb+V+Ti | ≤ 0.22% | Sum of microalloying elements |
BS EN 10149-2 S550MC Hot Rolled Steel Coil Thermal and Electrical Physical Properties
Physical data are not part of the standard BS EN 10149-2 but represent common values for HSLA steels of this grade. The values are indicative and may vary slightly with processing. They are useful for engineering calculations.
- Thermal expansion and conductivity show typical steely behaviour.
- Electrical resistivity is representative for carbon-manganese steels.
| Property | Typical Value | Unit | Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7850 | kg/m³ | Room temperature |
| Elastic modulus (E) | 210 | GPa | Room temperature, static |
| Shear modulus (G) | 81 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.3 | — | Elastic range |
| Thermal expansion coefficient (α) | 12 × 10⁻⁶ | K⁻¹ | 20 – 100 °C |
| Thermal conductivity (λ) | 50 | W/(m·K) | At 20 °C, typical for HSLA |
| Specific heat capacity (Cp) | 460 | J/(kg·K) | At 20 °C |
| Electrical resistivity (ρ_e) | 0.20 | µΩ·m | At 20 °C |
BS EN 10149-2 S550MC Hot Rolled Steel Coil Mechanical Properties
Mechanical requirements are valid for test pieces oriented parallel to the rolling direction, in the as-delivered condition. Values depend on product thickness.
- Yield strength (ReH) and tensile strength (Rm) are determined according to EN ISO 6892-1.
- Elongation (A) uses proportional or non-proportional gauge lengths as indicated.
- Bending test according to EN ISO 7438 (mandrel diameter as a multiple of thickness).
- Impact properties are not mandatory; if required, they must be agreed at the time of enquiry and order.
| Property | Standard Value | Unit | Test Condition |
|---|---|---|---|
| Yield strength ReH | ≥ 550 | MPa | Thickness ≤ 12 mm |
| Yield strength ReH | ≥ 500 | MPa | Thickness 12 < t ≤ 16 mm |
| Yield strength ReH | ≥ 480 | MPa | Thickness 16 < t ≤ 20 mm |
| Tensile strength Rm | 600 – 760 | MPa | Thickness ≤ 16 mm |
| Tensile strength Rm | 560 – 720 | MPa | Thickness 16 < t ≤ 20 mm |
| Elongation A80 | ≥ 15 | % | Thickness ≤ 3 mm, gauge length 80 mm |
| Elongation A5 | ≥ 14 | % | Thickness ≤ 12 mm, proportional gauge length L0 = 5.65√S0 |
| Elongation A5 | ≥ 14 | % | Thickness 12 < t ≤ 16 mm, proportional gauge length L0 = 5.65√S0 |
| Elongation A5 | ≥ 13 | % | Thickness 16 < t ≤ 20 mm, proportional gauge length L0 = 5.65√S0 |
| Bend test (mandrel diameter) | 1 x t | — | Thickness ≤ 8 mm, 180° bend, no cracks |
| Bend test (mandrel diameter) | 2 x t | — | Thickness > 8 mm, 180° bend, no cracks |
| Impact energy (optional) | to be agreed | J | Upon order, e.g., -20°C, longitudinal specimens |
BS EN 10149-2 S550MC Hot Rolled Steel Coil Fully Equivalent Material Standards and Replaceable Grade Designations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe (EN) | EN 10149-2 | S550MC | Original European standard, identical |
| United Kingdom (BS) | BS EN 10149-2 | S550MC | British adoption, identical |
| Germany (DIN) | DIN EN 10149-2 | S550MC | German edition, identical |
| France (NF) | NF EN 10149-2 | S550MC | French edition, identical |
| Italy (UNI) | UNI EN 10149-2 | S550MC | Italian edition, identical |
| Spain (UNE) | UNE EN 10149-2 | S550MC | Spanish edition, identical |
| International (ISO) | ISO 6930-1 | S550MC | ISO standard, technically identical |
| Sweden (SS) | SS-EN 10149-2 | S550MC | Swedish adoption, identical |
| Austria (ÖNORM) | ÖNORM EN 10149-2 | S550MC | Austrian adoption, identical |
| Netherlands (NEN) | NEN-EN 10149-2 | S550MC | Dutch adoption, identical |
BS EN 10149-2 S550MC Hot Rolled Steel Coil Application Introduction
S550MC is designed for cold-formed structural and safety components where high strength, good formability, and reliable toughness are required. Its thermomechanically rolled microstructure provides excellent consistency. The material is readily processed by laser/plasma/water-jet cutting, bending, drawing, and robot welding. Typical products and applications include:
Product Applications: Automotive structural and safety parts (bumper beams, door intrusion beams, seat frames), Roll-formed profiles (cable trays, racking systems), Welded tubes and hollow sections for structural use, Stamped and bent chassis members, Cold-punched brackets and reinforcements
Processed into products: Bumper reinforcement beams, Body-in-white (BIW) structural members, Suspension arms and spring brackets, Cross members and longitudinal beams in truck frames, Forklift masts and boom segments, Construction equipment arms, Agricultural implement frames, Drawbar and coupling components
Application industries: Automotive (passenger cars, commercial vehicles), Construction and building (structural hollow sections, purlins), Agricultural and forestry machinery, Material handling and lifting equipment, Transportation (truck frames, trailer components)
BS EN 10149-2 S550MC Hot Rolled Steel Coil Similar / Approximate Replacement Materials from Other Standards
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A1011/A1011M | HSLAS Grade 70 [480] | Similar yield strength class, but min YS 480 MPa; carbon slightly higher; not directly identical |
| Japan | JIS G 3134 | SPFH590 | High-strength hot rolled steel sheet with improved formability; min tensile 590 MPa; yield strength not specified but typically in range 450–550 MPa; approximate substitute |
| China | GB/T 20887.1 | HR500L | Hot-rolled pickled steel for automotive use; min YS 500 MPa; close but lower minimum yield |
| Korea | KS D 3514 | SPFH540 | Similar to JIS SPFH540; min tensile 540 MPa; lower strength than S550MC, may be acceptable in less demanding designs |
| Europe | EN 10149-2 | S500MC | Immediate lower grade in the same standard; min YS 500 MPa; can be a direct substitute where 550 MPa not required |
| Europe | EN 10149-2 | S600MC | Immediate higher grade in the same standard; min YS 600 MPa; over-strength alternative |
Notes:
- The base material is typically supplied with trimmed edges and in pickled and oiled condition to prevent corrosion during storage and to facilitate forming.
- For improved cold formability, a smooth surface finish without scale is recommended, hence pickling is applied.
- Welding: All common methods are suitable (MAG, resistance spot, laser). No preheating is generally required due to low carbon content.
- Impact toughness: If required, the verification of absorbed energy shall be agreed at the time of order. Typical values for S550MC at -20 °C (longitudinal Charpy V-notch) can reach 40 J but must be specified.
- Tolerances on dimensions and shape follow EN 10051 and EN 10131, respectively.
- Marking and documentation: The product is accompanied by an inspection certificate 2.2 or 3.1 according to EN 10204, stating the chemical composition and mechanical test results.
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