S700MC Hot Rolled Steel Coil
S700MC Hot Rolled Steel Coil - EN 10149-2: High-Strength Cold-Forming Steel
Comprehensive material analysis of BS EN 10149-2 S700MC thermomechanically rolled hot-rolled steel coil for cold forming applications.
Cold forming, bending, roll forming, stamping, welding, drilling, machining
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S700MC Hot Rolled Steel Coil Introduction
S700MC is a thermomechanically rolled high-strength low-alloy (HSLA) steel specified in BS EN 10149-2. It achieves a minimum yield strength of 700 MPa in thin gauges, combined with good cold formability and weldability. The fine-grained microstructure, obtained through controlled rolling and microalloying, provides an excellent balance of strength and ductility.
- Designed for cold-formed structural components where weight reduction and high load capacity are critical.
- Commonly supplied in coil or cut-to-length sheet form, with thicknesses up to 20 mm.
- Widely used in automotive chassis, crane booms, and heavy vehicle frames.
- Microalloying with niobium, vanadium, and titanium ensures grain refinement and precipitation hardening.
- The steel is not intended for subsequent heat treatment to increase strength; the mechanical properties are achieved in the as-rolled condition.
S700MC Hot Rolled Steel Coil Chemical Composition
The chemical composition complies with EN 10149-2:2013 for grade S700MC. Microalloying elements (Nb, V, Ti) are added to control grain size and provide precipitation strengthening. Aluminium is used for deoxidation and grain refinement. Boron may be added to improve hardenability and weldability.
| Element | Standard Value | Remarks |
|---|---|---|
| C | ≤ 0.12 | Max. carbon content |
| Si | ≤ 0.60 | Silicon, improves strength |
| Mn | ≤ 2.10 | Manganese, essential hardenability element |
| P | ≤ 0.025 | Phosphorus, maximum limit |
| S | ≤ 0.015 | Sulfur, maximum limit |
| Al (total) | ≥ 0.015 | Aluminium, grain refinement |
| Nb | ≤ 0.09 | Niobium, microalloying element |
| V | ≤ 0.20 | Vanadium, microalloying element |
| Ti | ≤ 0.22 | Titanium, microalloying element |
| Mo | ≤ 0.50 | Molybdenum, optional |
| B | ≤ 0.005 | Boron, optional |
| N | ≤ 0.015 | Nitrogen, typically controlled |
S700MC Hot Rolled Steel Coil Physical Properties
The following physical properties are typical for high-strength low-alloy steel and can be used for engineering calculations. Actual values may vary slightly depending on the exact chemical composition and processing history. These values are not guaranteed by the material standard but are representative for S700MC.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density ρ | 7.85 | g/cm³ | At 20 °C |
| Modulus of elasticity E | 210 | GPa | At 20 °C |
| Shear modulus G | 80 | GPa | At 20 °C |
| Poisson's ratio ν | 0.3 | — | At 20 °C |
| Thermal expansion coefficient α | 12 × 10⁻⁶ | /K | 20 – 100 °C |
| Thermal conductivity λ | 50 | W/(m·K) | At 20 °C |
| Specific heat capacity c | 460 | J/(kg·K) | At 20 °C |
| Electrical resistivity ρe | 0.2 × 10⁻⁶ | Ω·m | At 20 °C |
S700MC Hot Rolled Steel Coil Mechanical Properties
Mechanical properties are guaranteed as per EN 10149-2:2013 at room temperature, using transverse test pieces. The values depend on the nominal thickness (t) of the product. The yield strength is the upper yield point (ReH) or 0.2% proof strength. Elongation is measured on a proportional gauge length (A5 for t ≥ 3 mm, A80 for t < 3 mm). Bending tests may be agreed upon at the time of ordering.
| Property | Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield strength ReH | Min. 700 | MPa | t ≤ 3 mm |
| Yield strength ReH | Min. 680 | MPa | 3 < t ≤ 8 mm |
| Yield strength ReH | Min. 660 | MPa | 8 < t ≤ 12 mm |
| Yield strength ReH | Min. 640 | MPa | 12 < t ≤ 20 mm |
| Tensile strength Rm | 750 – 950 | MPa | t ≤ 3 mm |
| Tensile strength Rm | 750 – 950 | MPa | 3 < t ≤ 12 mm |
| Tensile strength Rm | 700 – 950 | MPa | 12 < t ≤ 20 mm |
| Elongation A80 | Min. 10 | % | t < 3 mm |
| Elongation A5 | Min. 12 | % | 3 mm ≤ t ≤ 20 mm |
S700MC Hot Rolled Steel Coil Fully Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S700MC | Original European standard |
| United Kingdom | BS EN 10149-2 | S700MC | British adoption |
| Germany | DIN EN 10149-2 | S700MC | German adoption |
| France | NF EN 10149-2 | S700MC | French adoption |
| Italy | UNI EN 10149-2 | S700MC | Italian adoption |
| Spain | UNE EN 10149-2 | S700MC | Spanish adoption |
| Sweden | SS EN 10149-2 | S700MC | Swedish adoption |
S700MC Hot Rolled Steel Coil Application Introduction
S700MC is particularly suitable for cold-formed components that require high load-bearing capacity combined with weight savings. The steel can be bent, roll-formed, and drawn without cracking when adequate bending radii are observed. Welding is possible with all common methods, though heat input should be controlled to preserve the thermomechanically treated structure.
- Typical manufacturing processes: press braking, roll forming, tube welding, robotic welding, laser cutting.
- Corrosion protection: the steel is usually coated (painted, galvanized) as supplied or after fabrication.
- Fatigue performance is excellent, making it ideal for dynamic applications.
Product Applications: Truck chassis frames, Crane booms and outriggers, Trailer chassis and subframes, Structural hollow sections (rectangular, circular), Bumper reinforcement beams, Seat frames and safety components, Cold-formed profiles (C, U, Z sections), Agricultural implement frames, Warehouse racking systems, Wind turbine tower internals
Processed into products: Longitudinal and cross members, Flanges and brackets, Reinforcement plates, Welded box sections, Roll-formed channels and angles, Pipe and tube products, Cut and bent parts from coil
Application industries: Automotive, Commercial vehicles and trailers, Construction and earthmoving machinery, Agricultural equipment, Material handling and logistics, Energy (wind turbine towers, offshore structures), Railway components
S700MC Hot Rolled Steel Coil Similar / Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S650MC | Lower yield strength (min. 650 MPa); similar applications |
| Europe | EN 10149-2 | QStE700TM | Old designation, equivalent properties |
| Europe | ISO 6930-2 | HR700MC | International standard, comparable but not identical |
| USA | ASTM A1011 / A1011M | HSLAS Grade 100 [690] | Hot-rolled HSLA steel, yield ≈690 MPa |
| USA | ASTM A656 / A656M | Grade 80 | High-strength low-alloy, yield ≈550 MPa |
| Japan | JIS G 3113 | SAPH440 | Automotive steel, lower strength (≥440 MPa) |
| China | GB/T 1591 | Q690D | High-strength structural steel, similar yield |
Notes:
- S700MC is not designed for quench and temper heat treatments; its properties are developed through controlled rolling.
- When welding, low-hydrogen processes and preheating may be required for thicker sections to avoid cold cracking.
- The minimum bending radius for cold forming should be at least 2t (where t = thickness) in the transverse direction; tighter radii may require hot forming or annealing.
- Material is often ordered with option 12 (improved surface) or 15 (pickled) for demanding surface quality applications.
- CEV (carbon equivalent) is typically 0.45–0.55, indicating good weldability with appropriate procedures.
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