S420NC Hot Rolled Steel Coil
BS EN 10149-3 S420NC Hot Rolled Steel Coil – High Yield Strength for Cold Forming
Comprehensive technical data for S420NC hot rolled steel coil under BS EN 10149-3. Includes chemical composition, mechanical and physical properties, equivalent grades, and application guidance for structural cold forming.
Cold forming (bending, stamping, drawing, roll forming), welding (all conventional methods), shearing, punching, laser/plasma cutting, machining
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S420NC Hot Rolled Steel Coil Introduction
S420NC is a high-strength low-alloy (HSLA) steel grade from BS EN 10149-3, supplied as hot rolled coil or cut lengths. It belongs to the normalized or normalized rolled delivery condition category intended for cold forming. The designation S420NC indicates a minimum yield strength of 420 MPa, with the suffix NC standing for 'non-alloy or alloy fine grain steel for cold forming'. Typical characteristics include excellent weldability, good cold formability, consistent mechanical properties, and good toughness at low temperatures. The fine grain structure achieved via normalized rolling ensures uniform properties across the section. It is widely used in structural and transport applications where reduced weight combined with high strength is essential, and its guaranteed impact energy at -20°C makes it suitable for safety-critical dynamic components.
S420NC Hot Rolled Steel Coil Chemical Composition
The chemical composition of S420NC is tightly controlled to achieve a fine grain and high strength while maintaining excellent weldability. Microalloying elements such as niobium, vanadium, and titanium are used individually or in combination to provide grain refinement and precipitation strengthening. The sum of Nb+V+Ti is limited to ensure consistent formability.
| Element | Standard Value (max unless range) | Notes |
|---|---|---|
| Carbon (C) | ≤0.20 | Ladle analysis |
| Silicon (Si) | ≤0.60 | Ladle analysis |
| Manganese (Mn) | ≤1.60 | Ladle analysis |
| Phosphorus (P) | ≤0.030 | Ladle analysis |
| Sulfur (S) | ≤0.025 | Ladle analysis |
| Aluminium (Al total) | ≥0.015 | Minimum for fine grain practice |
| Niobium (Nb)* | ≤0.09 | Microalloying element, combined Nb+V+Ti ≤0.22% |
| Vanadium (V)* | ≤0.20 | Microalloying element, combined Nb+V+Ti ≤0.22% |
| Titanium (Ti)* | ≤0.15 | Microalloying element, combined Nb+V+Ti ≤0.22% |
| Nitrogen (N) | — | Not specified, but typically below 0.012% |
S420NC Hot Rolled Steel Coil Thermal and Electrical Physical Properties
The following data represent typical values for S420NC steel at room temperature (unless another range is indicated) and are provided for design and calculation reference. These properties are not subject to the delivery specification but are characteristic of ferritic-pearlitic HSLA steels with similar chemistry and processing history.
| Property | Typical Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20 °C |
| Elastic Modulus (E) | 210 | GPa | At 20 °C, static tensile loading |
| Shear Modulus (G) | 81 | GPa | Calculated from E and ν |
| Poisson's Ratio (ν) | 0.3 | – | Elastic range |
| Thermal Expansion Coefficient (α) | 11.7 | 10⁻⁶/K | 20 – 100 °C |
| 12.4 | 10⁻⁶/K | 20 – 200 °C | |
| 13.0 | 10⁻⁶/K | 20 – 300 °C | |
| Thermal Conductivity (λ) | 50 – 55 | W/(m·K) | At 20 °C |
| Specific Heat Capacity | ~460 | J/(kg·K) | At 20 °C |
| Electrical Resistivity (ρₑ) | 0.16 – 0.20 | µΩ·m | At 20 °C |
S420NC Hot Rolled Steel Coil Mechanical Properties
Mechanical properties are guaranteed in the normalized or normalized rolled delivery condition for longitudinal test pieces. The yield strength decreases with increasing thickness, while elongation remains practically constant. Bend test requirements confirm formability; no cracking shall occur at a 180° bend. Impact energy verification is optional and must be agreed upon at the time of order; when specified, a minimum of 40 J is required at -20 °C on longitudinal Charpy V-notch specimens.
| Property | Required Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥420 | MPa | Nominal thickness ≤ 16 mm |
| ≥400 | MPa | Nominal thickness 16 < t ≤ 40 mm | |
| ≥390 | MPa | Nominal thickness 40 < t ≤ 63 mm | |
| Tensile Strength (Rm) | 520 – 670 | MPa | Nominal thickness ≤ 63 mm |
| Elongation after Fracture (A) | ≥19 | % | Thickness < 3 mm, gauge length L0=80 mm |
| ≥19 | % | Thickness 3 ≤ t ≤ 63 mm, L0=5.65√S0 | |
| Bend Test (180° bend) | Mandrel dia ≤1.5t | – | Thickness ≤ 16 mm |
| Mandrel dia ≤2.0t | – | Thickness 16 < t ≤ 63 mm | |
| Impact Energy (KV), if specified | ≥40 | J | At -20 °C, longitudinal V-notch |
S420NC Hot Rolled Steel Coil Directly Equivalent Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe / UK | BS EN 10149-3 | S420NC | The reference grade for normalized/normalized rolled HSLA for cold forming. |
S420NC Hot Rolled Steel Coil Application Introduction
Owing to its balanced combination of strength, toughness, and cold formability, S420NC is ideally suited for manufacturing components that must withstand high static and dynamic loads while allowing cost-effective cold forming processes. It can be welded with all conventional methods without special preheating and maintains its properties after cutting and blanking. Typical uses span across several industries.
Product Applications: Chassis frames and subframes, Longitudinal beams and cross members, Crane booms and telescopic arms, Wheel rims and spoke wheels, Structural hollow sections and welded tubes, Racking systems and shelf profiles, Trailer undercarriages and drawbars
Processed into products: Cold-formed brackets and reinforcements, Stamped and pressed automotive panels, Bent profiles for structural frames, Welded assemblies and support structures, Pipe and tube fittings manufactured by cold bending, Boom sections and telescopic components
Application industries: Automotive and heavy truck manufacturing, Construction and earth-moving machinery, Agricultural equipment, Material handling and storage systems, General mechanical engineering
S420NC Hot Rolled Steel Coil Similar or Closely Related Alternative Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S420MC | Thermomechanically rolled; very similar strength and chemistry, but different delivery condition; suitable substitute for many applications. |
| USA | ASTM A1011/A1011M | HSLAS Grade 60 Class 1 | Minimum yield 410 MPa; slightly lower strength, but comparable formability; verify thickness range. |
| Japan | JIS G 3113 | SAPH440 | Minimum tensile 440 MPa; automotive HSLA; strength lower than S420NC but good formability; may serve as substitute in less demanding parts. |
| China | GB/T 20887.1 | QStE420TM | Thermomechanical HSLA; very similar chemistry and mechanical concept; close substitute under Chinese automotive standard. |
Notes:
- The specified mechanical properties are valid for transverse test pieces only when agreed at the time of order; standard testing is longitudinal.
- Normalized or normalized rolled delivery condition provides more uniform properties and improved toughness compared to as-rolled condition.
- Surface condition options include 'descaling by pickling' and 'oiling' for enhanced corrosion protection during storage.
- For detailed welding recommendations, refer to EN 1011-2 and the steel manufacturer's guidelines.
- Always verify the latest version of BS EN 10149-3 to ensure compliance with current requirements.
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