JIS G3113 SAPH310 Automotive Structural Steel Plate
JIS G3113 SAPH310 Automotive Structural Steel Plate: Properties, Equivalents & Applications
Complete material data for JIS G3113 SAPH310 hot-rolled automotive structural steel plate, including chemical composition, mechanical and physical properties, international equivalents, and applications.
Hot rolling, Cold forming, Stamping, Bending, Welding
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JIS G3113 SAPH310 Automotive Structural Steel Plate Introduction
JIS G3113 SAPH310 is a hot-rolled steel plate for automotive structural use, defined under the Japanese Industrial Standard G3113. It features a balanced combination of moderate strength, excellent formability, and good weldability. The steel is characterized by a minimum tensile strength of 310 MPa and a minimum yield strength of 185 MPa, with elongation properties that vary with thickness. Its low carbon content (max 0.12%) and controlled manganese and silicon levels ensure ease of cold forming and welding, making it ideal for mass-produced automotive components such as frames, chassis parts, wheels, and brackets. Supplied in the as-rolled condition, SAPH310 provides a cost-effective solution for structural applications requiring reliable performance without the need for additional heat treatment.
JIS G3113 SAPH310 Automotive Structural Steel Plate Chemical Composition
The chemical composition of SAPH310 is controlled to ensure weldability and formability. Values are maximum unless otherwise noted. The steel contains low carbon, with manganese and silicon added for strength. Phosphorus and sulfur are limited to maintain ductility and toughness.
| Element | Standard Value (max %) | Remarks |
|---|---|---|
| C | 0.12 | Ladle analysis |
| Si | 0.40 | Often not specified but typically controlled |
| Mn | 0.60 | |
| P | 0.040 | |
| S | 0.040 |
JIS G3113 SAPH310 Automotive Structural Steel Plate Thermal and Electrical Physical Properties
The following physical properties are typical for low-carbon steel grades like SAPH310. They are not mandatory in the standard but are commonly used for engineering calculations.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At room temperature |
| Modulus of Elasticity (E) | 210 | GPa | At room temperature |
| Shear Modulus (G) | 80 | GPa | At room temperature |
| Poisson's Ratio (ν) | 0.3 | — | At room temperature |
| Thermal Expansion Coefficient (α) | 12.0 × 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 (ρ_e) | 0.15 | µΩ·m | At 20 °C |
JIS G3113 SAPH310 Automotive Structural Steel Plate Mechanical Properties
Mechanical properties are determined on test pieces taken in the transverse direction according to JIS G3113. Yield strength, tensile strength, elongation, and bendability are the key parameters. The values depend on the product thickness.
| Property | Required Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 185 | MPa | All thicknesses |
| Tensile Strength (Rm) | ≥ 310 | MPa | All thicknesses |
| Elongation (A) | ≥ 30 | % | Thickness < 3.2 mm, JIS No.5 specimen (gauge length 50mm) |
| Elongation (A) | ≥ 33 | % | Thickness ≥ 3.2 mm and ≤ 6.0 mm, JIS No.1A (gauge length 200mm) |
| Elongation (A) | ≥ 35 | % | Thickness > 6.0 mm and ≤ 8.0 mm, JIS No.1A |
| Elongation (A) | ≥ 38 | % | Thickness > 8.0 mm and ≤ 12.0 mm, JIS No.1A |
| Bending Test (180°) | d = 0.5 t | — | Thickness ≤ 3.2 mm, no cracks on outside of bend |
| Bending Test (180°) | d = 1.0 t | — | Thickness > 3.2 mm, no cracks on outside of bend |
JIS G3113 SAPH310 Automotive Structural Steel Plate Full Equivalent Material Standards and Recommended Substitution Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Japan | JFS A1001 | SAPH310 | Identical to JIS G3113 SAPH310 |
| International | ISO 3573 | HR2 | Equivalent requirements for hot-rolled carbon steel sheet |
JIS G3113 SAPH310 Automotive Structural Steel Plate Application Introduction
SAPH310 is primarily utilized in the automotive industry for structural components that require good formability and moderate strength. Its excellent weldability allows integration into complex assemblies. The steel is also suitable for general engineering applications where similar performance is needed. It is often chosen for cost-sensitive, high-volume production due to its balanced properties and availability in various thicknesses.
Product Applications: Automotive body-in-white structural parts (e.g., floor panels, reinforcements), Chassis frames and sub-frames, Suspension components and control arms, Wheel rims and discs, Cross members, longitudinal beams, and brackets, Seat structures and safety belt components
Processed into products: Engine mount brackets, Brake pedal levers, Fuel tank straps, Hinge reinforcements for doors and hoods, Spring seats and shackle plates, Tow hitch components, Exhaust system hangers
Application industries: Automotive manufacturing, Commercial vehicle and trailer production, Agricultural and construction machinery, General sheet metal fabrication
JIS G3113 SAPH310 Automotive Structural Steel Plate Similar/Comparable Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10111 | DD12 | Similar formability and weldability; tensile strength 270–410 MPa, yield 170–340 MPa. Suitable for deep drawing but may need strength verification. |
| USA | ASTM A1011 | CS Type B | Commercial quality hot-rolled sheet with min. tensile strength 310 MPa, no guaranteed yield strength. Acceptable for general structural use. |
| China | GB/T 3273 | 08Al (or similar) | Chinese standard for automobile frame steel, but exact grade correspondence requires careful selection; 08AL offers similar drawability. |
Notes:
Unless otherwise agreed, SAPH310 is supplied with a mill scale surface finish without additional descaling or coating. For higher strength requirements within the same family, SAPH370 or SAPH440 may be considered under JIS G3113. When enhanced corrosion resistance is needed, consider galvanized products per JIS G3302, applied after forming. The mechanical property test pieces are taken in the transverse direction per standard practice. Data are based on JIS G3113:2006 and typical physical properties; confirm with actual mill certificates for critical applications.
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