S510L Hot Rolled Steel Coil for Automobile Frame
S510L Hot Rolled Steel Coil for Automobile Frame - GB/T 3273-2005
Comprehensive material data for S510L hot-rolled steel coil according to Chinese standard GB/T 3273-2005, covering chemistry, mechanical properties, and international equivalents.
Hot rolling, cutting, stamping, forming, welding
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S510L Hot Rolled Steel Coil for Automobile Frame Introduction
S510L is a hot-rolled steel coil specifically designed for automobile frame applications, standardized under GB/T 3273-2005. It belongs to the high-strength low-alloy (HSLA) steel category with excellent formability and weldability. The steel offers a minimum tensile strength of 510 MPa and specified minimum yield strength of 355 MPa (for thickness ≤8 mm), ensuring structural integrity in load-bearing components. Its chemical composition includes controlled levels of carbon, manganese, and micro-alloying elements such as niobium and titanium to achieve grain refinement and precipitation strengthening.
- High strength and good toughness for dynamic loads.
- Superior bending performance.
- Supplied in hot-rolled condition, typically as pickled and oiled or black coil.
This steel is widely used in chassis and frame parts of trucks, trailers, and buses.
S510L Hot Rolled Steel Coil for Automobile Frame Chemical Composition
Chemical composition limits according to GB/T 3273-2005 for grade S510L. The values are maximum unless indicated as minimum (e.g., Al). The micro-alloying elements Nb, V, Ti are used for grain refinement and precipitation strengthening.
| Element | Content (%) | Remarks |
|---|---|---|
| C | ≤ 0.20 | Maximum |
| Si | ≤ 0.50 | Maximum |
| Mn | ≤ 1.60 | Maximum |
| P | ≤ 0.030 | Maximum |
| S | ≤ 0.030 | Maximum |
| Alt | ≥ 0.015 | Minimum (total aluminum) |
| Nb | ≤ 0.09 | Maximum |
| V | ≤ 0.20 | Maximum |
| Ti | ≤ 0.15 | Maximum |
S510L Hot Rolled Steel Coil for Automobile Frame Physical Properties
Physical characteristics typical for a low-carbon micro-alloyed steel like S510L. These values are not part of GB/T 3273-2005 but represent commonly accepted data for similar HSLA steels and can be used for engineering calculations.
| Property | 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) | 12.0 | 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 | 10⁻⁶ Ω·m | At 20 °C |
S510L Hot Rolled Steel Coil for Automobile Frame Mechanical Properties
Mechanical properties as specified in GB/T 3273-2005 for S510L hot-rolled steel. The requirements depend on the nominal thickness (t). Tensile tests use transverse specimens with gauge length L0=80 mm and width b=20 mm (A80).
| Property | Value | Unit | Test Condition |
|---|---|---|---|
| Lower yield strength (ReL) | ≥ 355 | MPa | Thickness ≤ 8.0 mm |
| Lower yield strength (ReL) | ≥ 345 | MPa | Thickness > 8.0 mm |
| Tensile strength (Rm) | 510 – 630 | MPa | All thicknesses |
| Elongation after fracture (A) | ≥ 24 | % | L0=80 mm, b=20 mm, thickness ≤ 8.0 mm |
| Elongation after fracture (A) | ≥ 24 | % | L0=80 mm, b=20 mm, thickness > 8.0 mm |
| Bend test (180°) | d = 2a | – | Bend diameter; thickness ≤ 8.0 mm (a = thickness) |
| Bend test (180°) | d = 3a | – | Bend diameter; thickness > 8.0 mm (a = thickness) |
S510L Hot Rolled Steel Coil for Automobile Frame Directly Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| – | – | – | No exact international equivalent exists. Similar grades are provided below. |
S510L Hot Rolled Steel Coil for Automobile Frame Application Introduction
S510L steel is optimized for structural components in the automotive and transportation industries that require high strength, good cold formability, and reliable weldability.
- Excellent fatigue resistance under dynamic loads
- Good dimensional accuracy and surface quality for subsequent processing
- Suitable for both light and heavy commercial vehicles
Product Applications: Truck chassis frames, Trailer main beams and cross members, Bus underframe structures, Dump truck bodies, Agricultural vehicle frames
Processed into products: Longitudinal frame rails (chassis longerons), Cross members, Suspension mounting brackets, Reinforcement plates and gussets, Tow bar brackets, Spring pads
Application industries: Automotive manufacturing, Commercial vehicle production, Trailer and semi‑trailer engineering, Bus and coach building, Special purpose vehicle construction
S510L Hot Rolled Steel Coil for Automobile Frame Closely Related / Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S500MC | Higher yield strength (≥500 MPa) and tensile strength (550-700 MPa). Better formability for more demanding parts. |
| Europe | EN 10149-2 | S460MC | Yield ≥460 MPa, tensile 520-670 MPa. Closer in tensile range, but yield significantly higher. |
| Japan | JIS G3113 | SAPH440 | Lower strength: yield ≥305 MPa, tensile ≥440 MPa. Suitable for less demanding structural parts. |
| USA | ASTM A1011/A1011M | HSLAS Grade 70 [480] | Yield 480 MPa, tensile 550 MPa (higher yield, similar tensile). Chemical composition may differ. |
| USA | ASTM A1011/A1011M | SS Grade 55 [380] | Yield 380 MPa, tensile 515 MPa – closest tensile match but lower yield. |
Notes:
Additional remarks: For specific thicknesses outside 1.6–12.5 mm, consult the manufacturer. Surface quality and flatness tolerances conform to GB/T 709. When ordering, specify whether pickled and oiled or as-rolled finish is required. The steel can be hot-dip galvanized for corrosion protection; however, the coating process must be compatible with the high-strength properties.
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