AG490CL Hot Rolled Steel Coil for Automotive Structural Applications per Q/BQB 310
AG490CL Hot Rolled Steel Coil for Automotive Structural Applications per Q/BQB 310-2009
Detailed material data for AG490CL hot rolled steel coil according to Baosteel enterprise standard Q/BQB 310-2009. Includes chemical composition, mechanical properties, physical properties, and application guidance.
Cold forming, bending, stamping, welding
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AG490CL Hot Rolled Steel Coil for Automotive Structural Applications per Q/BQB 310 Introduction
AG490CL is a hot-rolled high-strength low-alloy (HSLA) steel grade specified in Q/BQB 310-2009 by Baosteel. It is primarily designed for cold forming of automotive structural components. The grade offers a minimum tensile strength of 490 MPa, combining good formability with high strength to enable weight reduction in vehicle design. Typical applications include chassis parts, longitudinal beams, and reinforcements. The steel is supplied in coil or cut-to-length sheet form, with excellent weldability and consistent mechanical properties achieved through controlled rolling and microalloying.
AG490CL Hot Rolled Steel Coil for Automotive Structural Applications per Q/BQB 310 Chemical Composition
The chemical composition of AG490CL is designed to achieve the required strength and formability through microalloying with niobium, titanium, and vanadium. Low carbon content ensures good weldability and toughness. The values below represent the standard requirements per Q/BQB 310-2009.
| Element | Standard Value (max unless range) | Remarks |
|---|---|---|
| Carbon (C) | ≤0.12 | |
| Silicon (Si) | ≤0.50 | |
| Manganese (Mn) | ≤1.60 | |
| Phosphorus (P) | ≤0.030 | |
| Sulfur (S) | ≤0.025 | |
| Aluminum (Alt) | ≥0.015 | total aluminum |
| Niobium (Nb) | ≤0.09 | or V, Ti combined |
| Titanium (Ti) | ≤0.15 | |
| Vanadium (V) | ≤0.10 | Depending on microalloying configuration |
AG490CL Hot Rolled Steel Coil for Automotive Structural Applications per Q/BQB 310 Thermal and Electrical Physical Properties
The following physical properties are typical for high-strength low-alloy steels and apply to AG490CL at room temperature unless otherwise noted. These values are useful for design calculations, heat transfer analysis, and forming simulations. Variations may occur due to exact composition and processing.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Modulus of Elasticity (E) | 210 | GPa | 20°C |
| Shear Modulus (G) | 80 | GPa | 20°C |
| Poisson's Ratio (ν) | 0.3 | 20°C | |
| Thermal Expansion Coefficient (α) | 12.0 | 10⁻⁶/K | 20 - 100°C |
| Thermal Conductivity (λ) | 50 | W/(m·K) | 20°C |
| Specific Heat Capacity (cp) | 460 | J/(kg·K) | 20°C |
| Electrical Resistivity (ρ_e) | 0.15 | μΩ·m | 20°C |
AG490CL Hot Rolled Steel Coil for Automotive Structural Applications per Q/BQB 310 Mechanical Properties
Mechanical properties are guaranteed for transverse test specimens according to Q/BQB 310-2009. Values depend on thickness. The steel exhibits a good balance between yield strength and elongation, suitable for cold forming operations. Bend test requirement is also provided. Impact toughness is not specified for this grade (cold forming class).
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥355 | MPa | Thickness ≤6.0 mm |
| Yield Strength (ReH) | ≥345 | MPa | Thickness >6.0 - 12.0 mm |
| Tensile Strength (Rm) | 490 - 630 | MPa | All thickness |
| Elongation after fracture (A) | ≥22 | % | Thickness ≤6.0 mm, Lo=50mm |
| Elongation after fracture (A) | ≥21 | % | Thickness >6.0 - 12.0 mm, Lo=50mm |
| Bend Test (180°) | d=0.5a | Bend diameter d, specimen thickness a, no cracks |
AG490CL Hot Rolled Steel Coil for Automotive Structural Applications per Q/BQB 310 Fully Equivalent Material Standards and Substitute Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China (Baosteel) | Q/BQB 310-2009 | AG490CL | Original specification |
AG490CL Hot Rolled Steel Coil for Automotive Structural Applications per Q/BQB 310 Application Introduction
AG490CL is engineered for demanding automotive structural applications where high strength, good fatigue resistance, and formability are essential. Its consistent mechanical properties and excellent weldability enable efficient manufacturing processes.
Product Applications: Truck chassis frames, Longitudinal and cross beams, Reinforcement plates and brackets, Wheel rims and spokes (heavy duty), Dump truck bodies
Processed into products: Chassis side rails, Cross members, Spring brackets, Mounting plates, Frame extensions, Reinforcement gussets
Application industries: Automotive manufacturing, Commercial vehicle production, Trailer and semi-trailer fabrication, Agricultural machinery
AG490CL Hot Rolled Steel Coil for Automotive Structural Applications per Q/BQB 310 Similar/Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S500MC | Close match in strength and formability, thermomechanically rolled |
| Europe | EN 10051 | QStE500TM | High-strength cold-forming steel, similar yield and tensile ranges |
| Japan | JIS G 3113 | SAPH440 | Lower tensile strength (min 440 MPa); requires thickness consideration |
| China | GB/T 3273 | 510L | Chinese automotive beam steel, min tensile 510 MPa, slightly higher strength |
Notes:
AG490CL is typically supplied in the as-rolled or controlled-rolled condition. The steel may be ordered with pickled surface for improved appearance and paint adhesion. For welding, low-hydrogen practices are recommended. While not specified, the grade generally exhibits good impact toughness at ambient temperatures. Consult the mill test certificate for actual properties. Dimensional tolerances and flatness are per Q/BQB 301-2009.
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