AG420CL Hot Rolled Steel Coil for Automotive Wheels
AG420CL Hot Rolled Steel Coil for Automotive Wheels - Q/BQB 310-2009
Comprehensive material data for AG420CL hot rolled steel coil, defined in Baosteel standard Q/BQB 310-2009, covering chemical composition, mechanical and thermal properties, equivalent grades, and application guidelines.
Hot rolling, pickling, oiling, slitting, cut-to-length, stamping, roll forming, welding
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AG420CL Hot Rolled Steel Coil for Automotive Wheels Introduction
AG420CL is a hot-rolled microalloyed steel grade from Baosteel's corporate standard Q/BQB 310-2009, specifically designed for automotive wheel applications. The 'A' denotes automotive structural use, 'G' indicates wheel-specific grade, '420' specifies a minimum yield strength of 420 MPa, and 'CL' stands for cold forming capability. It combines high strength, good formability, and excellent weldability, making it ideal for wheel rims, discs, and spokes. The steel is supplied as hot-rolled coil, typically in the as-rolled or pickled and oiled condition. It offers a balanced combination of strength and ductility, ensuring safe and durable wheel components while enabling efficient manufacturing processes like stamping, roll forming, and flash butt welding.
AG420CL Hot Rolled Steel Coil for Automotive Wheels Chemical Composition
The chemical composition of AG420CL is controlled to meet the strength and formability requirements of automotive wheel applications. Microalloying elements Nb, V, and Ti provide grain refinement and precipitation strengthening. Maximum limits ensure weldability and ductility.
| Element | Content (wt.%) | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.12 | Ladle analysis |
| Silicon (Si) | ≤ 0.50 | Ladle analysis |
| Manganese (Mn) | ≤ 1.50 | Ladle analysis |
| Phosphorus (P) | ≤ 0.025 | Ladle analysis |
| Sulfur (S) | ≤ 0.015 | Ladle analysis |
| Aluminium (Alt) | ≥ 0.015 | Total aluminium, ladle analysis |
| Niobium (Nb) | ≤ 0.09 | Ladle analysis |
| Vanadium (V) | ≤ 0.10 | Ladle analysis |
| Titanium (Ti) | ≤ 0.15 | Ladle analysis |
| Nb+V+Ti | ≤ 0.22 | Combined microalloy addition |
AG420CL Hot Rolled Steel Coil for Automotive Wheels Thermal and Electrical Physical Properties
Physical properties of AG420CL are typical for low‑carbon microalloyed steels. These values are representative for design and simulation purposes at room temperature unless noted otherwise. They can be used for heat transfer, structural, and electrical calculations.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | Room temperature |
| Young's Modulus (E) | 210 | GPa | Room temperature, tensile |
| Shear Modulus (G) | 80.8 | GPa | Calculated from E and ν = 0.3 |
| Poisson's Ratio (ν) | 0.30 | – | Elastic range, room temperature |
| Thermal expansion coefficient (α) | 12.1 × 10-6 | K-1 | 20 – 200 °C |
| Thermal conductivity (λ) | 49.8 | W/(m·K) | At 20 °C |
| Specific heat capacity (cp) | 461 | J/(kg·K) | Room temperature |
| Electrical resistivity (ρe) | 0.20 | μΩ·m | At 20 °C |
AG420CL Hot Rolled Steel Coil for Automotive Wheels Mechanical Properties
The mechanical properties of AG420CL are determined on transverse test pieces. The steel exhibits a minimum yield strength of 420 MPa for thicknesses up to 6 mm, with a specified tensile strength range to ensure consistent forming behaviour. Elongation values depend on thickness. Bending test verifies formability.
| Property | Value | Unit | Test Condition / Remarks |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 420 | MPa | Thickness ≤ 6.0 mm, transverse |
| Tensile Strength (Rm) | 480 – 620 | MPa | Thickness ≤ 6.0 mm, transverse |
| Elongation after fracture (A50mm) | ≥ 22 | % | Thickness ≤ 3.0 mm, transverse |
| Elongation after fracture (A50mm) | ≥ 20 | % | Thickness 3.0 < t ≤ 6.0 mm, transverse |
| Bending test (bend angle 180°) | d = 1a | – | Thickness ≤ 6.0 mm; d = bend diameter, a = specimen thickness |
| Impact test (KV2) | Not specified | J | – |
AG420CL Hot Rolled Steel Coil for Automotive Wheels Full Equivalent Standards and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| – | – | – | There is no internationally established direct full equivalent for AG420CL. The chemistry and property combination is tailored for Baosteel's automotive wheel specification. |
AG420CL Hot Rolled Steel Coil for Automotive Wheels Application Introduction
AG420CL is engineered for the demanding requirements of automotive wheel manufacturing. Its high yield strength enables weight reduction while maintaining fatigue life. The steel's good formability allows economical production of complex wheel geometries through stamping, roll forming, and welding. Typical products and applications are listed below.
Product Applications: Steel wheels for passenger cars and SUVs, Rim sections for two-piece wheels, Wheel discs (centers) welded to rims, Spokes for styled steel wheels
Processed into products: Automotive wheel rims (outer/bead seat and well), Wheel discs (centre flanges and vent holes), Wheel spoke patterns, Structural reinforcements welded into wheel assemblies, Industrial wheel components (e.g., for trailers and agricultural machinery)
Application industries: Automotive industry (passenger cars, light commercial vehicles)
AG420CL Hot Rolled Steel Coil for Automotive Wheels Similar / Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | Q/BQB 310-2009 | B420CL | Same standard, slightly different composition; used for general automotive structural parts, not specifically wheels. |
| China | Q/BQB 310-2009 | AG440QZ | Higher strength wheel steel (yield ≥440 MPa), alternative for lighter weight designs. |
| Japan | JIS G 3113:2018 | SAPH440 | Hot-rolled automotive structural steel; minimum tensile strength 440 MPa, but different chemistry and yield strength specification. |
| Germany / EU | EN 10025-2:2019 | S355MC | Thermomechanically rolled high-strength low-alloy steel; yield ≥355 MPa, lower strength but similar forming class. |
| USA | ASTM A1011/A1011M | HSLAS-F Grade 60 | HSLA steel with yield ≥415 MPa and tensile ≥520 MPa; close mechanical match, chemistry differs. |
Notes:
Additional remarks:
- The material is designed for flash butt welding of the rim and subsequent welding of the disc – excellent weldability is assured.
- Typical hot-rolled surface roughness (Ra) is 0.8–1.6 μm after pickling; suitable for subsequent e‑coating or painting.
- Microstructure consists of fine‑grained ferrite with dispersed carbides and carbonitrides from microalloying.
- Fatigue performance (e.g., rotary bending) is validated to meet SAE J328 requirements; typical endurance limit >200 MPa at 10⁷ cycles.
- Deep drawing and extreme stretching operations should be avoided; the steel is optimized for bending and flange forming.
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