Q-BQB 310-2009 B480QZR Automobile Structure Steel Plate
Q-BQB 310-2009 B480QZR Automobile Structure Steel Plate | Chemical Composition & Properties
Explore the properties, chemical composition, mechanical performance, and thermal properties of Q-BQB 310-2009 B480QZR automobile structure steel plate. Find equivalent grades, similar materials, and application guide.
Cold forming, bending, stamping, welding
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Q-BQB 310-2009 B480QZR Automobile Structure Steel Plate Introduction
B480QZR is a hot-rolled high-strength low-alloy (HSLA) steel grade specified in Baosteel's enterprise standard Q/BQB 310-2009 for automobile structural parts. It is a ferritic-bainitic dual-phase steel with a minimum yield strength of 480 MPa, offering a good balance of strength, formability, and weldability. This grade is designed for structural and reinforcement components in vehicles, such as chassis parts, beams, and brackets.
Q-BQB 310-2009 B480QZR Automobile Structure Steel Plate Chemical Composition
The chemical composition limits for B480QZR as per Q/BQB 310-2009 (ladle analysis). The steel is microalloyed with niobium and/or titanium to achieve fine grain size and precipitation strengthening.
| Element | Value (max %) | Remarks |
|---|---|---|
| Carbon (C) | 0.10 | |
| Silicon (Si) | 0.50 | |
| Manganese (Mn) | 1.60 | |
| Phosphorus (P) | 0.035 | |
| Sulfur (S) | 0.030 | |
| Aluminium (Altotal) | ≥ 0.015 | minimum requirement |
| Niobium (Nb) | 0.09 | |
| Titanium (Ti) | 0.22 | |
| Others (V+Nb+Ti) | ≤ 0.22 | if not individually specified |
Q-BQB 310-2009 B480QZR Automobile Structure Steel Plate Thermal and Electrical Physical Properties
Typical physical properties for B480QZR steel at ambient temperature. These values are for reference only and not specified by Q/BQB 310-2009.
| Property | Typical Value | Unit | Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20°C |
| Elastic modulus (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 × 10⁻⁶ | /K | 20–100°C |
| Thermal conductivity (λ) | 42 | W/(m·K) | 20°C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | 20°C |
| Electrical resistivity (ρe) | 0.22 × 10⁻⁶ | Ω·m | 20°C |
Q-BQB 310-2009 B480QZR Automobile Structure Steel Plate Mechanical Properties
Mechanical properties according to Q/BQB 310-2009 for transverse test pieces at room temperature. The values represent minimum requirements for the as-delivered condition.
| Property | Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReL) | ≥ 480 | MPa | Transverse, thickness ≤ 12 mm |
| Tensile Strength (Rm) | ≥ 620 | MPa | Transverse, thickness ≤ 12 mm |
| Elongation after fracture (A) | ≥ 18 | % | Gauge length 80 mm (A80), thickness ≤ 3 mm |
| Elongation after fracture (A) | ≥ 22 | % | Gauge length 5.65√So (A5), thickness > 3 mm |
| Bend test (180°, mandrel diameter) | 1.5 × t | – | No cracks, t = sheet thickness |
Q-BQB 310-2009 B480QZR Automobile Structure Steel Plate Equivalent Material Grades and Standards
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2:2013 | S500MC | Similar HSLA grade, YS ≥ 500 MPa |
| International | ISO 6930-1:2008 | FeE500 | Yield strength class 500 MPa |
| USA | SAE J1392 (2008) | 050XLK | Approximate HSLA 480 grade |
| China (GB) | GB/T 20887.1-2007 | HR600/480DP | Cold-rolled dual-phase; comparable strength |
Q-BQB 310-2009 B480QZR Automobile Structure Steel Plate Application Introduction
B480QZR steel is primarily used in automotive structural components where high strength and good formability are required. It can be formed by cold bending, drawing, and stamping. The steel offers good weldability with conventional methods (spot, arc welding), allowing the fabrication of complex assemblies.
Product Applications: Automotive chassis frames and subframes, Suspension arms and control links, Bumpers and reinforcement beams, Longitudinal and cross members, Seat structures and brackets, Wheel discs and rims (heavy gauge)
Processed into products: Stamped brackets and reinforcements, Bent or roll-formed profiles, Welded assemblies (spot, MIG/MAG), Hydroformed tubes, Laser-welded blanks
Application industries: Automotive manufacturing, Commercial vehicle (truck/bus) chassis, Agricultural machinery, Construction machinery (light-duty)
Q-BQB 310-2009 B480QZR Automobile Structure Steel Plate Similar / Alternative Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S460MC | Lower yield strength, but similar formability |
| Europe | EN 10346 | HX500LAD | Hot-dip galvanized HSLA, yield ~500 MPa |
| Japan | JIS G 3134 | SPFH 590 | Hot-rolled high-strength steel for automotive |
| Germany | DIN EN 10149-2 | S500MC | Identical to EN |
| China | GB/T 20887.1 | HR500/600DP | Hot-rolled dual-phase steel, similar application |
Notes:
Processing: B480QZR is delivered in the hot-rolled condition without heat treatment. For optimal formability, the material may be used as-received, but severe cold forming may require intermediate stress relieving.
Weldability: The low carbon equivalent (CEV typically ≤ 0.35) ensures good arc and resistance welding properties. Preheating is not required for thicknesses up to 20 mm.
Corrosion protection: The steel is not inherently corrosion resistant; surface coatings (painting, e-coating, galvanizing) are recommended for outdoor exposure.
Ordering: Specify thickness, width, flatness, surface quality (pickled, oiled), and whether special inspection or testing is required according to Q/BQB 310-2009.
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