B330CL Hot Rolled Steel Coil
B330CL Hot Rolled Steel Coil: Advanced High-Strength Cold-Forming Grade from Baosteel
Comprehensive material profile for B330CL hot rolled steel coil under Baosteel enterprise standard Q/BQB 310-2009, covering chemical composition, mechanical and physical properties, international equivalents, and application guidance.
Cold forming, stamping, bending, roll forming, welding, cutting
- Phone : +8618037372205
- Email : [email protected]
- WhatsApp: Contact via Whtsapp
- WeChat: +8618037372205
B330CL Hot Rolled Steel Coil Introduction
B330CL is a hot rolled high-strength low-alloy (HSLA) steel grade developed by Baosteel under the Q/BQB 310-2009 standard. It is designed for cold forming applications requiring a combination of good formability and elevated strength. The microstructure is refined through controlled rolling and microalloying with elements like niobium and titanium, providing fine grain strengthening. The steel exhibits a minimum tensile strength of 330 MPa, with yield strength typically above 255 MPa for thin gauges. It offers excellent weldability, consistent mechanical properties across the coil, and is supplied in various surface conditions (as-rolled, pickled and oiled). B330CL is widely used in automotive structural parts, wheel rims, and general engineering components where weight reduction and durability are critical.
B330CL Hot Rolled Steel Coil Chemical Composition
The chemical composition of B330CL steel is carefully controlled to achieve the desired mechanical properties and cold formability. Limits are specified according to the Baosteel standard Q/BQB 310-2009. Microalloying elements such as Nb and Ti are optionally added to refine the grain structure and enhance strength without sacrificing ductility. The total aluminum content ensures adequate deoxidation.
| Chemical Element | Standard Value | Remarks |
|---|---|---|
| Carbon (C) | ≤ 0.12 | max |
| Silicon (Si) | ≤ 0.50 | max |
| Manganese (Mn) | ≤ 1.40 | max |
| Phosphorus (P) | ≤ 0.030 | max |
| Sulfur (S) | ≤ 0.025 | max |
| Aluminium (Altotal) | ≥ 0.015 | min |
| Niobium (Nb) | ≤ 0.09 | optional, max |
| Titanium (Ti) | ≤ 0.15 | optional, max |
| Vanadium (V) | ≤ 0.20 | optional, max (if added) |
| Nitrogen (N) | ≤ 0.012 | typical residual |
B330CL Hot Rolled Steel Coil Thermal and Electrical Physical Properties
These values represent typical room-temperature physical properties for B330CL steel. They are provided for design and modeling purposes and may exhibit slight variations due to processing history and exact chemical composition. The thermal expansion coefficient is measured between 20 °C and 100 °C.
| Property | Typical Value | Unit | Test Condition / Temperature |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | 20 °C |
| Modulus of Elasticity (E) | 210 | GPa | 20 °C |
| Shear Modulus (G) | 81 | 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 (c) | 460 | J/(kg·K) | 20 °C |
| Electrical Resistivity (ρe) | 0.20 | Ω·mm²/m | 20 °C |
B330CL Hot Rolled Steel Coil Mechanical Properties
Mechanical properties are determined on test pieces taken transverse to the rolling direction. The values comply with Q/BQB 310-2009 and are dependent on product thickness. The bend test is performed with the mandrel diameter specified as a multiple of the sheet thickness (t). Impact energy values are not mandatory but may be agreed upon for certain applications.
| Property | Standard Requirement Value | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH) | ≥ 255 | MPa | thickness ≤ 6.0 mm, transverse |
| Yield Strength (ReH) | ≥ 240 | MPa | thickness > 6.0 mm, transverse |
| Tensile Strength (Rm) | 330 – 430 | MPa | transverse |
| Elongation (A80mm) | ≥ 23 | % | thickness ≤ 3.0 mm, gauge length 80 mm |
| Elongation (A5) | ≥ 26 | % | thickness > 3.0 mm, gauge length 5.65√S₀ |
| Bend Test (Mandrel Diameter) | 0.5 t | – | 180° bending, t = sheet thickness |
B330CL Hot Rolled Steel Coil Complete Equivalent Material Standards and Substitutable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| Europe | EN 10149-2 | S315MC | Closest international equivalent, similar chemistry and mechanical profile. |
| Japan | JIS G 3134 | SPFH540 | Comparable HSLA grade for automotive structural use, strength band overlaps. |
| USA | SAE J1392 | 050XLK | Approximate match in strength and formability, though not identical. |
| International | ISO 6930-2 | F315MC | International equivalent to S315MC, closely matches B330CL. |
B330CL Hot Rolled Steel Coil Application Introduction
B330CL steel is optimized for cold-formed components that require a balance of high strength and good ductility. Its excellent weldability and consistent coil properties make it ideal for high-volume manufacturing processes. Typical uses include:
- Automotive chassis and suspension parts
- Wheel rims and supporting members
- Seat structures and reinforcement beams
- Construction machinery brackets
Product Applications: Automotive underbody components, longitudinal beams, cross members, wheel rims, Chassis brackets, suspension arms, engine cradles, Seat frames, door impact beams, bumper reinforcements, Welded mechanical tubing, scaffold planks, storage rack profiles
Processed into products: Stamped and bent brackets, roll-formed sections, welded assemblies, drawn cups (if thickness allows), laser-cut blanks, and hydroformed parts.
Application industries: Automotive manufacturing, Construction machinery, General engineering, Shipbuilding (non-class structural parts), Transportation and logistics (containers, trailers)
B330CL Hot Rolled Steel Coil Similar/Alternative Material Recommendations
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| China | Q/BQB 310-2009 | B380CL | Higher strength variant with 380 MPa min tensile; slightly reduced formability. |
| Europe | EN 10149-2 | S350MC | Higher yield strength (≥350 MPa) alternative; may require adjustment in forming. |
| USA | ASTM A1011 / A1011M | Grade 50 (Class 1) | Comparable strength level; check availability of microalloyed version. |
| Japan | JIS G 3113 | SAPH440 | Higher tensile grade, suitable for applications where extra strength is needed. |
Notes:
Additional information:
- For thicknesses below 1.5 mm, cold-reduced and annealed grades might be more suitable.
- B330CL can be galvanized or painted after forming for corrosion protection.
- When replacing S315MC or similar grades, a full qualification of the forming process is recommended due to subtle differences in flow behavior.
- The carbon equivalent (CEV) is typically ≤ 0.35% for good weldability.
- Please refer to the original Baosteel Q/BQB 310-2009 document for exact specification limits and supplementary requirements.
- Share
