Q235B Carbon Steel Coil is a commonly used carbon structural steel with excellent strength, plasticity and welding properties. It is widely used in various engineering fields such as building structures, bridges, and machinery manufacturing. Its comprehensive mechanical properties are stable and easy to process and form. It is one of the ideal choices for structural steel.
Chemical Composition
| Element | Maximum content (%) |
| C | ≤ 0.22 |
| Si | ≤ 0.35 |
| Mn | ≤ 1.40 |
| P | ≤ 0.045 |
| S | ≤ 0.045 |
| N | ≤ 0.012 |
| Cu | ≤ 0.30 |
Key Parameters
| Property | Value/Description |
|---|---|
| Yield Strength (σs) | ≥235 MPa |
| Tensile Strength (σb) | 375–500 MPa |
| Elongation (δ5) | ≥26% |
| Carbon Content (C) | 0.12–0.20% |
| Impact Toughness | ≥27 J (at 20°C, Charpy V-notch test) |
| Recommended Standards | GB/T 700, ASTM A36 (similar properties, not identical) |
Q235B Carbon Steel Coil: Properties & Applications
| Category | Details |
|---|---|
| Material Standard | Chinese National Standard GB/T 700 (Carbon Structural Steel), Yield Strength ≥235 MPa, Low-Moderate Carbon (C: 0.12–0.20%) |
| Form & Advantages | Supplied in coil form for efficient transportation and processing; good surface quality for coatings. |
| Key Properties | |
| - Strength | Higher strength than Q195 (Yield ≥235 MPa, Tensile: 375–500 MPa). |
| - Weldability | Good weldability (pre-heat required for thick sections to prevent cracks). |
| - Ductility | Elongation ≥26%, suitable for bending, stamping, and moderate forming. |
| - Cost Efficiency | Widely available, economical for medium-strength structural applications. |
| Primary Uses | |
| - Construction | Structural frameworks, beams, columns, roofing, and reinforcement components. |
| - Machinery | Machine frames, agricultural equipment, truck chassis, and load-bearing parts. |
| - Infrastructure | Bridges, transmission towers, railway components, and storage tanks. |
| - General Engineering | Bolts, nuts, gears, and forged parts requiring moderate strength. |
| Processing Methods | |
| - Cold/Hot Working | Shearing, rolling, bending, punching; hot forming improves ductility. |
| - Welding | Arc welding, gas welding, or resistance welding (with proper pre-/post-treatment). |
| - Surface Treatment | Galvanizing, painting, or powder coating for corrosion resistance. |
| Limitations | |
| - Corrosion Resistance | Prone to rust; requires protective coatings in humid or corrosive environments. |
| - Temperature Limits | Avoid prolonged use above 350°C (reduces strength). |
| - Not for High-Stress | Unsuitable for critical high-stress applications (e.g., pressure vessels); use Q345 or higher grades. |
What are your advantages?
1) Fast delivery time
2) High quality, quantity is with preferential treatment
3) We can process to different finish you request
4) Good quality with reasonable price
5) Buyer's Specification Accepted
6) Experienced R & D Department
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