Description (English)
Shanghai Vertex Alloy Co., Ltd (Vertex Alloy) supplies Q235B carbon structural steel sheet and plate to GB/T 700-2006 / GB/T 3274. Q235B is China's most widely used general-purpose structural steel: minimum yield strength 235 MPa (≤ 16 mm thick), tensile strength 370–500 MPa and elongation ≥ 26%, with the B quality level guaranteeing 27 J longitudinal Charpy V-notch impact energy at +20°C. Low carbon (≤ 0.20%) and carbon equivalent give outstanding weldability — SMAW, GMAW, FCAW and SAW all work with standard consumables and no preheat for normal thicknesses; the 180° cold-bend test (d = 1.5a) confirms good formability. Broadly equivalent to ASTM A36, EN S235JR (1.0038), JIS SS400 and DIN St37-2. Hot-rolled plate 2–200 mm thick, 1000–2500 mm wide, up to 12000 mm long; cold-rolled sheet 0.5–6 mm; delivery as-rolled, controlled-rolled or normalized. Cutting, bending, drilling and shot-blast + primer processing available; EN 10204 3.1 certificates with full heat traceability. Typical applications: building steel frames and base plates, bridges, machinery frames, ship superstructures, transmission towers and general fabrication. Contact us for the latest stock and pricing.
Size Range
- 2–200 mm (hot-rolled); 0.5–6 mm (cold-rolled)
Grade Specification
| System | Value |
|---|---|
| 🇨🇳 GB | Q235B |
| 🇺🇸 ASTM | A36 |
| 🇪🇺 EN | S235JR (1.0038) |
| 🇩🇪 DIN | St37-2 |
| 🇯🇵 JIS | SS400; SM400A (JIS G3106) |
| AFNOR | E24-2 |
Chemical Composition
| Element | Value |
|---|---|
| C | ≤ 0.20 |
| Si | ≤ 0.35 |
| Mn | ≤ 1.40 |
| P | ≤ 0.045 |
| S | ≤ 0.045 |
| Fe | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Yield Strength ReL (≤ 16 mm) | ≥ 235 MPa |
| Tensile Strength Rm | 370 – 500 MPa |
| Elongation A (longitudinal, ≤ 16 mm) | ≥ 26% |
| Charpy V-Notch KV2 (B level) | ≥ 27 J at +20°C, longitudinal |
| Cold Bend (180°, d = 1.5a) | No cracking |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | - | 7.85 g/cm³ |
| Elastic Modulus (20°C) | - | ~ 206 GPa |
| Mean CTE (20–100°C) | - | ~ 11.7 × 10⁻⁶ /K |
| Thermal Conductivity | - | ~ 50 W/m·K |
| Specific Heat | - | ~ 470 J/kg·K |
| Melting Range | - | ~ 1425 – 1540°C |
| Heat Treatment (if required) | - | Normalizing 880–920°C, air cool |
Applications
- Building & Construction
- Bridges & Roads
- Machinery & Heavy Equipment
- Shipbuilding
- Transport
- Power & Utility
- General Fabrication
- Cold-Rolled Sheet Products