Q235B is the most widely used carbon structural steel grade in China (GB/T 700), directly equivalent to ASTM A36 (USA), JIS SS400 (Japan), and EN S235JR (1.0038, Europe). Minimum yield strength 235 MPa. Suitable for general structural purposes, shipbuilding, bridge construction, machinery parts, and building fabrication.
Chemical Composition
Per GB/T 700 — maximum allowable content (% by mass).
| Grade | C (%) | Si (%) | Mn (%) | P (%) | S (%) |
|---|---|---|---|---|---|
| Q235B | ≤0.22 | ≤0.35 | ≤1.40 | ≤0.045 | ≤0.045 |
Mechanical Properties
| Grade | Yield (MPa) | Tensile (MPa) | Elongation (%) | Impact (J) |
|---|---|---|---|---|
| Q235B | ≥235 | 370–500 | ≥26 | 27 @ 20°C |
Available Sizes & Delivery
| Thickness | 0.3–200 mm |
| Width | 1000–3000 mm |
| Length | 2500–12000 mm or as required |
| Delivery Condition | Hot rolled as-rolled / Normalized |
| Standard | GB/T 700 |
| Mill Test Certificate | EN 10204 3.1 with every shipment |
| Surface | Mill finish, pickled, or shot-blasted primed |
| MOQ | 3 Tons |
| Delivery Time | Within 7 days (≤500 tons) |
Equivalent Grades
| Standard | Grade | Country |
|---|---|---|
| GB/T 700 | Q235B | China |
| ASTM | A36 | USA |
| JIS G3101 | SS400 | Japan |
| EN 10025-2 | S235JR (1.0038) | Europe |
| DIN | St 37-2 | Germany |
Applications
General structural fabrication — beams, columns, angles; shipbuilding plates; bridge components and highway guardrails; machinery bases and equipment frames; construction scaffolding; welded steel pipes and hollow sections.
Values are typical reference ranges per GB/T 700. Actual properties may vary by mill and production route. Mill test certificates (EN 10204 3.1) are supplied with every shipment — contact us for exact data sheets.
