Q235B
Data verifiedQ235B is China’s everyday carbon structural steel — the volume grade for domestic construction, plate, sections and welded tube. Grade B adds a room-temperature impact test over the basic A quality, making it the default export offer in this strength class.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.12–0.20 |
| Si | ≤0.30 |
| Mn | 0.30–0.70 |
| P | ≤0.045 |
| S | ≤0.045 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Yield strength | ≥235 MPa (≤16 mm) |
| Tensile strength | 370–500 MPa |
| Impact | B grade: 27 J at 20 °C |
| Density | 7.85 g/cm³ |
Heat treatment
Supplied hot rolled; no hardening treatment.
Equivalent grades
| Standard | Designation |
|---|---|
| din | S235JR (near) |
| aisi | A36 (near) |
| jis | SS400 (near) |
| gb | Q235B (GB/T 700) |
Compare side by side: Q235B vs S235JR · Q235B vs ASTM A36
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Building steel, plate and sections, welded structures, general fabrication.
Processing: Excellent weldability and formability; the Chinese counterpart most often quoted against S235JR and A36.
FAQ
- Q235B vs S235JR — can I substitute?
- Yes for most general work: same 235 MPa class, overlapping chemistry. Keep the impact grade letters aligned (B ≈ JR at 20 °C) and check project specs for CE/EN 1090 needs.
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Ask for a quotationVisit NasteelSource: GB/T 700 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.