ASTM A36
Data verifiedASTM A36 is the most widely used structural carbon steel in North America, the default material for buildings, bridges and general fabrication. Its chemistry limits relax as thickness grows, which is why A36 is a specification of minimum properties rather than a tight analysis.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.25 (plate ≤20 mm) |
| Si | ≤0.40 |
| Mn | 0.80–1.20 (plate >20 mm) |
| P | ≤0.040 |
| S | ≤0.050 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Yield strength | ≥250 MPa |
| Tensile strength | 400–550 MPa |
| Elongation | ≥20% (200 mm) |
| Density | 7.85 g/cm³ |
Heat treatment
Supplied as-rolled; no hardening treatment.
Equivalent grades
| Standard | Designation |
|---|---|
| din | S235JR (near) |
| aisi | A36 |
| jis | SS400 (near) |
| gb | Q235B (near) |
Compare side by side: ASTM A36 vs S235JR · ASTM A36 vs Q235B
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Building frames, base plates, brackets, general fabrication, machinery.
Processing: Excellent weldability, forming and machinability; the benchmark mild steel of US fabrication shops.
FAQ
- Is A36 the same as S235JR?
- Functionally interchangeable in most fabrication: A36 yields ≥250 MPa vs S235JR ≥235 MPa, and A36 has no standard impact requirement while JR guarantees 27 J at 20 °C.
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Ask for a quotationVisit NasteelSource: ASTM A36 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.