ASTM A36 vs S235JR
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
ASTM A36
Structural & HSLA Steel
ASTM 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.
Standards: DIN S235JR (near) · AISI A36 · JIS SS400 (near) · GB Q235B (near)
S235JR
Structural & HSLA Steel
S235JR is the baseline non-alloy structural steel of EN 10025-2, the default grade for ordinary steel construction across Europe. Its 235 MPa yield class and room-temperature impact guarantee cover the great majority of building and general fabrication work.
Standards: DIN 1.0038 (S235JR) · AISI A36 (near) · JIS SS400 (near) · GB Q235B (near)
Chemical composition compared (%)
| Element | ASTM A36 | S235JR |
|---|---|---|
| C | ≤0.25 (plate ≤20 mm) | ≤0.17 |
| Si | ≤0.40 | — |
| Mn | 0.80–1.20 (plate >20 mm) | ≤1.40 |
| P | ≤0.040 | ≤0.035 |
| S | ≤0.050 | ≤0.035 |
| Cu | — | ≤0.55 |
Properties compared
| Property | ASTM A36 | S235JR |
|---|---|---|
| Yield strength | ≥250 MPa | ≥235 MPa (≤16 mm; falls with thickness) |
| Tensile strength | 400–550 MPa | 360–510 MPa |
| Elongation | ≥20% (200 mm) | — |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Impact | — | JR: 27 J at 20 °C |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: ASTM A36 · S235JR. Substitution decisions for certified parts stay with the design authority.