SM570 vs Q460C
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.
SM570
Structural & HSLA Steel
SM570 is the highest-strength grade of JIS G3106 rolled steel for welded structures: tensile 570–720 MPa with yield from 460 MPa, from a lean C-Mn chemistry kept weldable by carbon-equivalent control. It is the JIS counterpart class to GB Q460 and EN S460 plate for weight-critical welded construction.
Standards: DIN S460ML (near) · AISI A572 Gr.65 (near) · JIS SM570 (JIS G3106) · GB Q460C (near)
Q460C
Structural & HSLA Steel
Q460C is the 460 MPa class of GB/T 1591, the standard high-strength grade for landmark Chinese steel structures — it was the principal grade of the Beijing National Stadium. Quality C guarantees impact toughness at 0 °C.
Standards: DIN S460ML (near) · AISI A572 Gr.65 (near) · GB Q460C (GB/T 1591)
Chemical composition compared (%)
| Element | SM570 | Q460C |
|---|---|---|
| C | ≤0.18 | ≤0.20 |
| Si | ≤0.55 | ≤0.50 |
| Mn | ≤1.70 | ≤1.70 |
| P | ≤0.035 | ≤0.030 |
| S | ≤0.035 | ≤0.030 |
| Nb | — | 0.015–0.06 |
| V | — | 0.02–0.20 |
Properties compared
| Property | SM570 | Q460C |
|---|---|---|
| Yield strength | ≥460 MPa (≤16 mm) | ≥460 MPa (≤16 mm) |
| Tensile strength | 570–720 MPa | 550–720 MPa |
| Impact toughness | Impact-tested grade under JIS G3106 | — |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Impact | — | C grade: 34 J at 0 °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: SM570 · Q460C. Substitution decisions for certified parts stay with the design authority.