A516 Gr.65 vs A516 Gr.70
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.
A516 Gr.65
Structural & HSLA Steel
ASTM A516 Grade 65 is the middle grade of the A516 pressure-vessel plate family, sitting between Gr.60 and the more common Gr.70. It offers the same fine-grain, killed, weldable practice as Gr.70 with a slightly lower strength band, which can ease forming and welding on moderate-pressure vessels.
Standards: DIN P355GH (near) · AISI A516 Gr.65 · JIS SGV450 (near) · GB Q345R (near)
A516 Gr.70
Structural & HSLA Steel
ASTM A516 Grade 70 is the most specified pressure-vessel plate in the world — the default carbon steel for ASME Section VIII vessels. Its 485–620 MPa tensile band and fine-grain, killed practice give reliable toughness and weldability across a wide thickness range.
Standards: DIN P355GH (near) · AISI A516 Gr.70 · JIS SGV480 (near) · GB Q345R (near)
Chemical composition compared (%)
| Element | A516 Gr.65 | A516 Gr.70 |
|---|---|---|
| C | ≤0.24 (≤12.5 mm) | ≤0.27 (≤12.5 mm) |
| Si | 0.15–0.40 | 0.15–0.40 |
| Mn | 0.85–1.20 | 0.85–1.20 |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.025 | ≤0.025 |
Properties compared
| Property | A516 Gr.65 | A516 Gr.70 |
|---|---|---|
| Yield strength | ≥240 MPa | ≥260 MPa |
| Tensile strength | 450–585 MPa | 485–620 MPa |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
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: A516 Gr.65 · A516 Gr.70. Substitution decisions for certified parts stay with the design authority.