A516 Gr.65 vs P355GH
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)
P355GH
Structural & HSLA Steel
P355GH is the EN 10028-2 carbon steel for pressure purposes at elevated temperature — the European counterpart of A516 Gr.70 for boilers and PED vessels. The GH suffix denotes guaranteed high-temperature proof strength.
Standards: DIN 1.0473 (P355GH) · AISI A516 Gr.70 (near) · JIS SGV480 (near) · GB Q345R (near)
Chemical composition compared (%)
| Element | A516 Gr.65 | P355GH |
|---|---|---|
| C | ≤0.24 (≤12.5 mm) | 0.10–0.22 |
| Si | 0.15–0.40 | ≤0.60 |
| Mn | 0.85–1.20 | 1.10–1.70 |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.025 | ≤0.015 |
| Cr | — | ≤0.30 |
| Ni | — | ≤0.30 |
Properties compared
| Property | A516 Gr.65 | P355GH |
|---|---|---|
| Yield strength | ≥240 MPa | ≥355 MPa (≤16 mm) |
| Tensile strength | 450–585 MPa | 510–650 MPa |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Impact | — | Tested at 20 °C per EN 10028-2 |
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 · P355GH. Substitution decisions for certified parts stay with the design authority.