P355GH 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.
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)
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 | P355GH | A516 Gr.70 |
|---|---|---|
| C | 0.10–0.22 | ≤0.27 (≤12.5 mm) |
| Si | ≤0.60 | 0.15–0.40 |
| Mn | 1.10–1.70 | 0.85–1.20 |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.015 | ≤0.025 |
| Cr | ≤0.30 | — |
| Ni | ≤0.30 | — |
Properties compared
| Property | P355GH | A516 Gr.70 |
|---|---|---|
| Yield strength | ≥355 MPa (≤16 mm) | ≥260 MPa |
| Tensile strength | 510–650 MPa | 485–620 MPa |
| Impact | Tested at 20 °C per EN 10028-2 | — |
| 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: P355GH · A516 Gr.70. Substitution decisions for certified parts stay with the design authority.