A537 Cl.1 vs P265GH
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.
A537 Cl.1
Structural & HSLA Steel
ASTM A537 Class 1 is a heat-treated carbon-manganese-silicon vessel plate — essentially A516 chemistry given a normalizing treatment to refine the grain and lift toughness and strength for thicker, more demanding vessels and low-temperature storage.
Standards: AISI A537 Class 1
P265GH
Structural & HSLA Steel
P265GH is the EN 10028-2 workhorse pressure-vessel steel for European boiler and vessel fabrication — the normalized C-Mn grade that sits a step below P355GH in strength. Its GH suffix marks it as proven for high-temperature (elevated-temperature) service.
Standards: DIN 1.0425 (P265GH) · AISI A516 Gr.70 (near) · JIS SGV410 (near) · GB Q245R (near)
Chemical composition compared (%)
| Element | A537 Cl.1 | P265GH |
|---|---|---|
| C | ≤0.24 | ≤0.20 |
| Si | 0.15–0.50 | ≤0.40 |
| Mn | 0.70–1.35 (≤40 mm) | 0.80–1.40 |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.025 | ≤0.010 |
| Cu | ≤0.35 | ≤0.30 |
| Ni | ≤0.25 | ≤0.30 |
| Cr | ≤0.25 | ≤0.30 |
| Mo | ≤0.08 | ≤0.08 |
Properties compared
| Property | A537 Cl.1 | P265GH |
|---|---|---|
| Yield strength | ≥345 MPa (≤65 mm) | ≥265 MPa |
| Tensile strength | 485–620 MPa (≤65 mm) | 410–530 MPa |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
| Service | — | Elevated-temperature pressure equipment (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: A537 Cl.1 · P265GH. Substitution decisions for certified parts stay with the design authority.