A537 Cl.1 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.
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
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 | A537 Cl.1 | A516 Gr.70 |
|---|---|---|
| C | ≤0.24 | ≤0.27 (≤12.5 mm) |
| Si | 0.15–0.50 | 0.15–0.40 |
| Mn | 0.70–1.35 (≤40 mm) | 0.85–1.20 |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.025 | ≤0.025 |
| Cu | ≤0.35 | — |
| Ni | ≤0.25 | — |
| Cr | ≤0.25 | — |
| Mo | ≤0.08 | — |
Properties compared
| Property | A537 Cl.1 | A516 Gr.70 |
|---|---|---|
| Yield strength | ≥345 MPa (≤65 mm) | ≥260 MPa |
| Tensile strength | 485–620 MPa (≤65 mm) | 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: A537 Cl.1 · A516 Gr.70. Substitution decisions for certified parts stay with the design authority.