EH40 vs EH36
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.
EH40
Structural & HSLA Steel
EH40 is the arctic member of the 390 MPa hull-steel family: same chemistry window as AH40/DH40, but impact-certified at −40 °C. Ice-classed vessels, Arctic offshore units and cold-climate port structures are its home ground.
Standards: AISI A131 EH40 · JIS KE40 (near) · GB EH40 (GB/T 712)
EH36
Structural & HSLA Steel
EH36 is the premium 355 MPa hull grade with impact toughness guaranteed at −40 °C — standard for LNG/LPG carriers, ice-going ships and Arctic offshore structures. It is the toughest of the widely traded 36-series ship plate.
Standards: AISI A131 EH36 · JIS KE36 (near) · GB EH36 (GB/T 712)
Chemical composition compared (%)
| Element | EH40 | EH36 |
|---|---|---|
| C | ≤0.18 | ≤0.18 |
| Si | ≤0.50 | ≤0.50 |
| Mn | 0.90–1.60 | 0.90–1.60 |
| P | ≤0.035 | ≤0.035 |
| S | ≤0.035 | ≤0.035 |
| Note | Nb/V/Ti grain-refining per class rules | Nb/V/Ti grain-refining per class rules |
Properties compared
| Property | EH40 | EH36 |
|---|---|---|
| Yield strength | ≥390 MPa | ≥355 MPa |
| Tensile strength | 510–660 MPa | 490–630 MPa |
| Impact | −40 °C, ≥41 J longitudinal (≤50 mm) | −40 °C, ≥34 J longitudinal (≤50 mm) |
| 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: EH40 · EH36. Substitution decisions for certified parts stay with the design authority.