EH40
Data verifiedEH40 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.
Chemical composition
| Element | Content (%) |
|---|---|
| C | ≤0.18 |
| Si | ≤0.50 |
| Mn | 0.90–1.60 |
| P | ≤0.035 |
| S | ≤0.035 |
| Note | Nb/V/Ti grain-refining per class rules |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Yield strength | ≥390 MPa |
| Tensile strength | 510–660 MPa |
| Impact | −40 °C, ≥41 J longitudinal (≤50 mm) |
| Density | 7.85 g/cm³ |
Heat treatment
Supplied normalized or TMCP under class survey; fine-grain practice is mandatory at this toughness level.
Equivalent grades
| Standard | Designation |
|---|---|
| aisi | A131 EH40 |
| jis | KE40 (near) |
| gb | EH40 (GB/T 712) |
Compare side by side: EH40 vs AH40 · EH40 vs DH40 · EH40 vs EH36
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Ice-going and polar vessels, Arctic offshore structures, cold-region marine terminals.
Processing: Welding consumables must match the −40 °C toughness class; class survey certificates are part of the deliverable.
FAQ
- AH40, DH40, EH40 — same steel?
- Essentially yes: identical chemistry and strength. The letter sets the Charpy test temperature — A: 0 °C, D: −20 °C, E: −40 °C — and the mill’s grain-refining and testing practice behind it.
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Ask for a quotationVisit NasteelSource: ASTM A131 / class rules published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.