H10 vs H11
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.
H10
Tool Steel
H10 is a Cr-Mo hot work steel with lower chromium and higher molybdenum than H13, giving it better thermal conductivity and heat-check resistance in water-cooled dies. It is a long-standing choice for brass and aluminum extrusion tooling.
Standards: DIN 1.2365 · AISI H10 · JIS SKD7 · GB 3Cr3Mo3V (near)
H11
Tool Steel
H11 is a 5% chromium hot work steel similar to H13 but with less vanadium, giving slightly higher toughness and deep air hardening. Used for hot forging, die casting and aerospace structural parts (as the 4340-alternative H11 mod in some specs).
Standards: DIN 1.2343 · AISI H11 · JIS SKD6 · GB 4Cr5MoSiV
Chemical composition compared (%)
| Element | H10 | H11 |
|---|---|---|
| C | 0.35–0.45 | 0.33–0.41 |
| Si | 0.80–1.20 | 0.80–1.20 |
| Mn | 0.20–0.50 | 0.20–0.50 |
| Cr | 3.00–3.75 | 4.80–5.50 |
| Mo | 2.00–3.00 | 1.10–1.50 |
| V | 0.25–0.75 | 0.30–0.50 |
Properties compared
| Property | H10 | H11 |
|---|---|---|
| Delivery condition | Annealed | Annealed |
| Working hardness | 38–50 HRC | 44–54 HRC |
| Density | 7.80 g/cm³ | 7.80 g/cm³ |
| Thermal fatigue | Excellent for hot work | — |
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: H10 · H11. Substitution decisions for certified parts stay with the design authority.