H11 vs SKD61
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.
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
SKD61
Tool Steel
SKD61 is the JIS designation of the H13 hot work steel family — the grade name seen on Japanese, Korean and Taiwanese certificates for die casting and extrusion tooling.
Standards: DIN 1.2344 · AISI H13 · JIS SKD61 · GB 4Cr5MoSiV1
Chemical composition compared (%)
| Element | H11 | SKD61 |
|---|---|---|
| C | 0.33–0.41 | 0.35–0.42 |
| Si | 0.80–1.20 | 0.80–1.20 |
| Mn | 0.20–0.50 | ≤0.50 |
| Cr | 4.80–5.50 | 4.80–5.50 |
| Mo | 1.10–1.50 | 1.00–1.50 |
| V | 0.30–0.50 | 0.80–1.15 |
Properties compared
| Property | H11 | SKD61 |
|---|---|---|
| Delivery condition | Annealed | Annealed |
| Working hardness | 44–54 HRC | 43–52 HRC |
| Density | 7.80 g/cm³ | 7.80 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: H11 · SKD61. Substitution decisions for certified parts stay with the design authority.