SKD7 vs H10
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.
SKD7
Tool Steel
SKD7 is a JIS hot work tool steel of the 3% Cr–3% Mo–V type, the near counterpart of AISI H10. Its molybdenum-rich chemistry trades some of the 5% Cr grades’ oxidation margin for high hot strength and resistance to heat checking in forging and extrusion service.
Standards: DIN 1.2365 (32CrMoV12-28, near) · AISI H10 (near) · JIS SKD7 (JIS G4404) · GB 3Cr3Mo3V (near)
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)
Chemical composition compared (%)
| Element | SKD7 | H10 |
|---|---|---|
| C | 0.28–0.35 | 0.35–0.45 |
| Si | ≤0.50 | 0.80–1.20 |
| Mn | ≤0.60 | 0.20–0.50 |
| P | ≤0.030 | — |
| S | ≤0.020 | — |
| Cr | 2.70–3.20 | 3.00–3.75 |
| Mo | 2.50–3.00 | 2.00–3.00 |
| V | 0.40–0.70 | 0.25–0.75 |
Properties compared
| Property | SKD7 | H10 |
|---|---|---|
| Delivery condition | Annealed | Annealed |
| Working hardness | 44–52 HRC | 38–50 HRC |
| Density | 7.80 g/cm³ | 7.80 g/cm³ |
| Hot hardness | Good to ≈550 °C | — |
| 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: SKD7 · H10. Substitution decisions for certified parts stay with the design authority.