H10 vs H13
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)
H13
Tool Steel
H13 is the global standard hot work tool steel for aluminum die casting and extrusion. Its Cr-Mo-V chemistry resists heat checking and thermal fatigue while keeping good toughness at working temperatures.
Standards: DIN 1.2344 · AISI H13 · JIS SKD61 · GB 4Cr5MoSiV1
Chemical composition compared (%)
| Element | H10 | H13 |
|---|---|---|
| C | 0.35–0.45 | 0.32–0.45 |
| Si | 0.80–1.20 | 0.80–1.20 |
| Mn | 0.20–0.50 | 0.20–0.50 |
| Cr | 3.00–3.75 | 4.75–5.50 |
| Mo | 2.00–3.00 | 1.10–1.75 |
| V | 0.25–0.75 | 0.80–1.20 |
Properties compared
| Property | H10 | H13 |
|---|---|---|
| Delivery condition | Annealed | Annealed |
| Working hardness | 38–50 HRC | 44–52 HRC |
| Density | 7.80 g/cm³ | 7.80 g/cm³ |
| Thermal fatigue | Excellent for hot work | — |
| Hot hardness | — | Excellent to ~600 °C |
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 · H13. Substitution decisions for certified parts stay with the design authority.