AISI H13 and JIS SKT4 all is hot work tool Steel. Their data as below:
H13 Tool Steel vs SKT4 Chemical Composition
| ASTM A681 | C | Si | Mn | Cr | Mo | V | P | S |
| H13 | 0.32～0.45 | 0.80～1.20 | 0.20～0.50 | 4.75～5.50 | 1.10～1.75 | 0.80～1.20 | ≤0.030 | ≤0.030 |
| JIS G4404 | C | Si | Mn | Cr | Mo | P | S | |
| SKT4 | 0.50～0.60 | 0.10～0.40 | 0.60～0.90 | 0.80～1.20 | 0.35～0.55 | 0.05～0.15 | ≤0.030 | ≤0.020 |
Different chemical composition let AISI H13 and JIS SKT4 tool steel have different Physical properties and mechanical properties
Work Temperature
- SKT4 low heat mold steel (350-370 ℃)
- H13 (4Cr5MoSiV1) toughness heat-resistant hot work die steel (550-600 ℃)
| H13 | SKT4 | ||
| Properties | Metric | Properties | Metric |
| Density (@20°C/68°F) | 7.80 g/cm3 | Density | 7.86 g/cm³ |
| Melting point | 1427°C | Melting point | 2590°F |
| Mechanical Properties | Mechanical Properties | ||
| Properties | Metric | Properties | Metric |
| Tensile strength, ultimate (@20°C/68°F, varies with heat treatment) | 1200 – 1590 MPa | Tensile strength, ultimate (@20°C/68°F, varies with heat treatment) | |
| Tensile strength, yield (@20°C/68°F, varies with heat treatment) | 1000 – 1380 MPa | Tensile strength, yield (@20°C/68°F, varies with heat treatment) | |
| Reduction of area (@20°C/68°F) | 50.00% | Reduction of area (@20°C/68°F) | |
| Modulus of elasticity (@20°C/68°F) | 215 GPa | Elastic modulus | 190-210 GPa |
| Poisson’s ratio | 0.27-0.30 | Poisson’s ratio | 0.27- 0.30 |
Application of H13 & SKT4 tool steel
Work Temperature
- SKT4 low heat mold steel (350-370 ℃)
- H13 (4Cr5MoSiV1) toughness heat-resistant hot work die steel (550-600 ℃)
Because AISI H13 have higher Cr and Mo, So the hot hardness(Red hardness) is better than JIS SKT4. But high Cr let H13 steel Impact toughness down.
In practical application, User can as needs choose H13 or JIS SKT4 Tool Steel.
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