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SKD61 is a high chromium alloy tool steel with high hardness and wear resistance after heat treatment and hardenability. It has good dimensional stability and hot hardness. it is suitable for producing high precision long life hot work die mould.
This article will give an overview of SKD61 chromium hot-work steels.
The following table shows the chemical composition of SKD61 tool steels.
| Element | Content (%) |
|---|---|
| Chromium, Cr | 4.75-5.50 |
| Molybdenum, Mo | 1.10-1.75 |
| Silicon, Si | 0.80-1.20 |
| Vanadium, V | 0.80-1.20 |
| Carbon, C | 0.32-0.45 |
| Nickel, Ni | 0.3 |
| Copper, Cu | 0.25 |
| Manganese, Mn | 0.20-0.50 |
| Phosphorus, P | 0.03 |
| Sulfur, S | 0.03 |
The physical properties of SKD61 tool steels are given in the following table.
| Properties | Metric | Imperial |
|---|---|---|
| Density (@20°C/68°F) | 7.80 g/cm3 | 0.282 lb/in3 |
| Melting point | 1427°C | 2600°F |
The mechanical properties of SKD61 tool steels are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength, ultimate (@20°C/68°F, varies with heat treatment) | 1200 - 1590 MPa | 174000 - 231000 psi |
| Tensile strength, yield (@20°C/68°F, varies with heat treatment) | 1000 - 1380 MPa | 145000 - 200000 psi |
| Reduction of area (@20°C/68°F) | 50.00% | 50.00% |
| Modulus of elasticity (@20°C/68°F) | 215 GPa | 31200 ksi |
| Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
The following table shows the thermal properties of SKD61 tool steels.
| Properties | Conditions | ||
|---|---|---|---|
| T (ºC) | Treatment | ||
| Thermal expansion | 10.4 x 10-6/ºC | 20-100 | - |
| Thermal conductivity | 28.6 W/mK | 215 | - |
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