Hot Work Tool Steel
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| W302 Bohler W302: Equivalent* SKD61, H13, 1.2344, DHA1, DAC |
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Chemical composition (average %)
| C | Si | Mn | Cr | Mo | V | |
| W302 | 0.39 | 1.10 | 0.40 | 5.20 | 1.30 | 0.95 |
Material characteristic and use
| Properties | Hot work tool steel featuring excellent hot tensile properties, high hot wear resistance, adequate toughness and heat checking resistance; admits water cooling. BOHLER W302 is also available in the special grades ISODISC and ISOBLOC with improved homogeneity and increased toughness. |
| Application | Heavy duty hot work tools and dies, mainly for light alloy processing: mandrels, dies, and containers for metal tube and rod extrusion; hot extrusion equipment; tools and dies for the manufacture of hollow bodies, screws, rivets, nuts and bolts. Die casting equipment, forming dies, die inserts, hot shear blades, and plastic moulding dies. |
| Hardness after tempering | max. 55 HRC |
| As-supplied condition | Annealed: max. 205 HB |
Physical characteristics
| Temperature | |||||||||
| 20 ºC | 100 ºC | 200 ºC | 300 ºC | 400 ºC | 500 ºC | 600 ºC | 700 ºC | ||
| Density | (kg/dm3) | 7.80 | 7.64 | 7.60 | |||||
| Thermal conductivity | W/(m·K) | 24.3 | 26.1 | 27.3 | 27.8 | 27.7 | 27.5 | 27.3 | |
| Specific heat | J/(kg·K) | 460 | 550 | 590 | |||||
| Electrical resistivity | Ohm·mm2/m | 0.52 | 0.86 | 0.96 | |||||
| Modulus of elasticity | 103N/mm2 | 215 | 176 | 165 | |||||
| Thermal expansion | 10-6m/(m·K) | 11.5 | 12.0 | 12.2 | 12.5 | 12.9 | 13.0 | 13.2 | |
* Chemical composition is only reference and might not be the same
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