Hot Work Tool Steel
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| W303 Bohler W303: Equivalent* 1.2367 |
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Chemical composition (average %)
| C | Si | Mn | Cr | Mo | V | |
| W303 | 0.38 | 0.40 | 0.40 | 5.00 | 2.80 | 0.55 |
Material characteristic and use
| Properties | Hot work tool steel featuring excellent hot tensile properties, high retention of hardness, good toughness and resistance of hardness, good toughness and resistance to heat checking, admits water cooling. BOHLER W303 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. 54 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) | 7.85 | 7.69 | 7.65 | |||||
| Thermal conductivity | W/(m·K) | 29 | 30.4 | 31.1 | 31.1 | 30.4 | 29.2 | 28.8 | |
| Specific heat | J/(kg·K) | 460 | 550 | 590 | |||||
| Electrical resistivity | Ohm·mm2/m | 0.50 | 0.84 | 0.94 | |||||
| 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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