High Speed Steel
|
|
| S705 Bohler S705: Equivalent* SKH55, M41, 1.3243, MH55, YXM4 |
|
Chemical composition (average %)
| C | Si | Mn | Cr | Mo | V | W | Co | |
| S705 | 0.92 | 0.40 | 0.30 | 4.10 | 5.00 | 1.90 | 6.20 | 4.80 |
Material characteristic and use
| Properties | Cobalt alloyed, tungsten-molybdenum high speed steel possessing high hardness, excellent cutting properties, high red hardness and good toughness. BOHLER S705 is also available in the special grade ISORAPID for heavy duty tools. |
| Application | Turning and planing tools of all types, milling cutters, taps, twist drills, woodworking tools, cold work tools. |
| Hardness after tempering | 64-66 HRC |
| As-supplied condition | Annealed: max. 280 HB |
Physical characteristics
| Temperature | |||||||||
| 20 ºC | 100 ºC | 200 ºC | 300 ºC | 400 ºC | 500 ºC | 600 ºC | 700 ºC | ||
| Density | (kg/dm3) | 7.90 | |||||||
| Thermal conductivity | W/(m·K) | 21.0 | |||||||
| Specific heat | J/(kg·K) | 420 | |||||||
| Electrical resistivity | Ohm·mm2/m | 0.49 | |||||||
| Modulus of elasticity | N/mm2 | 224x103 | |||||||
| Thermal expansion | 10-6m/(m·K) | 11.5 | 11.7 | 12.2 | 12.4 | 12.7 | 13.0 | 12.9 | |
* Chemical composition is only reference and might not be the same
Tel 
