High Speed Steel
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| S790 PM Bohler S790 PM: Equivalent* M3 Cl.2, 1.3345, DEX20, HAP10 |
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Chemical composition (average %)
| C | Si | Mn | Cr | Mo | V | W | |
| S790 PM | 1.29 | 0.60 | 0.30 | 4.20 | 5.00 | 3.00 | 6.30 |
Material characteristic and use
| Properties | High speed steel produced by powder-metallurgy methods with good red hardness, compressive strength and wear resistance. The PM technology imparts to the material also excellent toughness and machinability properties, e.g. highly satisfactory grindability. |
| Application | Heavy-duty machining tools Not only for the machining of steels but also for nonferrous metals such as nickel- base and titanium alloys. e.g. shaper cutters, hobs, milling cutters, broaching tools of all types, taps, twist drills, chasing tools, reamers, bimetal strips for saw blades. Tools used under extreme compressive stress e.g. precision blanking tools for high-strength materials ● shaping punches ● dies |
| 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) | 8.0 | |||||||
| Thermal conductivity | W/(m·K) | 24.0 | |||||||
| Specific heat | J/(kg·K) | 420 | |||||||
| Electrical resistivity | Ohm·mm2/m | 0.54 | |||||||
| Modulus of elasticity | N/mm2 | 230x103 | |||||||
| 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
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