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M42 super high speed steel is a premium cobalt high speed steel with a chemical composition designed for high hardness and superior hot hardness. These properties make the steel an excellent choice for machining high-strength and pre-hardened steels, high-hardness alloys and the difficult-to-machine, nonferrous super-alloys used in the aerospace, oil, and power generation industries. M42 super high speed steel exhibits excellent wear resistance by virtue of high heat-treated hardness (68 to 70 HRC), and the high cobalt content imparts the hot hardness. As such, the cutting edges on tools made from M42 super high speed steel stay sharp and hard in heavy-duty and high-production cutting applications. Typical applications for M42 super high speed steel include twist drills, taps, milling cutters, reamers, broaches, saws, knives and thread rolling dies.
| Weight % | C | Cr | Co | Fe | Mo | Si | W | V |
|---|---|---|---|---|---|---|---|---|
| Typical composition | 1.08 | 3.85 | 8.00 | 74.42 | 9.50 | 0.45 | 1.50 | 1.20 |
| Characteristics | English | Metric | ||
|---|---|---|---|---|
| Nominal density
(68°F/20°C) |
0.282 lbs/in3 | 7.81 g/cm3 | ||
| Critical Temperature | 1560 °F | 849 °C | ||
| Hardness, Rockwell C | Oil quenched from 1204°C, 5 minutes | 64.3 | ||
| Oil quenched from 1177°C, 5 minutes | 65.5 | |||
| Oil quenched from 1163°C | 65.8 | |||
| Modulus of Elasticity | 30000 ksi | 207 GPa | ||
| Izod Impact Unnotch | Oil Quenched at 1191°C; 510°C Temper Temperature | 10.0 ft-lb | 13.6 J | |
| Oil Quenched at 1191°C; 622°C Temper Temperature | 18.0 ft-lb | 24.4 J | ||
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