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Carbon		1.05 - 1.15
Chromium		3.5 - 4.25
Cobalt		7.75 - 8.75
Iron		Balance
Manganese		0.15 - 0.4
Molybdenum		9 - 10
Phosphorus		0.03 max
Silicon		0.15 - 0.65
Sulphur		0.03 max
Tungsten		1.15 - 1.85
Vanadium		0.95 - 1.35

Principal Design Features		Capable of very high hardness values, this is a moly type high speed tool steel. The alloy has excellent hot hardness and wear resistance and is commonly employed to machine difficult to machine materials including the superalloys.

Applications		Typically employed to machine the superalloys and exotic, M42 is employed in drills, hobs, taps, end mills, milling cutters, form and gear cutters, broaches and chasers.

Machinability		Rated at 45% of a 1% carbon steel, the alloy, in its annealed condition, can be turned, drilled, tapped, milled, broached and threaded.

Forming		See forging.

Heat Treatment		See annealing, tempering and hardening.

Forging		Preheat slowly to 1600 F and soak, then heat rapidly to 2000 F. Do not work at temperatures below 1800 F. Cool forgings slowly.

Annealing		Heat thoroughly at 1600 F, followed by slow furnace cooling.

Tempering		Triple temper at 1000 - 1100 F, cooling completely between cycle for best results.

Hardening		Preheat to 1600 F and soak completely, then heat directly to 2200 F. Quenching should be done in a salt media at 1000 F followed by air cooling. Tempering should be done in salt baths or in vacuum furnaces.

Physical Data : [top]

Density (lb / cu. in.)	0.296

MSO currently has no data available for this grade.