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M2      Technical Data BS4659BM2 is a general purpose high speed steel. M2 high speed steel offers good wear resistance with excellent toughness and cutting power. TYPICAL ANALYSIS   C. Cr. Mo. W. V. 0.83% 4.10% 5.00% 6.40% 1.90% Forging:  The forging temperature for high speed steels is 1050°/1150°C. Do not charge direct into the high temperature part of the furnace, but pre-heat slowly to 850°/900. The heat should then be increased more quickly to the forging temperature. If, during the forging, the temperature of the material drops below 880/900°C, re heating will be necessary.  Cool very slowly after forging. Annealing:  Annealed at 850°C. Soak thoroughly at this temperature and furnace cool.   Hardening: Pre heat slowly to 840°C/860°C and thoroughly soak. Continue heating to the final hardening temperature of 1230/1250°C and allow the component to be heated through. Quench in oil or cool in air. Great care must be take not to allow the tools to remain too long at the hardening temperature.   Tempering:  Heat uniformly and thoroughly at the selected tempering temperature and hold for at least  two hours (one hour per inch of total thickness). Double tempering of M2 high speed steel is essential with intermediate cooling to room temperature between tempers. Tempering °C     500     550     600    650 HRc  64  65  64  61