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EN47  Technical Data  EN47 is a tough oil quenching spring steel which, when heat treated, offers good wear resistance. TYPICAL ANALYSIS C. Mn. Cr. V. 0.50% 0.75% 1.00% 0.15% Forging: Forge at 1050°C. Do not work this steel when it has fallen below 840°C. Annealing: Slow furnace cool from 840°/860°C. Hardening: Pre heat slowly to 650/700°C and thoroughly soak. Continue heating to the final hardening temperature of 850/870°C and allow the component to be heated through. Quench in oil. Tempering: Temper immediately after quenching whilst tools are still hand warm. Re-heat to the tempering temperature, soak for one hour per  25 millimetre of total thickness, 2 hours minimum, then cool in air. For most applications tempering will be between 400°/600°C. Tempering °C   100   200   300    400 450 500 550 600 HRc 56 53 50   49 46 44 40 36