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EN45    251A58  Technical Data EN45 is a silicon mangenese spring steel, supplied in the as rolled contition. This steel is suitable for oil hardening and tempering. TYPICAL ANALYSIS   C. Si. Mn. S. P. 0.55% 1.75% 0.75% 0.05% 0.05% Forging: Forge at 1150°C. Annealing: Slow furnace cool from 840°/900°C. Hardening: Pre heat slowly to 650/700°C and thoroughly soak. Continue heating to the final hardening temperature of 870/930°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°/550°C.