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EN8   080M40  Technical Data EN8 is an unalloyed medium carbon steel with good tensile strength. It is normally supplied in cold drawn or as rolled. Tensile properties can vary but are usually between 500-800 N/mm2.   TYPICAL ANALYSIS   C. Si. Mn. S. P. 0.40% 0.25% 0.80% 0.05% 0.05% Hardening: Heat uniformly to 830/860°C until heated through. Quench in oil or water. Can also be induction or flame hardened. Tempering: Heat uniformly and thoroughly at the selected tempering temperatures, between 550°C to 660°C and hold at heat for one hour per inch of total thickness. Normalising: Normalise at 830-860°C, and cool in air.