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Synopsis: The changes in hardness and notch toughness with tempering of mild steels (10 mm0), water-quenched from high temperatures above 1200•Ž, were studied with particular reference to the effect of sulfur content. The results obtained were as follows; (1) On tempering at temperatures above 500•Ž, it was observed that the resistance to softening increases with increasing sulfur content. This effect of sulfur was found to be dependent on the solid-solution hardening of ferrite, caused by the increase of solubility of sulfur. (2) It was shown that the relation between quenching temperature and hardness tempered at a temperature above 600•Ž corresponds approximately with the relation between the temperature and solubility sulfur in austenite. (3) Sulfur dissolved in the matrix acted to reduce the notch toughness in the mild steel containing higher sulfur. (4) Mild steels quenched from high temperature were superior in notch toughness to Ni-Cr steels containing similar amount of sulfur. (Received July 6, 1968)

Influence of Sulfur on Hardness and Notch Toughness on Tempering of Mild Steels Quenched from High Temperature