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As part of a study for the mechanical properties of spring steel, investigation was made on the effects of sorbitic microstructure, containing proeutectoid ferrite or hardness gradient, on the mechanical properties of C and Mn-Cr steels. Specimens were prepared mainly from spring steels and also from structural steels or casehardening steels for a supplementary pourpose. They were quenched & tempered, highfrequency induction-hardened & tempered, or quenched after carburizing & tempered, and divided into following two groups: A. Specimens, heat-treated to the spring hardness (Hv 400 approx.) throughout the diameter and containing 0-35% of proeutectoid ferrite.

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