Masayoshi Tagaya, Imao Tamura and Katsutaro Akamatsu
Ball-Bearing steel containing 0.98% carbon and 1.40% chromium has been subjected to the continuous-cooling transformation study in order to determine the continuous cooling transformation diagram with Liedholm's method in view of the fact that although many of the continuous cooling transformation diagrams for various kinds of steel have been determined, few curves for high carbon and low alloy steel have been established,and also intending to establish better relationships among the hardenability of steel, its dimension and the cooling ability of coolant than that by M. A. Grossmann according to the findings derived from the continuous cooling transformation diagram and the ``Mother Cooling Curve''. The diagram determined here is as shown in Fig. 8. With a view of checking the validity of the diagram so determined, the cooling curves of round bars quenched in various coolants were also measured and compared with the diagram.
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