Abstract
The features of cooling curves for oils using a silver specimen (JIS K-2242) were shown. The cooling curves of steel specimens for the same oils were also measured and compared with those of silver specimen. The CCT diagrams of steels were classified into four types and the temperature range in which rapid cooling is required for quench-hardening for each type of steel was determined and compared with the temperature range for the boiling stage in the quenching of steel, converted from the results obtained from a silver specimen. The V-value is defined as the ratio of the temperature range of the boiling stage to the temperature range which requires rapid cooling. The V-value is a better criterion for quench hardening in oil quenching for given steel than the H-value as a measure of quench severity.
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