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Some Properties of Work Rolls for Cold Rolling Mill, Hardened by Progressive Double Frequencies Induction Yosimasa KUBO, Taira NAKANO, Masao IKENO, and Yasusiro HAYASI Synopsis: The increment of hardened depth is effective as one of the means for prolongingthe life of work rolls for cold rolling. From this point of view, efforts have been made to increase the hardened depth. In the case of induction heating, the depth depends mainly upon its frequencies.Recently, lower frequencies have been applied rather than higher frequencies. This paper reports some properties of work rolls for cold rolling hardened by progressive induction hardening method using double frequencies of 60 and 1 200 cycles. (Received Aug. 31, 1970)