METHOD FOR HEAT TREATMENT OF COLUMNAR WORK
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United States of America Patent
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Issued Date -
Aug 7, 2014
app pub date -
Feb 7, 2013
filing date -
Feb 7, 2013
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Abstract
The present invention relates to a method for heat treatment of a columnar work. In order to provide the method for heat treatment of a columnar work being able to attain a high productivity, a reduction of cost, and an improvement of quality, as compared with the prior art, the method for heat treatment of a columnar work of the present invention includes a quench-hardening step and a tempering step being carried out after the quench-hardening step, the quench-hardening step includes a first quench-hardening step and a second quench-hardening step being carried out after the first quench-hardening step, the entire region of the columnar work from an outer circumferential surface to a core thereof, or a partial region thereof, is heated up to a temperature not lower than a transformation temperature Ac3, and then, the work is quench-hardened.
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