| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for cooling a steel member capable of suppressing the development of strain after high temperature heat treatment more than the conventional method. SOLUTION: In the method for cooling the steel member after performing the heat treatment, with which the steel member is raised to austenizing temperature or higher; in a prescribed period from the start of cooling to the steel member, a decompressed cooling which cools the atmospheric gas in the decompressed state at lower than the atmospheric pressure, is performed. The decompressed cooling is desirable to be performed while stirring the atmospheric gas in the decompressed state at lower than the atmospheric pressure. The decompressed cooling is desirable to be performed at least till wholly completing the transformation of the structure in the steel member. The decompressed state of the atmospheric gas in the decompressed cooling is desirable to be in the range of 0.1-0.65 bar. COPYRIGHT: (C)2008,JPO&INPIT |
