Production condition determining method of cold-rolled steel sheet, manufacturing condition determining device and a manufacturing condition determination program

摘要

PROBLEM TO BE SOLVED: To provide a manufacturing condition determination method, a manufacturing condition determination device, and a manufacturing condition determination program of a cold rolled steel sheet capable of determining manufacturing conditions of a cold rolled steel sheet having desired mechanical properties without carrying out trial and error by experiments.;SOLUTION: The manufacturing condition determination method includes: a target structure determination step for determining a target ferrite fraction or the like for obtaining desired mechanical properties; a manufacturing condition input step; a continuous annealing time calculation step; an austenite grain size calculation step; a ferrite fraction calculation step; a martensite hardness calculation step; a structure comparison and judge step for judging whether a difference of the target ferrite fraction or the like and the ferrite fraction or the like exceeds a predetermined certain threshold value or not; and a manufacturing condition correction step for correcting a heating temperature, a quenching temperature, and a tempering temperature input in the manufacturing condition input step based on the judging result. The calculation operations of the austenite grain size, the ferrite fraction, and the martensite hardness are repeatedly carried out until the correction ends.;COPYRIGHT: (C)2013,JPO&INPIT