METHOD OF PREVENTING OUTFLOW OF MATERIAL UNADAPTABLE TO QUENCHING CRACK FLAW STANDARD OF HARDENING/ TEMPERING MATERIAL BY LEAKAGE MAGNETIC FLUX FLAW DETECTOR

摘要

PROBLEM TO BE SOLVED: To provide a method of eliminating an accidental outflow to a subsequent process of a material unadaptable to the flaw standard as an unadaptable material in the determination of a quenching crack flaw of a hardening/ tempering steel material by a leakage magnetic flux flaw detector. SOLUTION: A method for preventing the outflow of a material incompatible with the flaw standard comprises: first detecting leakage magnetic fluxes 4 by a leakage magnetic flux flaw detector to determine quenching crack flaws 2 of hardened/tempered steel materials such as a steel bar 1 according to a determination standard stricter than the customer standard to distinguish compatible materials from incompatible materials; and then determining steel materials once determined as the incompatible materials according to the customer standard of flaw depth after further polish of the quenching crack flaw 2 site to distinguish determination-pass materials from materials incompatible with flaw standard. COPYRIGHT: (C)2004,JPO