On-line non-destructive quality test method by measuring transformation rate

摘要

The present invention relates to an on-line non-destructive testing method of a steel sheet, in which a change in the thickness of a steel sheet during austenite cooling in a steel sheet securing toughness using martensitic transformation is measured, martensitic transformation is measured from the change, It is determined whether the material is defective or not.;This method not only improves the reliability of the inspection but also eliminates the problem due to the time gap until the inspection result is obtained, compared with the conventional destructive inspection.