STEEL SHEET WITH LESS WELD BUCKLING DEFORMATION, AND PROCESS FOR PRODUCING THE SAME

摘要

A steel sheet with less welding-buckling deformation that suppresses any out-of-plane buckling deformation called "scrawny horse deformation" at welding sites as effectively as possible especially in weld building of a hull structure is provided through controlling of the component composition and strength characteristics of steel material, especially the balance between base material strength and strength after being affected by welding heat. When the yield stress of the steel sheet is referred to as YP0 and the yield stress of the steel sheet after application of the thermal history appearing in the description that simulates thermal influences during welding is referred to as YP1, the YP0 is 400 MPa or greater, and the ratio of YP0/YP1 is 1 or higher.