METHOD FOR PREVENTING CRACK OF HOT ROLLED AUSTENITIC STAINLESS STEEL COIL CONTAINING HIGH CONTENT OF DELTA FERRITE

摘要

PURPOSE: A method is provided to prevent surface and edge crack by performing hot rolling process during the heating process and improving resolution of delta ferrite. CONSTITUTION: A method comprises the steps of heating the austenitic stainless steel slab at a temperature of 1150 to 1250 Deg.C for a time period of 0.7 minute x slab thickness to 1.8 minutes x slab thickness, wherein the stainless steel slab contains delta ferrite of 8 or higher and the calculation result of Cr + Mo + 1.5 x Si is 22 or higher from among the steel ingredient; hot rolling the stainless steel slab at a draft percentage of 5 to 50; and heating and hot rolling the stainless steel slab in the above-described process. Thus, hot rolled coil with a superior surface quality having no edge or surface crack is obtained.