PROCESS FOR MAKING HOT ROLLED STEEL SHEETES WITHOUT ELONGATION OF YIELD POINT

摘要

Method for hot-rolled steel sheet is characterised by (i) heating the steel comprising below 0.2 wt.% C, below 2.0 wt.% Mn and balance Fe with inevitable impurities to 1000-1150 deg.C, (ii) finish hot rolling to 650-800 deg.C, and (iii) coiling at below 600 deg.C in case of 650-700 deg.C finish temperature and at a below temperature calculated from following formula, 2000 deg.C 2X finish temperature, in case of 700-800 deg. C finish temperature.