公开(公告)号：US20230357905A1

公开(公告)日：2023-11-09

申请号：US18004437

申请日：2021-03-23

申请人： Tata Steel Limited

发明人： Appa Rao Chintha ,  M.B.N. Raju ,  Pankaj Raju ,  Basavaraj P Kalinganavar ,  V.K. Shah ,  Monojit Dutta ,  Avtar Singh Saini ,  Sanjay Chandra ,  Vinay V. Mahshabde

IPC分类号： C22C38/12 ,  C21D8/02 ,  C21D9/00

CPC分类号： C22C38/12 ,  C21D8/0205 ,  C21D9/0081 ,  C21D8/0226 ,  C21D2211/001

摘要： The present disclosure discloses a method for producing high strength hot rolled steel. The method includes casting a steel slab of a composition, comprising in weight %: carbon (C) of about 0.45 wt. %-1.2 wt. %, manganese (Mn) of about 0.0-1.0 wt. %, silicon (Si) of about 0.0-0.5 wt. %, niobium (Nb) up-to 0.03 wt. %, sulphur (S) up-to 0.05 wt. % of S, phosphorous (P) up-to 0.05 wt. %, nitrogen (N) 0.002 wt. %-0.012 wt. % and balance being Iron (Fe) optionally along with incidental elements. The method also involves, heating, hot rolling, cooling, coiling the steel and retaining the steel at an ambient temperature to produce high strength hot rolled steel with 75-95% spheroid microstructure and 5-25% pearlite microstructure.