公开(公告)号：US20200377980A1

公开(公告)日：2020-12-03

申请号：US16636792

申请日：2018-09-21

申请人： JFE Steel Corporation

发明人： Hidetaka Kawabe ,  Mitsuyuki Fujisawa ,  Hiroshi Shimizu ,  Tomohiko Uchino

IPC分类号： C22C38/60 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

摘要： Provided is a hot-rolled and annealed ferritic stainless steel sheet excellent in surface quality after bending work has been performed.A hot-rolled and annealed ferritic stainless steel sheet has a thickness of 5.0 mm or more and a chemical composition containing, by mass %, C: 0.001% to 0.025%, Si: 0.05% to 0.70%, Mn: 0.05% to 0.50%, P: 0.050% or less, S: 0.01% or less, Cr: 10.0% to 18.0%, Ni: 0.01% to 1.00%, Al: 0.001% to 0.10%, N: 0.001% to 0.025%, Ti: 0.01% to 0.40%, and a balance of Fe and inevitable impurities, in which a difference between maximum and minimum values of an average crystal grain diameter determined by using measuring method 1 is 50 μm or less, and in which a difference between maximum and minimum values of a crystal grain elongation rate determined by using measuring method 2 is 5.0 or less.

公开(公告)号：US11377702B2

公开(公告)日：2022-07-05

申请号：US17256002

申请日：2019-04-22

申请人： JFE STEEL CORPORATION

发明人： Hidetaka Kawabe ,  Mitsuyuki Fujisawa ,  Hiroshi Shimizu ,  Tomohiko Uchino

IPC分类号： C21D8/02 ,  C21D9/46 ,  C22C38/50 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C21D6/00

摘要： A ferritic stainless steel sheet comprises: a predetermined chemical composition, wherein a difference between a maximum value and a minimum value of Vickers hardness in a thickness direction is HV 50 or less.

公开(公告)号：US11174540B2

公开(公告)日：2021-11-16

申请号：US16636792

申请日：2018-09-21

申请人： JFE Steel Corporation

发明人： Hidetaka Kawabe ,  Mitsuyuki Fujisawa ,  Hiroshi Shimizu ,  Tomohiko Uchino

IPC分类号： C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/50 ,  C22C38/60 ,  C21D9/46 ,  C22C38/00 ,  C22C38/46 ,  C22C38/48 ,  C22C38/54

摘要： Provided is a hot-rolled and annealed ferritic stainless steel sheet excellent in surface quality after bending work has been performed.
A hot-rolled and annealed ferritic stainless steel sheet has a thickness of 5.0 mm or more and a chemical composition containing, by mass %, C: 0.001% to 0.025%, Si: 0.05% to 0.70%, Mn: 0.05% to 0.50%, P: 0.050% or less, S: 0.01% or less, Cr: 10.0% to 18.0%, Ni: 0.01% to 1.00%, Al: 0.001% to 0.10%, N: 0.001% to 0.025%, Ti: 0.01% to 0.40%, and a balance of Fe and inevitable impurities, in which a difference between maximum and minimum values of an average crystal grain diameter determined by using measuring method 1 is 50 μm or less, and in which a difference between maximum and minimum values of a crystal grain elongation rate determined by using measuring method 2 is 5.0 or less.