公开(公告)号：US20180171445A1

公开(公告)日：2018-06-21

申请号：US15736945

申请日：2016-06-17

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kazuo HIKIDA ,  Motonori HASHIMOTO ,  Kengo TAKEDA ,  Ken TAKATA

IPC分类号： C22C38/60 ,  C21D8/02 ,  C21D9/46 ,  C22C38/58 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00

CPC分类号： C22C38/60 ,  C21D1/32 ,  C21D1/76 ,  C21D1/84 ,  C21D8/0226 ,  C21D8/0263 ,  C21D9/46 ,  C21D2211/004 ,  C21D2211/005 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/58

摘要： A steel plate improved in formability and wear resistance, having a predetermined chemical composition, having a metal structure of the steel plate having a ratio of number of carbides at ferrite grain boundaries with respect to a number of carbides in ferrite grains of over 1 and having a ferrite grain size of 5 μm to 50 μm, and having a Vickers hardness of steel plate of 100 HV to 170 HV.

公开(公告)号：US20180105891A1

公开(公告)日：2018-04-19

申请号：US15565096

申请日：2016-04-08

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kazuo HIKIDA ,  Motonori HASHIMOTO ,  Kengo TAKEDA ,  Ken TAKATA

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

CPC分类号： C21D8/0263 ,  C21D8/0205 ,  C21D8/0226 ,  C21D9/46 ,  C21D2211/005 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06

摘要： The present invention provides a steel sheet having an excellent cold workability during forming and a method for producing the same. The steel sheet of the present invention is characterized in that: (a) the ratio of the number of carbides at the ferrite grain boundary to the number of carbides in the ferrite grain exceeds 1, (b) the ferrite grain diameter is 5 μm or more and 50 μm or less, (c) the in-plane anisotropy |Δr| of the r value is 0.2 or less, (d) the Vickers hardness is 100 HV or more and 150 HV or less, (e) the random intensity ratio of the {311} orientation at the ½-thickness portion of the steel sheet is 3.0 or less.

公开(公告)号：US20180230582A1

公开(公告)日：2018-08-16

申请号：US15576177

申请日：2016-05-25

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kengo TAKEDA ,  Kazuo HIKIDA ,  Ken TAKATA ,  Motonori HASHIMOTO ,  Toshimasa TOMOKIYO ,  Yasushi TSUKANO ,  Takashi ARAMAKI

IPC分类号： C22C38/60 ,  C21D8/04 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC分类号： C22C38/60 ,  C21D8/02 ,  C21D8/0463 ,  C21D9/46 ,  C22C38/00 ,  C22C38/001 ,  C22C38/002 ,  C22C38/005 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

摘要： Low carbon steel plate excellent impact resistance characteristics after carburizing and quenching and after tempering, characterized by having a predetermined chemical composition, an average grain size of carbides of 0.4 μm to 2.0 μm, an area ratio of pearlite of 6% or less, a ratio of a number of carbides at the ferrite grain boundaries to the number of carbides inside the ferrite grains of over 1, and a Vickers hardness of 100HV to 180HV.

公开(公告)号：US20180135146A1

公开(公告)日：2018-05-17

申请号：US15576682

申请日：2016-05-26

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Ken TAKATA ,  Kazuo HIKIDA ,  Kengo TAKEDA ,  Motonori HASHIMOTO

IPC分类号： C21D9/46 ,  C22C38/38 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/20 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00

摘要： A steel sheet improved in hardenability and material formability having a predetermined chemical composition, characterized in that, in the metal structure of the steel sheet, an average grain size of carbides is 0.4 μm to 2.0 μm, an area ratio of pearlite is 6% or less, when a number of carbides in ferrite grains is A and a number of carbides at ferrite grain boundaries is B, B/A>l, and when an X-ray diffraction intensity at {211} at a plane of a part of ½ sheet thickness of the steel sheet is denoted by “I1” and an X-ray diffraction intensity at {100} is denoted by “I0”, I1/I0

公开(公告)号：US20180127848A1

公开(公告)日：2018-05-10

申请号：US15576653

申请日：2016-05-26

申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION

发明人： Kazuo HIKIDA ,  Ken TAKATA ,  Kengo TAKEDA ,  Motonori HASHIMOTO

IPC分类号： C21D9/46 ,  C22C38/60 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/22 ,  C22C38/16 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00

CPC分类号： C21D9/46 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0263 ,  C21D2211/005 ,  C21D2211/009 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/60 ,  C23G1/00

摘要： The present invention provides steel sheet excellent in cold formability and ductility after heat treatment and a method for production thereof. The steel sheet of the present invention is steel sheet which has a chemical composition containing, by mass %, C: 0.10 to 0.40%, Si: 0.30 to 1.00%, Mn: 0.30 to 1.00%, Al: 0.001 to 0.10%, P: 0.0001 to 0.02%, and S: 0.0001 to 0.01% and having a balance of Fe and impurities, which steel sheet characterized in that a ratio (B/A) of the number of carbides at the ferrite grain boundaries (B) to the number of carbides inside the ferrite grains (A) is over 1, a ferrite grain size is 5 μm to 50 μm, an average grain size of carbides is 0.4 μm to 2.0 μm, a pearlite area ratio is 6% or less, and a Vicker's hardness is 120 HV to 170 HV.