公开(公告)号：US11242593B2

公开(公告)日：2022-02-08

申请号：US16464374

申请日：2017-11-30

申请人： JFE STEEL CORPORATION

发明人： Naoya Ihara ,  Masayuki Kasai ,  Takashi Iwamoto ,  Kimihiro Nishimura

IPC分类号： C23C8/32 ,  C21D1/06 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/10 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/32 ,  C22C38/60

摘要： Provided is a steel for nitrocarburizing that can ensure hardened case depth by suppressing precipitation of Cr, V, and Nb in a part of the surface layer very close to the surface. The provided steel comprises: a specific chemical composition satisfying 9.5≤([Cr]/52+[V]/50.9+[Nb]/92.9+M)×103≤18.5, with the balance being Fe and inevitable impurities; and a steel microstructure in which an area ratio of bainite phase with respect to the entire microstructure is more than 50%.

公开(公告)号：US10125416B2

公开(公告)日：2018-11-13

申请号：US14413549

申请日：2013-07-22

申请人： JFE STEEL CORPORATION ,  JFE Bars & Shapes Corporation

发明人： Yasuhiro Omori ,  Kiyoshi Uwai ,  Shinji Mitao ,  Takashi Iwamoto ,  Keisuke Ando ,  Kunikazu Tomita

IPC分类号： C23C8/32 ,  C21D8/06 ,  C21D9/32 ,  C21D1/06 ,  C22C38/00 ,  C22C38/60 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C21D6/00 ,  C21D8/00 ,  C23C8/04

摘要： The present invention provides a steel for nitrocarburizing having excellent mechanical workability before nitrocarburizing, and showing excellent fatigue properties after nitrocarburizing, which is suitable for applying in mechanical structural components for automobiles etc. prepared by adjusting the composition so that it contains in mass %, C: 0.01% or more and less than 0.10%, Si: 1.0% or less, Mn: 0.5% to 3.0%, P: 0.02% or less, S: 0.06% or less, Cr: 0.3% to 3.0%, Mo: 0.005% to 0.4%, V: 0.02% to 0.5%, Nb: 0.003% to 0.15%, Al: 0.005% to 0.2%, and Sb: 0.0005% to 0.02%, and the balance including Fe and incidental impurities, and setting the area ratio of bainite phase to the whole microstructure to more than 50%.

公开(公告)号：US11959177B2

公开(公告)日：2024-04-16

申请号：US17107955

申请日：2020-12-01

申请人： JFE STEEL CORPORATION

发明人： Masayuki Kasai ,  Takashi Iwamoto ,  Kunikazu Tomita

IPC分类号： C23C8/32 ,  C21D1/06 ,  C21D1/74 ,  C21D6/00 ,  C21D8/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C8/26 ,  C21D1/20 ,  C21D7/13

CPC分类号： C23C8/32 ,  C21D1/06 ,  C21D1/74 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/0226 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/30 ,  C22C38/32 ,  C22C38/38 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C8/26 ,  C21D1/20 ,  C21D7/13 ,  C21D2211/002 ,  C21D2211/004

摘要： A component comprising a core part and a surface layer is provided. The core part contains C: 0.01%≤ and

公开(公告)号：US11174543B2

公开(公告)日：2021-11-16

申请号：US16305519

申请日：2017-05-31

申请人： JFE STEEL CORPORATION

发明人： Keisuke Ando ,  Takashi Iwamoto ,  Kunikazu Tomita ,  Kazukuni Hase ,  Kimihiro Nishimura

IPC分类号： C23C8/22 ,  C21D1/06 ,  C21D8/06 ,  C21D9/32 ,  C21D9/52 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C23C8/02 ,  C23C8/80 ,  F16H55/06

摘要： A case hardening steel suitable as raw material for producing a mechanical structural part having high rotating bending fatigue strength and pitting fatigue strength at relatively low cost and a method of producing the case hardening steel are provided. A case hardening steel comprises a chemical composition containing, in mass %, C, Si, Mn, P, S, Cr, Mo, Al, N, and O in a predetermined relationship, with a balance being Fe and inevitable impurities, wherein √I≤80 (where I denotes an area (μm2) of an oxide-based inclusion located in a fish eye central portion at a fracture surface after subjecting the case hardening steel to carburizing-quenching and tempering and then performing a rotating bending fatigue test).

公开(公告)号：US20150159261A1

公开(公告)日：2015-06-11

申请号：US14413549

申请日：2013-07-22

申请人： JFE STEEL CORPORATION ,  JFE Bars & Shapes Corporation

发明人： Yasuhiro Omori ,  Kiyoshi Uwai ,  Shinji Mitao ,  Takashi Iwamoto ,  Keisuke Ando ,  Kunikazu Tomita

IPC分类号： C23C8/32 ,  C21D6/00 ,  C23C8/04 ,  C21D8/00

CPC分类号： C23C8/32 ,  C21D1/06 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/005 ,  C21D8/06 ,  C21D8/065 ,  C21D9/32 ,  C21D2211/002 ,  C21D2211/004 ,  C22C38/00 ,  C22C38/001 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C22C38/60 ,  C23C8/04

摘要： The present invention provides a steel for nitrocarburizing having excellent mechanical workability before nitrocarburizing, and showing excellent fatigue properties after nitrocarburizing, which is suitable for applying in mechanical structural components for automobiles etc. prepared by adjusting the composition so that it contains in mass %, C: 0.01% or more and less than 0.10%, Si: 1.0% or less, Mn: 0.5% to 3.0%, P: 0.02% or less, S: 0.06% or less, Cr: 0.3% to 3.0%, Mo: 0.005% to 0.4%, V: 0.02% to 0.5%, Nb: 0.003% to 0.15%, Al: 0.005% to 0.2%, and Sb: 0.0005% to 0.02%, and the balance including Fe and incidental impurities, and setting the area ratio of bainite phase to the whole microstructure to more than 50%.

摘要翻译： 本发明提供一种在氮碳共渗之前具有优异的机械加工性的氮碳共渗钢，并且在氮碳共渗之后表现出优异的疲劳特性，适用于通过调整组成使其以质量％计含有的C组成的汽车用机械结构部件 ：0.01％以上且小于0.10％，Si：1.0％以下，Mn：0.5％〜3.0％，P：0.02％以下，S：0.06％以下，Cr：0.3〜3.0％，Mo： 0.005〜0.4％，V：0.02〜0.5％，Nb：0.003〜0.15％，Al：0.005〜0.2％，Sb：0.0005〜0.02％，余量包括Fe和杂质， 贝氏体相与整个微观结构的面积比大于50％。

公开(公告)号：US11332799B2

公开(公告)日：2022-05-17

申请号：US16330857

申请日：2017-09-08

申请人： JFE STEEL CORPORATION

发明人： Keisuke Ando ,  Takashi Iwamoto ,  Kimihiro Nishimura ,  Katsuyuki Ichimiya

IPC分类号： C21D1/06 ,  C21D9/32 ,  C22C38/00 ,  C21D9/00 ,  C21D8/06 ,  C22C38/02 ,  C22C38/04 ,  C22C38/22 ,  C22C38/28 ,  C22C38/32 ,  C22C38/26 ,  C22C38/60 ,  C22C38/44 ,  C22C38/24 ,  C22C38/54 ,  C22C38/50 ,  C22C38/06 ,  C22C38/20

摘要： Disclosed are a case hardened steel which is suitable as a material for producing mechanical structural parts having high rotating bending fatigue strength and impact fatigue strength at a relatively low cost, and a method of producing the same. The case hardening steel has a chemical composition containing, by mass %, C, Si, Mn, P, S, Cr, Mo, B, Ti, N, and O within a range satisfying a predetermined relationship, and Al in at least a predetermined amount in relation to the B, N, and Ti contents, with the balance being Fe and inevitable impurities, wherein √I≤80 is satisfied, where I represents an area in μm2 of an oxide-based inclusion located at the center of a fish-eye on a fracture surface of the case hardening steel after being subjected to carburizing-quenching and tempering and subsequently to a rotating bending fatigue test.

公开(公告)号：US10774534B2

公开(公告)日：2020-09-15

申请号：US16076779

申请日：2017-02-08

申请人： JFE STEEL CORPORATION

发明人： Kiyoshi Uwai ,  Takashi Iwamoto ,  Kazukuni Hase

IPC分类号： E04C5/06 ,  C22C38/60 ,  E04C5/03 ,  C22C38/38 ,  C21D7/10 ,  C21D8/08 ,  C21D6/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/24 ,  C22C38/26 ,  C21D9/00

摘要： A high manganese content deformed reinforcing bar having an austenite single phase microstructure has excellent bending workability. A deformed reinforcing bar includes a chemical composition containing, in mass %, C: 0.7% or more and 1.2% or less, Si: 1.0% or less, Mn: 9% or more and 15% or less, Cr: 1.0% or less, P: 0.03% or less, and S: 0.05% or less, the balance consisting of Fe and inevitable impurities; and a microstructure comprising an austenite single phase. The ratio of the difference between the maximum and minimum hardness at a periphery of a cross-section perpendicular to the longitudinal direction with respect to a central average hardness is 15% or less. Two or more ribs extend in the longitudinal direction at equal intervals in a cross-sectional circumferential direction. The ratio of the difference between the maximum and minimum width of the ribs to the minimum width is 50% or less.

公开(公告)号：US20150020926A1

公开(公告)日：2015-01-22

申请号：US14378553

申请日：2013-02-15

申请人： JFE Bars & Shapes Corporation ,  JFE Steel Corporation

发明人： Takashi Iwamoto ,  Keisuke Ando ,  Kunikazu Tomita ,  Yasuhiro Omori ,  Kiyoshi Uwai ,  Shinji Mitao

IPC分类号： C23C8/32 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/00 ,  C22C38/22 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/38 ,  C22C38/24

CPC分类号： C23C8/32 ,  C21D6/002 ,  C21D2211/002 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/60

摘要： According to the present invention, it is possible to obtain steel for nitrocarburizing having a predetermined chemical composition, a bainite area ratio exceeding 50% and excellent machinability by cutting before nitrocarburizing, and having strength and toughness equivalent to conventional steel, such as SCr420 carburized steel material, and excellent fatigue properties after nitrocarburizing.

摘要翻译： 根据本发明，可以获得具有预定化学组成，贝氏体面积率超过50％的氮碳共渗钢，并且在氮碳共渗之前通过切割获得优异的机械加工性，并且具有与常规钢相同的强度和韧性，例如SCr420渗碳钢 材料，并且在氮碳共渗之后具有优异的疲劳性能。