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公开(公告)号：US20210381088A1
公开(公告)日：2021-12-09
申请号：US17286876
申请日：2019-10-28
发明人： Masayuki KASAI , Naoya IHARA , Kimihiro NISHIMURA
IPC分类号： C22C38/60 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/42 , C22C38/54 , C22C38/00 , C22C38/06 , C22C38/52 , C23C12/00 , C21D9/00 , C21D8/00 , C21D7/13
摘要： Provided is a steel for nitrocarburizing that ensures mechanical workability before nitrocarburizing treatment. A steel for nitrocarburizing comprises: a chemical composition containing, in mass %, C: ≥0.02% and 0.020% and ≤1.0%, Ti: >0.0050% and ≤0.015%, N: ≤0.0200%, Sb: 0.0030-0.010%, with a balance being Fe and inevitable impurities, satisfying Expression (1) or (2); and a steel microstructure where an area ratio of bainite phase is >50%, a prior austenite grain size is ≤100 μm, ≥300/μm2 Ti precipitates with an equivalent circular particle size of ≤30 nm disperse, Sb segregates to prior austenite grain boundaries.
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2.发明申请公开(公告)号：US20190352762A1
公开(公告)日：2019-11-21
申请号：US16305519
申请日：2017-05-31
IPC分类号： C23C8/22 , C21D9/32 , C21D1/06 , C21D8/06 , C21D9/52 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/06 , 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).
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3.发明申请公开(公告)号：US20190218633A1
公开(公告)日：2019-07-18
申请号：US16330857
申请日：2017-09-08
IPC分类号： C21D1/06 , C21D8/06 , C22C38/22 , C22C38/28 , C22C38/32 , C22C38/06 , C22C38/02 , C22C38/04 , C22C38/00
CPC分类号： C21D1/06 , C21D8/06 , C21D8/065 , C21D9/32 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/60
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.
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公开(公告)号：US20230029298A1
公开(公告)日：2023-01-26
申请号：US17757601
申请日：2020-12-23
摘要： Free-cutting steel includes a specific composition, with an A value defined by a following formula (1) satisfying 4.0 or more and 20.0 or less, and remainder having Fe and an unavoidable impurity; and texture with 1000 or more sulfide particles with an equivalent circle diameter of less than 1 μm per mm2, 500 or more sulfide particles with an equivalent circle diameter of 1 μm or more and 5 μm or less per mm2, and 1000 or more Pb particles with an equivalent circle diameter of 1 μm or less per mm2, wherein A value=(Mn+5Cr)/S (1) here, symbols of elements in the formula indicate contents (% by mass) of the elements.
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公开(公告)号：US20200248291A1
公开(公告)日：2020-08-06
申请号：US16488687
申请日：2018-02-27
IPC分类号： C22C38/60 , B23B5/08 , C22C38/18 , C22C38/16 , C22C38/14 , C22C38/12 , C22C38/08 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00
摘要： Provided is a wire rod that has superior machinability by cutting regardless of the type of tool material and the type of lubricant and even in the case where no lubricant is used. A wire rod for cutting work comprises: a specific chemical composition; and Vickers hardness that satisfies the following expressions (1) and (2) in the case where an average aspect ratio of ferrite grains at a position of 1/4 of a diameter from a surface of the wire rod for cutting work is more than 2.8, and satisfies the following expressions (3) and (4) in the case where the average aspect ratio is 2.8 or less, Have≤350 (1) Hσ≤30 (2) Have≤250 (3) Hσ≤20 (4).
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公开(公告)号：US20200149148A1
公开(公告)日：2020-05-14
申请号：US16464374
申请日：2017-11-30
IPC分类号： C23C8/32 , C22C38/06 , C21D1/06 , C22C38/00 , C22C38/12 , C22C38/04 , C22C38/10 , C22C38/60 , C22C38/08 , C22C38/16 , C22C38/14 , C22C38/32 , C22C38/02
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%.
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