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公开(公告)号：US20240167116A1
公开(公告)日：2024-05-23
申请号：US18551541
申请日：2022-03-22
发明人： Yosuke MATSUMOTO , Kenshi IKEDA , Takuya KOCHI , Masayuki SAKATA , Tatsunori UCHIDA , Koji YAMASHITA , Yuta INOUE
IPC分类号： C21D9/52 , C21D1/18 , C21D1/32 , C21D6/00 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22
CPC分类号： C21D9/525 , C21D1/18 , C21D1/32 , C21D6/002 , C21D6/005 , C21D6/008 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22
摘要： A steel wire for machine structural parts, may include Fe, inevitable impurities, and, by mass: 0.05 to 0.60% C; 0.005 to 0.50% Si; 0.30 to 1.20% Mn; more than 0 to 0.050% P; more than 0 to 0.050% S; 0.001 to 0.10% Al; more than 0 to 1.5% Cr; and more than 0 to 0.02% N. An area of cementite present at ferrite grain boundaries in an area of all cementite of the steel wire may be 32% or more. When a C content (% by mass) of a steel is expressed as [C], an average circular-equivalent diameter of all the cementite is (1.668-2.13 [C]) μm or more and (1.863-2.13 [C]) μm or less.
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公开(公告)号：US20180251876A1
公开(公告)日：2018-09-06
申请号：US15754364
申请日：2016-08-12
发明人： Yuki SASAKI , Takuya KOCHI , Masamichi CHIBA , Masayuki SAKATA , Shogo MURAKAMI
CPC分类号： C22C38/60 , C21D1/18 , C21D1/32 , C21D8/06 , C21D8/065 , C21D2211/005 , C21D2211/009 , C21D2261/00 , C22C38/00 , C22C38/001 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/14
摘要： Disclosed herein is a mechanical structure steel for cold-working that includes C, Si, Mn, P, S, Al, and N and has a metal microstructure including proeutectoid ferrite and pearlite, in which a total area ratio of the proeutectoid ferrite and the pearlite with respect to the entire microstructure is 90% or more, while an area ratio Af of the proeutectoid ferrite with respect to the entire microstructure satisfies a relationship of Af≥A where an A value is represented by formula (1) below, an average circle equivalent diameter of a bcc-Fe crystal grain is in a range of 15 to 30 μm, and a pearlite lamellar spacing is 0.20 μm or less on average: A=(103−128×[C(%)])×0.80(%) (1) where [C (%)] in the formula (1) indicates the C content in percent by mass.
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公开(公告)号：US20180105894A1
公开(公告)日：2018-04-19
申请号：US15562631
申请日：2016-03-16
发明人： Yuki SASAKI , Takuya KOCHI , Masamichi CHIBA , Masayuki SAKATA
IPC分类号： C21D9/52 , C22C38/40 , C22C38/32 , C22C38/20 , C22C38/12 , C22C38/08 , C22C38/18 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D1/32 , C21D8/06 , C21D6/00
CPC分类号： C21D9/525 , C21D1/32 , C21D6/002 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/06 , C21D8/065 , C21D2211/003 , C21D2211/005 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/18 , C22C38/20 , C22C38/32 , C22C38/40 , C22C38/60
摘要： An object of the present invention is to provide a steel wire for mechanical structural parts that is reduced in deformation resistance and improved in crack resistance during cold working, and thus exhibits excellent cold workability. The steel wire for mechanical structural parts of the present invention is a steel wire containing, in mass %, 0.3 to 0.6% of C, (105 to 0.5% of Si, 0.2 to 1.7% of Mn, more than 0% and 0.03% or less of P, 0.001 to 0.05% of S, 0.005 to 0.1% of Al, and 0 to 0.015% of N, the balance being iron and inevitable impurities, wherein steel of the steel wire has a metal structure formed of ferrite and cementite, and the number proportion of cementite particles present in ferrite grain boundaries is 40% or more based on the total number of cementite particles.
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公开(公告)号：US20170130295A1
公开(公告)日：2017-05-11
申请号：US15319115
申请日：2015-06-08
发明人： Yuki SASAKI , Takehiro TSUCHIDA , Takuya KOCHI , Koji YAMASHITA , Masamichi CHIBA , Kei MASUMOTO , Masayuki SAKATA
IPC分类号： C21D9/52 , C21D8/06 , C21D6/00 , C22C38/20 , C22C38/00 , C22C38/08 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , B21B1/22 , C22C38/16
CPC分类号： C21D9/525 , B21B1/22 , B21B2001/225 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/06 , C21D8/065 , C21D2211/005 , C21D2211/009 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/16 , C22C38/18 , C22C38/20
摘要： Provided is a steel for a mechanical structure for cold working, which contains C, Si, Mn, P, S, Al and N and in which the metal structure includes pearlite and ferrite, the total areal proportion of pearlite and ferrite relative to the overall structure is 90% or higher, the average circle-equivalent diameter of bcc-Fe crystal grains surrounded by large angle grain boundaries is 5-15 μm, the average aspect ratio of pro-eutectoid ferrite crystal grains is 3.0 or lower, and the average spacing at the narrowest pearlite lamellar spacing is 0.20 μm or less.
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公开(公告)号：US20240175112A1
公开(公告)日：2024-05-30
申请号：US18552755
申请日：2022-03-22
发明人： Yosuke MATSUMOTO , Kenshi IKEDA , Takuya KOCHI , Masayuki SAKATA , Tatsunori UCHIDA , Koji YAMASHITA , Yuta INOUE
CPC分类号： C22C38/18 , C21D1/32 , C21D8/065 , C21D9/525 , C22C38/02 , C22C38/04 , C22C38/06 , C21D2211/003 , C21D2211/005
摘要： A steel wire for machine structural parts, including respective predetermined contents of C, Si, Mn, P, S, Al, Cr, N, and iron, wherein when a total content of Cr and Mn (% by mass) in cementite in the metallurgical microstructure is expressed as {Cr+Mn}, a total content of Cr and Mn (% by mass) in steel is expressed as [Cr+Mn], and a C content (% by mass) of the steel is expressed as [C], a concentration ratio {Cr+Mn}/[Cr+Mn] is (0.5[C] +0.040) or more, and an average circular-equivalent diameter of all the cementite is (1.668-2.13[C]) μm or more and (1.863-2.13[C]) μm or less.
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公开(公告)号：US20240150861A1
公开(公告)日：2024-05-09
申请号：US18546718
申请日：2022-02-02
发明人： Koji YAMASHITA , Yuta INOUE , Masayuki SAKATA , Takuya KOCHI , Yosuke MATSUMOTO , Tatsunori UCHIDA
IPC分类号： C21D8/00 , C21D1/18 , C21D1/32 , C21D6/00 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44
CPC分类号： C21D8/005 , C21D1/18 , C21D1/32 , C21D6/004 , C21D6/005 , C21D6/008 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C21D2211/002 , C21D2211/005 , C21D2211/008 , C21D2211/009
摘要： A cold-workable mechanical structural steel may include: C: 0.30 to 0.45 mass %; Si: 0.10 to 0.40 mass %; Mn: 0.50 to 1.00 mass %; P: 0.050 mass % or less; S: 0.050 mass % or less; Cr: 0.80 to 1.30 mass %; Al: 0.01 to 0.10 mass %; and a balance of iron and inevitable impurity, the steel having an area percentage of pro-eutectoid ferrite of 10% or larger and 70% or smaller; containing at least one selected from the group consisting of bainite, martensite, and pearlite; and having a dislocation density of 3.5×1014 m−2 or larger.
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公开(公告)号：US20220106670A1
公开(公告)日：2022-04-07
申请号：US17426412
申请日：2020-01-14
IPC分类号： C22C38/22 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/42 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/06 , C21D8/06
摘要： Disclosed is a mechanical structure steel for cold-working, including: C: 0.32 to 0.44% by mass, Si: 0.15 to 0.35% by mass, Mn: 0.55 to 0.95% by mass, P: 0.030% by mass or less, S: 0.030% by mass or less, Cr: 0.85 to 1.25% by mass, Mo: 0.15 to 0.35% by mass, and Al: 0.01 to 0.1% by mass, with the balance consisting of iron and inevitable impurities, wherein an area ratio of proeutectoid ferrite is 30% or more and 70% or less, and an average grain size of ferrite crystal grains is 5 to 15 μm.
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