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1. 发明专利

JP2002012919A BEARING PARTS 失效
公开(公告)号：JP2002012919A
公开(公告)日：2002-01-15
申请号：JP2001156420
申请日：2001-05-25
申请人： KOYO SEIKO CO , DAIDO STEEL CO LTD
发明人： GOTO MASAO , OTA ATSUHIKO
IPC分类号： F16C33/32 , C21D1/32 , C21D9/40 , C22C38/00 , C22C38/24 , F16C33/44 , F16C33/62
摘要： PROBLEM TO BE SOLVED: To provide an inexpensive bearing part improved in cold workability and extended in rolling fatigue limit. SOLUTION: This bearing part is formed of a steel comprising, by weight, 0.6-0.8% C, 0.05-0.25% Si, 0.2-0.9% Mn, 0.4-1.2% Cr, one or two kinds of 0.10-0.30% Mo and 0.03-0.10% V, and the balance Fe with inevitable impurities. The steel has the largest carbide particle diameter of less than 1.5 μm after the treatments of spheroidizing annealing including the furnace cooling at the cooling rate of 10 deg.C/hr, quenching and tempering, and also the carbide amount of 2-7% in terms of area rate.

2. 发明专利

JPH1161338A STEEL FOR BALL AND ROLLER BEARING 失效
公开(公告)号：JPH1161338A
公开(公告)日：1999-03-05
申请号：JP22822697
申请日：1997-08-25
申请人： DAIDO STEEL CO LTD , KOYO SEIKO CO
发明人： KIMURA TOSHIMITSU , OTA ATSUHIKO , HATTORI KIYOYUKI
IPC分类号： C22C38/00 , C22C38/22
摘要： PROBLEM TO BE SOLVED: To provide steel for ball and roller bearings having excellent rotary bending fatigue property and rolling fatigue property without bringing about a remarkable cost increase. SOLUTION: The content of alloy elements is, by mass-%, 0.75-0.90% C, 0.04-0.15% Si, 0.15-0.35% Mn, 1.00-1.40% Cr, 0.01-0.20% Mo and

3. 发明专利

JPH07188857A BEARING PARTS 失效
公开(公告)号：JPH07188857A
公开(公告)日：1995-07-25
申请号：JP33062493
申请日：1993-12-27
申请人： KOYO SEIKO CO , DAIDO STEEL CO LTD
发明人： GOTO MASAO , OTA ATSUHIKO
IPC分类号： C22C38/00 , C22C38/22 , C22C38/24 , F16C33/30
摘要： PURPOSE:To produce bearing parts having long rolling fatigue life by preparing bearing parts by using a low alloy steel of specific composition and also specifying the amount and grain size of metal carbides in a structure after heat treatment, respectively. CONSTITUTION:A low alloy steel, having a composition containing, by weight, 0.6-0.8% C, 0.05-0.025% Si, 0.2-0.9% Mn, 0.4-1.2% Cr, and further 0.10-0.30% Mo and/or 0.03-0.10% V, is used. A steel bar, prepared by using the low alloy steel as a stock, is subjected to spheroidizing annealing and then worked into an annular shape by cold forging, which is further turned and formed into bearing parts of a prescribed shape. The bearing parts are heated, e.g. at 850 deg.C for 30-40min and cooled rapidly to undergo hardening treatment and then heated at 160-180 deg.C for 1-2hr to undergo tempering. The grain size of metal carbides in the structure is regulated to

4. 发明专利

JPH0853735A STEEL FOR BEARING 失效
公开(公告)号：JPH0853735A
公开(公告)日：1996-02-27
申请号：JP18956994
申请日：1994-08-11
申请人： DAIDO STEEL CO LTD , KOYO SEIKO CO
发明人： KUREBAYASHI YUTAKA , NAKAMURA SADAYUKI , GOTO MASAO , OTA ATSUHIKO
IPC分类号： C22C38/00 , C22C38/22 , C22C38/54
摘要： PURPOSE:To produce a steel for bearing by which the simplification of a heat treating stage is attained while the formation of large carbides harmful to its rolling service life is suppressed and the rolling service life can moreover be improved while its good cold workability, machinability and hardenability are maintained. CONSTITUTION:A steel having a compsn. contg., as allay elements, by mass, 0.55 to 0.75% C,

5. 发明专利

JP2004225102A High strength steel for pinion shaft, and production method therefor 有权
公开(公告)号：JP2004225102A
公开(公告)日：2004-08-12
申请号：JP2003014208
申请日：2003-01-23
申请人： Daido Steel Co Ltd , Koyo Seiko Co Ltd , 光洋精工株式会社 , 大同特殊鋼株式会社
发明人： TAKADA KATSUNORI , INOUE KOICHIRO , GOTO KATSUSHI , OTA ATSUHIKO , TAKEI SATOYUKI
IPC分类号： C21D8/00 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/12 , C22C38/14 , C22C38/18 , C22C38/20 , C22C38/22 , C22C38/28 , C22C38/32 , C22C38/40 , C22C38/42 , C22C38/44 , C22C38/48 , C22C38/50 , C22C38/54
CPC分类号： C22C38/02 , B62D3/12 , C21D1/10 , C21D7/13 , C21D9/32 , C21D2211/002 , C21D2211/005 , C21D2211/009 , C22C38/04 , C22C38/12 , C22C38/14 , C22C38/18 , Y02P10/253
摘要： PROBLEM TO BE SOLVED: To provide non-heat treated high strength steel for a pinion shaft subjected to induction hardening so as to be used which hardly causes the generation of plucking on hob working, has high surface hardness, impact value and twisting strength after induction hardening, and has reduced heat treatment strain on induction hardening, and to provide a production method therefor. SOLUTION: The high strength steel for a pinion shaft has a composition comprising, by mass, 0.45 to 0.55% C, 0.10 to 0.50% Si, 0.50 to 1.20% Mn, ≤0.025% P, ≤0.025% S, 0.15 to 0.25% Mo, 0.0005 to 0.005% B, 0.005 to 0.10% Ti and ≤0.015% N, and also satisfying 0.80≤Ceq≤0.95 and f value≤1.0, and the balance Fe with inevitable impurities. COPYRIGHT: (C)2004,JPO&NCIPI

6. 发明专利

JP2004353005A Steel bar for steering rack 有权
标题翻译：用于转向架的钢条
公开(公告)号：JP2004353005A
公开(公告)日：2004-12-16
申请号：JP2003148906
申请日：2003-05-27
申请人： Kobe Steel Ltd , Koyo Seiko Co Ltd , 光洋精工株式会社 , 株式会社神戸製鋼所
发明人： OTA ATSUHIKO , KAMEI AKIRA , IKEDA SHOICHI , ANAMI GORO , IDOJIRI HIROSHI
IPC分类号： B62D3/12 , C21D9/32 , C22C38/00 , C22C38/14 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To provide a steel bar for a steering rack, which has superior impact resistance in addition to improved abrasion resistance, and prevents propagation/penetration of cracks.
SOLUTION: The steel bar for the steering rack includes 0.50-0.60% C, 0.05-0.5% Si, 0.2-1.5% Mn, 0.0005-0.003% B, 0.005-0.05% Ti, 0.0005-0.1% Al, 0.002-0.02% N and 1.5% or less Cr. Besides, the quenched/tempered structure of a D/4 part is adjusted so as to satisfy the following conditions (1) to (3). (1) The total of a tempered bainite structure and a tempered martensite structure occupies 30-100% (by area percentage). (2) A reproduced pearlite structure occupies 0-50% (by area percentage). (3) The total of the tempered bainite structure, the tempered martensite structure and the reproduced pearlite structure occupies 50-100% (by area percentage).
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供一种用于转向齿条的钢筋，除了改善耐磨性之外，还具有优异的抗冲击性，并且防止裂纹的传播/渗透。
解决方案：转向架的钢筋包括0.50-0.60％C，0.05-0.5％Si，0.2-1.5％Mn，0.0005-0.003％B，0.005-0.05％Ti，0.0005-0.1％Al，0.002 -0.02％N和1.5％以下Cr。此外，调整D / 4部分的淬火/回火结构以满足以下条件（1）至（3）。（1）回火贝氏体组织和回火马氏体组合的总和占30-100％（按面积百分比）。（2）再现的珠光体结构占0-50％（面积百分比）。（3）回火贝氏体组织，回火马氏体组织和再生珠光体组织的总量占面积百分比的50-100％。版权所有（C）2005，JPO＆NCIPI

7. 发明专利

JPH09291340A BEARING MATERIAL 失效
公开(公告)号：JPH09291340A
公开(公告)日：1997-11-11
申请号：JP3347197
申请日：1997-02-18
申请人： KAWASAKI STEEL CO , KOYO SEIKO CO
发明人： YASUMOTO SATOSHI , HOSHINO TOSHIYUKI , AMANO KENICHI , OTA ATSUHIKO , HAMANOUE MICHIROU
IPC分类号： C22C38/00 , C21D9/36 , C21D9/40 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/18 , C22C38/22 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To produce a bearing material having a rolling service life longer than that in the conventional one. SOLUTION: This bearing material has a componental compsn. contg., by mass, 0.95 to 1.10% C, 0.15 to 0.70% Si, =1μm thickness are contained by area to be examined.

8. 发明专利

JPH05179404A HEAT RESISTANT BEARING STEEL 失效
公开(公告)号：JPH05179404A
公开(公告)日：1993-07-20
申请号：JP35862691
申请日：1991-12-27
申请人： AICHI STEEL WORKS LTD , KOYO SEIKO CO
发明人： NISHIKAWA TOMOAKI , MUROGA HIROSHI , OTA ATSUHIKO , SHIBATA MASAMICHI
IPC分类号： C22C38/00 , C22C38/18
摘要： PURPOSE:To provide a heat resistant bearing steel having superior rolling fatigue life in a wide temp. range between ordinary temp. and high temp. CONSTITUTION:The steel has a composition containing, as essential components, 0.80-1.50% C, 0.15-0.60% Si, 0.15-1.00% Mn, 1.50-2.50% Cr, and 2.50-4.50% Mo and having the balance Fe with inevitable impurities. Besides the above, either or both of 0.05-0.50% Ni and 0.05-0.80% V can be contained. This steel has alloy content lower than that of conventional heat resistant bearing steel AISI-M 50 and carbon content is increased instead. As a result, rolling fatigue life at high temp. (250 deg.C) becomes practically equal to that of the M50 steel in spite of low cost. Further, because of superior carbide distribution, rolling fatigue life at ordinary temp. can be regulated to a value equal to or higher than that of conventional SUJ2 steel.

9. 发明专利

JP2003166036A STEERING RACK STEEL AND MANUFACTURING METHOD THEREFOR 审中-公开
公开(公告)号：JP2003166036A
公开(公告)日：2003-06-13
申请号：JP2001363051
申请日：2001-11-28
申请人： KOYO SEIKO CO , KOBE STEEL LTD
发明人： OTA ATSUHIKO , KAMEI AKIRA , IDOJIRI HIROSHI , ANAMI GORO
IPC分类号： F16H55/06 , C21D9/32 , C22C38/00 , C22C38/38 , F16H55/26
摘要： PROBLEM TO BE SOLVED: To manufacture a steering rack steel superior in bendability at a low cost. SOLUTION: A raw steel for the steering rack steel includes 0.40-0.60% C, 0.05-0.50% Si, 0.05-1.50% Mn, 0.004-0.100% S, further 1.5% or less Cr, 0.0005-0.10% Al, 0.002-0.020% N, as other elements, and the balance Fe with unavoidable impurities. The method for manufacturing the steering rack steel comprises rolling the above raw steel, heating the obtained steel bar at 820°C or higher, cooling it in a controlled condition, and tempering it at 680°C or higher in a short period of 20 minutes or less, to make the part of D/4 deep (D indicates a diameter of the steel bar) from the surface of the bar, to be a tempered bainitic structure and a tempered martensite structure occupying 20-100% (area percentage), and be a reproduced perlite structure occupying 0-50% (area percentage), by total area. COPYRIGHT: (C)2003,JPO

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