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1. 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,

2. 发明专利

JP2005154784A Bearing steel excellent in corrosion resistance 有权
标题翻译：轴承钢在耐腐蚀性方面优秀
公开(公告)号：JP2005154784A
公开(公告)日：2005-06-16
申请号：JP2003382604
申请日：2003-11-12
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： KINAMI TOSHIYA , KIMURA TOSHIMITSU , NISHISAKA HISATO , GOTO MASAO
IPC分类号： C22C38/00 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To provide bearing steel which is excellent in corrosion resistance, and rolling fatigue life even when adapted for bearings etc., of rolling mills.
SOLUTION: The bearing steel has a composition containing, by weight %, 0.10 to 0.3 C, ≤0.5 Si, 0.2 to 1.5 of Mn, ≤0.03 P, ≤0.03 S, 1.0 to 3.5 Ni, 1.0 to 5.0 Cr, 0.03 to 2.5 Mo, 0.005 to 0.050 Al, ≤0.003 Ti, ≤0.0015 O, ≤0.025 N, and substantially the balance Fe, wherein after carburizing or carbonitriding treatment, a surface C concentration is ≥0.7%, the content of the carbide is ≤15% by area and the content of the rod-like carbide 10 having an aspect ratio expressed by the ratio of major diameter to minor diameter of ≥3 and having a minor diameter of ≥2 μm is ≤0.1%.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：提供耐磨性优异的轴承钢，以及即使在适用于轴承等的轧机中的滚动疲劳寿命。解决方案：轴承钢具有以重量％计含有0.10〜0.3C，≤0.5Si，0.2〜1.5的Mn，≤0.03P，≤0.03S，1.0〜3.5Ni，1.0〜5.0Cr， 0.03〜2.5Mo，0.005〜0.050％Al，≤0.003Ti，≤0.0015O，≤0.025N，实质上为Fe，其中，渗碳或碳氮共渗处理后，表面C浓度≥0.7％，碳化物含量为 ≤15％的面积，由长径比小于3的长径比≥3μm而长径比≥2μm的棒状碳化物10的含量≤0.1％。版权所有（C）2005，JPO＆NCIPI

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

JP2002102927A ROLL FOR STRAIGHTENING MACHINE FOR ROLLED STEEL PLATE 失效
公开(公告)号：JP2002102927A
公开(公告)日：2002-04-09
申请号：JP2000291191
申请日：2000-09-25
申请人： KOYO SEIKO CO , DAIDO STEEL CO LTD
发明人： GOTO MASAO , MATSUDA SHINYA , SHIMIZU TETSUYA , KIKUCHI SHIGEO , OKABE MICHIO
IPC分类号： B21D1/05 , C21D9/38 , C22C38/00 , C22C38/50
摘要： PROBLEM TO BE SOLVED: To provide a roll for a straightening machine for a rolled steel plate excellent in corrosion resistance, and wear and abrasion resistance, having a stable surface hardness. SOLUTION: The roll 1 for the straightening machine for the rolled steel plate is composed of Fe as a major constituent, C as 0.4-0.6% in weight percent, Cr as 11-15%, Mo as 0.5-1.5%, and at the same time, Si and Mn contents as 0.5% or less respectively, and Cu and Ni as 1.0% or less respectively, P as 0.04% or less, S as 0.03% or less, N as 0.05% or less, O as 0.02% or less, and one or two kinds or more chemical elements selected from Nb, V, Ti, Zr, Hf and Ta are composed of Fe system materials as total 0.1-0.5% in weight percent.

5. 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.

6. 发明专利

JP2002220638A BEARING MATERIAL 失效
公开(公告)号：JP2002220638A
公开(公告)日：2002-08-09
申请号：JP2001018884
申请日：2001-01-26
申请人： KAWASAKI STEEL CO , KOYO SEIKO CO
发明人： MATSUZAKI AKIHIRO , IWAMOTO TAKASHI , YAMAZAKI YOSHIO , KIZAWA KATSUHIKO , GOTO MASAO
IPC分类号： C22C38/00 , C21D9/40 , C22C38/02 , C22C38/04 , C22C38/18 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To provide a long life bearing material for general use without being restricted by a smelting process and without increasing the manufacturing cost. SOLUTION: This bearing material comprises a composition containing 0.95-1.10 mass% C, 0.15-0.70 mass% Si, 1.15 mass% or less Mn, 0.90-1.60 mass% Cr, and 0.025 mass% or less P, and 0.025 mass% or less S and 0.0012 mass% or less O, both of which are non-metallic inclusion forming elements, and the balance Fe and unavoidable impurities; making maximum diameter of oxide based non-metallic inclusions as more than 10 μm and 15 μm or less when the detected area is 320 mm2, and the number of the oxide-based non-metallic inclusions with an equivalent circle diameter of 3 μm or more, as 250 or less when the detected area is 320 mm2; and satisfying at least either of a condition that AlN in the material is 0.020 mass% or less, or a condition that the number of sulfide-based non-metallic inclusions with the thickness of 1 μm or more, in the detected area of 320 mm2 in the material, is 1200 or less.

7. 发明专利

JP2000310307A TOROIDAL TYPE CONTINUOUSLY VARIABLE TRANSMISSION 失效
公开(公告)号：JP2000310307A
公开(公告)日：2000-11-07
申请号：JP11793299
申请日：1999-04-26
申请人： KOYO SEIKO CO
发明人： ONO YOSHIHIRO , YASUHARA SHINJI , GOTO MASAO
IPC分类号： F16H15/38 , C22C38/00 , C22C38/38
摘要： PROBLEM TO BE SOLVED: To provide a toroidal type continuously variable transmission of excellent heat resistance and long service life. SOLUTION: In this toroidal type continuously variable transmission, 0.8-1.5 wt.% of C, 0.5-2.0 wt.% of Si, 0.3-2.0 wt.% of Mn, 1.3-1.98 wt.% of Cr, 0.3-1.0 wt.% of Mo and more than or equal to 1.0 wt.% of (Si+Mo) are contained in heat resistant bearing steel which disks 2, 3 and rollers 12, 13 are made of. This toroidal type continuously variable transmission, thereby, has an excellent heat resistance and long service life while maintaining low cost comparing to a toroidal type continuously variable transmission made of high carbon bearing steel (SUJ2).

8. 发明专利

JPH0313585A METHOD FOR SURFACE-HARDENING METAL AND METHOD FOR SURFACE-HARDENING NONMAGNETIC BEARING PARTS 失效
公开(公告)号：JPH0313585A
公开(公告)日：1991-01-22
申请号：JP14892689
申请日：1989-06-12
申请人： KOYO SEIKO CO
发明人： GOTO MASAO
IPC分类号： F16C33/62 , C23C24/10 , C23C26/00
摘要： PURPOSE:To efficiently form a sufficiently thick alloy carbide layer on the surface of a metal to harden the surface at a low cost by arranging a mixture of metal powder and carbon powder on the surface of a metallic substrate and irradiating the mixture with a high-density energy beam. CONSTITUTION:A mixture of the powder 2 of a metal such as chromium and carbon powder 3 is arranged on the surface of a metallic substrate 1 of mild steel, etc. The mixture is irradiated with a laser beam, an electron beam, etc., as the high-density energy beam. Consequently, the metal powder 2 and carbon powder 3 are melted, and the surface of the substrate 1 is also melted. An alloy carbide layer 4 is formed on the surface of the substrate 1 in this way, and the carbon atom of the powder 3 is diffused and infiltrated into the substrate 1. The surface of the substrate 1 is hardened with the sufficiently thick alloy carbide layer 4. Nonmagnetic metal powder and carbon powder are arranged on the surface of a nonmagnetic bearing part, and irradiated with a high density energy beam by this method to improve the surface hardness and rolling characteristic or the part.

9. 发明专利

JP2004143536A Method for manufacturing rolling slide member 有权
公开(公告)号：JP2004143536A
公开(公告)日：2004-05-20
申请号：JP2002309988
申请日：2002-10-24
申请人： Koyo Seiko Co Ltd , 光洋精工株式会社
发明人： TODA KAZUHISA , GOTO MASAO , HARADA HISASHI
IPC分类号： F16C33/64 , B21J5/00 , B21K1/05 , C21D9/40
摘要： PROBLEM TO BE SOLVED: To provide a method for manufacturing a rolling slide member capable of realizing good manufacturing efficiency and of suppressing a manufacturing cost while assuring machinability having no problems for practicable use.
SOLUTION: An intermediate blank is first fabricated by hot forging a blank consisting of high carbon steel. The intermediate blank subjected to a normalizing treatment, having a metallic structure of a substantially pearlite single phase set to ≤1.5 μm in the maximum thickness of cementite existing between pearlite particles is manufactured by subjecting the hot forged intermediate blank to the normalizing treatment. The intermediate blank subjected to the normalizing treatment is subjected to turning treatment and further to hardening and tempering, finishing treatment, etc.
COPYRIGHT: (C)2004,JPO

10. 发明专利

JP2004143533A Bearing component 有权
标题翻译：轴承组件
公开(公告)号：JP2004143533A
公开(公告)日：2004-05-20
申请号：JP2002309805
申请日：2002-10-24
申请人： Koyo Seiko Co Ltd , 光洋精工株式会社
发明人： MOMOJI HIROBUMI , GOTO MASAO
IPC分类号： F16C33/32 , C22C38/00 , C22C38/18 , F16C33/34 , F16C33/62
CPC分类号： C22C38/02 , C22C38/001 , C22C38/18 , F16C33/121
摘要： PROBLEM TO BE SOLVED: To provide a bearing component which has high damping capacity at a low production cost.
SOLUTION: The bearing component consists of high damping steel comprising, by weight, 0.2 to 0.6% C, 5.0 to 15.0% Cr, 0.2 to 1.3% Si and 0.05 to 0.20% N, and the balance Fe with inevitable impurities. The steel is subjected to normal quenching treatment to control its surface hardness to ≥57 by Rockwell C hardness.
COPYRIGHT: (C)2004,JPO

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