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1. 发明专利

JP2004027305A Case hardening member for rolling part 审中-公开
公开(公告)号：JP2004027305A
公开(公告)日：2004-01-29
申请号：JP2002186668
申请日：2002-06-26
申请人： Daido Steel Co Ltd , Nissan Motor Co Ltd , 大同特殊鋼株式会社 , 日産自動車株式会社
发明人： KIMURA TOSHIMITSU , OTANI KEIZO , UCHIYAMA NORIKO , YAMAGUCHI TAKUO , KINO NOBUO
IPC分类号： F16H55/06 , C22C38/00 , C22C38/48 , C22C38/54 , F16H15/38
摘要： PROBLEM TO BE SOLVED: To provide a case hardening member for a rolling part with which variation in the rolling fatigue strength of the part can be reduced without promoting the formation of network coarse carbides on the surface of the part in the process of carburizing, or the formation of a film blocking the carburizing can be prevented, and the concentration of the carbon on the surface thereof can be set to an objective value.
SOLUTION: The case hardening member for a rolling part consists of steel having a composition comprising, by mass, 0.15 to 0.40% C, 0 to 1.50% Si, 0 to 4.50% Ni, 0.85 to 3.0% Cr and 0.15 to 2.0% Mo, and in which the condition of Cr+Mo:2.5 to 4.0% or Si+Ni:1.50 to 5.0% is satisfied, and the balance Fe with inevitable impurities, and the content of Nb is controlled to

2. 发明专利

JP2004307932A Steel for bolt having excellent delayed fracture resistance, and method of producing bolt 有权
$Steel for bolt having excellent delayed fracture resistance, and method of producing bolt$
公开(公告)号：JP2004307932A
公开(公告)日：2004-11-04
申请号：JP2003103068
申请日：2003-04-07
申请人： Daido Steel Co Ltd , Nissan Motor Co Ltd , 大同特殊鋼株式会社 , 日産自動車株式会社
发明人： KIMURA TOSHIMITSU , KIMURA KAZUYOSHI , AKIYAMA KOICHI , ITAKURA KOJI
IPC分类号： C21D8/06 , C21D9/00 , C22C38/00 , C22C38/54
摘要： PROBLEM TO BE SOLVED: To provide a steel for a bolt low in cost and capable of obtaining the bolt excellent in delayed fracture resistance even in the case that a bonderized coating film is applied, thereafter a wire drawing and a bolt forming are performed.
SOLUTION: The steel for a bolt has a chemical composition containing, by weight, 0.22 to 0.32% C, ≤0.20% Si, 0.60 to 1.20% Mn, ≤0.015% P, ≤0.005% S, 0.07 to 0.25% Cu, 0.03 to 0.20% Ni, 0.10 to 0.40% Cu+Ni, 0.05 to 0.45% Cr, 0.01 to 0.10% Ti, 0.01 to 0.06% Nb, 0.002 to 0.010% N and 0.0005 to 0.0030% B, and the balance Fe with inevitable impurities.
COPYRIGHT: (C)2005,JPO&NCIPI

3. 发明专利

JP2005068453A High facial pressure resistant part and manufacturing method therefor 审中-公开
标题翻译：高真空耐压部件及其制造方法
公开(公告)号：JP2005068453A
公开(公告)日：2005-03-17
申请号：JP2003209275
申请日：2003-08-28
申请人： Daido Steel Co Ltd , Nissan Motor Co Ltd , 大同特殊鋼株式会社 , 日産自動車株式会社
发明人： OTANI KEIZO , KINO NOBUO , UCHIYAMA NORIKO , YAMAGUCHI TAKUO , KIMURA TOSHIMITSU
IPC分类号： F16H55/06 , C21D1/78 , C21D9/00 , C21D9/32 , C21D9/36 , C21D9/40 , C22C38/00 , C22C38/50 , C23C8/22 , F16C33/32 , F16C33/34 , F16C33/62 , F16H15/38 , F16H55/17
CPC分类号： C22C38/44 , C21D1/78 , C21D9/36 , C22C38/02 , C22C38/04 , C22C38/46 , C22C38/48 , C22C38/50 , C23C8/22
摘要： PROBLEM TO BE SOLVED: To provide high facial pressure resistant parts which miniaturize / reduce the weight of rolling parts such as a toothed gear and bearings, and power transmission parts in a CVT (continuously variable transmission) mechanism, enhance a capacity of transmittable torque and have surface fatigue strength usable under a high bearing pressure, and to provide a manufacturing method therefor.
SOLUTION: The high facial pressure resistant parts are made of a steel material comprising 0.15-0.40% C, 0.50-1.50% Si, 0.20-1.50% Mn, 0.50-1.50% Cr, 0.05-0.50% Mo, one or more elements selected from the group consisting of 0.50-3.50% Ni, 0.03-0.20% Ti, 0.03-0.15% Nb and 0.01-0.10% Al, 0.010% or less P and the balance Fe with unavoidable impurities; and contains 0.8 to 1.2% carbon at the rolling portion on the surface.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：要解决的问题：为了提供在CVT（无级变速器）机构中使齿轮和轴承等的滚动部件和动力传递部件的重量轻小化或减轻的高面部耐压部件，提高并且在高承载压力下具有可使用的表面疲劳强度，并提供其制造方法。
解决方案：高耐面压部件由钢材制成，包括0.15-0.40％C，0.50-1.50％Si，0.20-1.50％Mn，0.50-1.50％Cr，0.05-0.50％Mo，一种或更多的元素选自0.50-3.50％Ni，0.03-0.20％Ti，0.03-0.15％Nb和0.01-0.10％Al，0.010％或更少的P，余量为不可避免的杂质; 并且在表面的滚动部分含有0.8-1.2％的碳。版权所有（C）2005，JPO＆NCIPI

4. 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

5. 发明专利

JP2013007087A Forging steel, forged product and method of manufacturing the same 审中-公开
标题翻译：锻造钢，锻造产品及其制造方法
公开(公告)号：JP2013007087A
公开(公告)日：2013-01-10
申请号：JP2011139942
申请日：2011-06-23
申请人： Daido Steel Co Ltd , 大同特殊鋼株式会社
发明人： KIMURA TOSHIMITSU , ISOGAWA YUKIHIRO , FUJIWARA MASANAO , OKAJIMA TAKUMA , TSUDA MASASHI
IPC分类号： C22C38/00 , B21J5/00 , C21D8/00 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To provide: a forging steel which has both high proof stress and high fatigue strength and has little dispersion of fatigue strength; a forged product manufactured using it; and a manufacturing method thereof.SOLUTION: The forging steel contains 0.2-0.6 mass% C, 0.05-2.0 mass% Si, 0.3-1.1 mass% Mn and 0.04-0.15 mass% S with the balance being Fe and inevitable impurities. In the forged product, a ferrite area ratio is 18% or higher, 0.2% proof stress at room temperature is 700 MPa or higher, and ΔS is 10 MPa or higher. The forged product is obtained by heating the forging steel having the composition at the temperature of Apoint or higher and 1,300°C or lower, hot-forging it at the temperature of Apoint or higher and 1,300°C or lower and at the rolling reduction of 8% or higher, and warm-forging it at the temperature of 200°C or higher and 650°C or lower and at the rolling reduction of 7% or higher and below 50%.
摘要翻译：要解决的问题：提供：具有高抗疲劳强度和高疲劳强度且疲劳强度分散性差的锻钢; 使用它制造的锻造产品; 及其制造方法。解决方案：锻钢含有0.2-0.6质量％的C，0.05-2.0质量％的Si，0.3-1.1质量％的Mn和0.04-0.15质量％的S，余量是Fe和不可避免的杂质。在锻造品中，铁素体面积率为18％以上，室温下的0.2％屈服应力为700MPa以上，ΔS为10MPa以上。通过将组合物的温度为A 3 点以上，1300℃以下，轧制压下率为8％以上，在200℃以上，650℃以上的温锻 ℃以下，轧制压下率为7％以上且低于50％。版权所有（C）2013，JPO＆INPIT

6. 发明专利

JP2004027266A Steel for quenching 审中-公开
公开(公告)号：JP2004027266A
公开(公告)日：2004-01-29
申请号：JP2002183099
申请日：2002-06-24
申请人： Daido Steel Co Ltd , 大同特殊鋼株式会社
发明人： KIMURA TOSHIMITSU , KINAMI TOSHIYA
IPC分类号： C21D8/00 , C21D1/06 , C21D9/46 , C22C38/00 , C22C38/38 , C22C38/58
摘要： PROBLEM TO BE SOLVED: To provide a steel for quenching which is easily workable before quenching, can be subjected to quenching with high precision at a low strain by gas cooling and further has excellent fracture strength and fatigue strength after quenching.
SOLUTION: The steel has a bar-shaped or linear stock form by plastic working. The steel has an Fe content of, by mass, ≥92%, and at least comprises C, Si, Mn and Cr as essential components among C, Si, Mn, Cr and Mo. Provided that the C content is defined as WC (mass%), Si content as WSi (mass%), the Mn content as WMn (mass%), the Cr content as WCr (mass%) and the Mo content as WMo (mass%), WC: 0.1 to 0.8%, WSi: 0.4 to 1.5%, WMn: 0.3 to 1.8%, WCr: 0.5 to 2% and WMo: ≤0.35% are satisfied. Further, the composition of each component is controlled so that, provided that H≡142+122WC-8.8WSi+14.5WMn-25WCr+113WMo; and K≡0.5WSi+WMn+WCr+2WMo, H reaches ≤240, and also, K reaches 1.8 to 4.5.
COPYRIGHT: (C)2004,JPO

7. 发明专利

JP2004027260A Rolling element and method of producing the same 审中-公开
公开(公告)号：JP2004027260A
公开(公告)日：2004-01-29
申请号：JP2002182518
申请日：2002-06-24
申请人： Daido Steel Co Ltd , Ntn Corp , Ntn株式会社 , 大同特殊鋼株式会社
发明人： OKI TSUTOMU , MAEDA KIKUO , KIMURA TOSHIMITSU , KINAMI TOSHIYA
IPC分类号： F16C33/32 , C21D1/06 , C21D6/00 , C21D9/40 , C22C38/00 , C22C38/38 , C23C8/22 , C23C8/26 , F16C33/34 , F16C33/62 , F16C33/64
摘要： PROBLEM TO BE SOLVED: To provide a rolling element of which deformation caused by hardening treatment can be suppressed without remarkably deteriorating characteristics required to be provided as a rolling element such as rolling life fatigue nor reducing production efficiency, and to provide a method of producing the same. SOLUTION: The rolling element consists of a steel member. The steel member has a composition comprising, by mass, 0.1 to 0.8% C, 0.4 to 1.5% Si, 0.3 to 1.8% Mn, 0.5 to 2.0% Cr, 0 to 0.35% Mo, ≤0.050% Al, ≤0.003% Ti, ≤0.0050% O and ≤0.015% N, and in which inequality (1); H COPYRIGHT: (C)2004,JPO

8. 发明专利

JP2006037177A Age hardening steel 有权
标题翻译：老化钢
公开(公告)号：JP2006037177A
公开(公告)日：2006-02-09
申请号：JP2004220223
申请日：2004-07-28
申请人： Daido Steel Co Ltd , 大同特殊鋼株式会社
发明人： HIRAOKA YASUSHI , KATO SHINICHIRO , TAKADA KATSUNORI , KIMURA TOSHIMITSU
IPC分类号： C22C38/00 , C22C38/38 , C22C38/60
摘要： PROBLEM TO BE SOLVED: To provide age-hardening steel whose hardness is made higher than that before aging treatment by ≥7 HRC owing to the aging treatment. SOLUTION: The age-hardening steel has a composition comprising, by mass, 0.11 to 0.60% C, 0.03 to 3.0% Si, 0.01 to 2.5% Mn, 0.3 to 4.0% Mo, 0.05 to 0.5% V and 0.1 to 3.0% Cr, and the balance Fe with inevitable impurities, and in which, among the respective components, the relations satisfying the inequalities of 4C+Mn+0.7Cr+0.6Mo-0.2V≥2.5, C≥Mo/16+V/5.7, and V+0.15Mo≥0.4 are valid. The steel is cooled at the average cooling rate of 0.05 to 10°C/s in the temperature range of 800 to 300°C after rolling, forging or solution treatment, the area ratio of a bainitic structure is ≥50% and its hardness is also ≤40 HRC before aging treatment, and the hardness is made higher than that before aging treatment by ≥7 HRC owing to the aging treatment. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：由于老化处理，提供硬度高于老化处理时间≥7HRC的老化硬化钢。＆lt; P＆gt;解决方案：所述时效硬化钢的组成为：以质量计含有0.11〜0.60％的C，0.03〜3.0％的Si，0.01〜2.5％的Mn，0.3〜4.0％的Mo，0.05〜0.5％的V，0.1〜 3.0％Cr，平衡Fe与不可避免的杂质，其中各组分中满足不等式4C + Mn + 0.7Cr + 0.6Mo-0.2V≥2.5，C≥Mo/ 16 + V / 5.7，V +0.15Mo≥0.4有效。钢在轧制，锻造或固溶处理后，在800〜300℃的温度范围内以0.05〜10℃/ s的平均冷却速度冷却，贝氏体组织的面积比为≥50％，硬度为老化处理前也≤40HRC，由于老化处理，硬度高于老化处理≥7HRC。版权所有（C）2006，JPO＆NCIPI

9. 发明专利

JP2005232570A High fatigue strength bar steel and its production method 审中-公开
标题翻译：高疲劳强度钢及其生产方法
公开(公告)号：JP2005232570A
公开(公告)日：2005-09-02
申请号：JP2004046716
申请日：2004-02-23
申请人： Daido Steel Co Ltd , 大同特殊鋼株式会社
发明人： KIMURA TOSHIMITSU
IPC分类号： B21B1/16 , B21B3/00 , C21D8/06 , C21D9/00 , C22C38/00 , C22C38/04
摘要： PROBLEM TO BE SOLVED: To provide high fatigue strength bar steel having tensile strength of ≥850 MPa only by rolling without performing refining treatment, and to provide its production method.
SOLUTION: The high fatigue strength bar steel comprises, by mass, 0.40 to 0.80% C, 0.81 to 2.60% Si and 0.20 to 2.20% Mn as essential components. The steel structure is substantially composed of a texture of ferritic grains 1 in which cementite is dispersedly precipitated, and also having a grain shape elongating in a rolling direction. The ferritic grains 1 are composed of ferritic subgrains 2 with a mean grain size of ≤3 μm.
COPYRIGHT: (C)2005,JPO&NCIPI
摘要翻译：待解决的问题：仅通过在不进行精炼处理的情况下进行轧制来提供拉伸强度≥850MPa的高疲劳强度的钢筋，并提供其制造方法。解决方案：高疲劳强度钢筋以质量计包含0.40至0.80％的C，0.81至2.60％的Si和0.20至2.20％的Mn作为必要组分。钢结构基本上由铁素体晶粒1的组织构成，其中渗碳体分散沉淀，并且还具有在轧制方向上延伸的晶粒形状。铁素体晶粒1由平均粒径≤3μm的铁素体亚晶粒2构成。版权所有（C）2005，JPO＆NCIPI

10. 发明专利

JP2003105496A SPRING STEEL HAVING LOW DECARBURIZATION AND EXCELLENT DELAYED FRACTURE RESISTANCE 审中-公开
公开(公告)号：JP2003105496A
公开(公告)日：2003-04-09
申请号：JP2001294570
申请日：2001-09-26
申请人： DAIDO STEEL CO LTD
发明人： KIMURA KAZUYOSHI , KIMURA TOSHIMITSU
IPC分类号： F16F1/02 , C22C38/00 , C22C38/60 , H04J14/00 , H04J14/02 , H04Q3/52
摘要： PROBLEM TO BE SOLVED: To produce high strength spring steel which has low ferrite decarburization and excellent delayed fracture resistance. SOLUTION: This spring steel has a composition containing, by weight, 0.38 to 0.48% C, 1.8 to 2.8% Si, 0.2 to 0.9% Mn,

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