首页> 外国专利> CASE HARDENING BEARING STEEL HAVING EXCELLENT TOUGHNESS AND ROLLING FATIGUE LIFE IN QUASI-HIGH TEMPERATURE REGION

CASE HARDENING BEARING STEEL HAVING EXCELLENT TOUGHNESS AND ROLLING FATIGUE LIFE IN QUASI-HIGH TEMPERATURE REGION

机译：准高温区的案例强化轴承钢具有出色的韧性和滚动疲劳寿命

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摘要

PROBLEM TO BE SOLVED: To provide case hardening bearing steel which has an excellent rolling fatigue life in a quasi-high temperature region and has an excellent toughness at an ordinary temperature as well.;SOLUTION: The case hardening bearing steel has a composition containing, by mass, 0.15 to 0.30% C, 0.5 to 2.0% Si, 0.3 to 2.0% Mn, 1.3 to 2.5% Cr, 0.3 to 1.0% Mo and ≤0.0012% O in the range satisfying (Si+Mo)≥1.0%, and the balance iron with inevitable impurities. Further, the maximum diameter of oxide based nonmetallic inclusions is controlled to ≤12.5 μm when the area to be inspected is 320 mm², and also, the number of oxide based nonmetallic inclusions having a diameter of the equivalent circle of ≥3 μm is controlled to ≤250 pieces when the area to be inspected is 320 mm². Further, the concentration of C in the surface layer part is controlled to the range of 0.7 to 1.2% by carburizing treatment.;COPYRIGHT: (C)2004,JPO

机译：要解决的问题：提供一种渗碳轴承钢，其在准高温区域具有优异的滚动疲劳寿命，并且在常温下也具有优异的韧性。;解决方案：渗碳轴承钢的成分包括：在满足（Si + Mo）＆ge; 1.0的范围内，0.15至0.30％C，0.5至2.0％Si，0.3至2.0％Mn，1.3至2.5％Cr，0.3至1.0％Mo和<0.0012％O ％，并且余量的铁具有不可避免的杂质。此外，当要检查的面积为320mm ^{2 时，将氧化物基非金属夹杂物的最大直径控制为≤12.5μm，并且具有直径的氧化物基非金属夹杂物的数量也被控制为≤12.5μm。当要检查的区域为320 mm ^{2 时，＆ge; 3μm的等效圆的最大误差控制为＆le; 250个。另外，通过渗碳处理将表层部分中的C浓度控制在0.7％至1.2％的范围内。版权所有：（C）2004，日本特许厅}}

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公开/公告号JP2003306743A

专利类型
公开/公告日2003-10-31

原文格式PDF
申请/专利权人 JFE STEEL KK;KOYO SEIKO CO LTD;
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申请/专利号JP20020116065
发明设计人 GOTO MASAO;MATSUZAKI AKIHIRO;IWAMOTO TAKASHI;KIZAWA KATSUHIKO;
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申请日2002-04-18
分类号C22C38/00;C21D1/06;C22C38/38;
国家 JP
入库时间 2022-08-22 00:18:13

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