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1. 发明公开

EP2679696A4 FORGED STEEL MATERIAL FOR NUCLEAR POWER GENERATION DEVICES, AND WELDED STRUCTURE FOR NUCLEAR POWER GENERATION DEVICES 有权
公开(公告)号：EP2679696A4
公开(公告)日：2018-01-03
申请号：EP12749031
申请日：2012-02-24
申请人： KK KOBE SEIKO SHO (KOBE STEEL LTD )
发明人： TAKAOKA HIROYUKI , FUJITSUNA NOBUYUKI
IPC分类号： C22C38/00 , C21D1/18 , C21D6/00 , C21D8/02 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/54 , C22C38/58 , G21C13/08
CPC分类号： C22C38/001 , C21D1/18 , C21D8/0205 , C21D8/0226 , C21D2211/003 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58 , G21C13/087 , Y02E30/40 , Y10T403/477
摘要： A forged steel for components for nuclear power plants meets a specific chemical composition. The grain size number of a metal structure thereof is 4.5 to 7.0 in terms of ASTM grain size number. It is preferred that the content of N is 0.0100 mass% or more when the mass ratio (A1/N) of the content of A1 to the content of N is 1.93 or more, and that the content of A1 is 0.022 mass% or more when the mass ratio (A1/N) of the content of A1 to the content of N is less than 1.93. The forged steel for components for nuclear power plants exhibits excellent strength, toughness and hydrogen cracking resistance even after being subjected to a stress relief heat treatment subsequent to welding.

2. 发明公开

EP3040438A4 HIGH-STRENGTH STEEL, AND CRANKSHAFT MANUFACTURED USING SAID HIGH-STRENGTH STEEL 审中-公开
标题翻译： HOCHFESTER STAHL UND MIT DIESEM HOCHFESTER STAHL HERGESTELLTE KURBELWELLE
公开(公告)号：EP3040438A4
公开(公告)日：2017-05-17
申请号：EP14841312
申请日：2014-08-26
申请人： KK KOBE SEIKO SHO (KOBE STEEL LTD )
发明人： TAKAOKA HIROYUKI , SHINOZAKI TOMOYA , IBANO AKIRA
IPC分类号： C22C38/00 , C22C38/46 , F16C3/06 , F16C3/08
CPC分类号： C22C38/00 , C22C38/46 , F16C3/08 , F16C2204/62 , F16C2204/72
摘要： An object of this invention is to provide a high-strength steel endowed with high fatigue strength while also having increased strength and toughness, and a crankshaft manufactured using this high-strength steel. The high-strength steel according to the invention contains 0.30 mass % or more and 0.50 mass % or less of C, more than 0 mass % and 0.15 mass % or less of Si, 0.80 mass % or more and 1.5 mass % or less of Mn, 0.8 mass % or more and 2.4 mass % or less of Ni, 1.0 mass % or more and 3.0 mass % or less of Cr, 0.35 mass % or more and 0.70 mass % or less of Mo, 0.10 mass % or more and 0.25 mass % or less of V and 0.001 mass % or more and 0.040 mass % or less of Al, with the balance being iron and inevitable impurities. The high-strength steel is mainly composed of martensit, wherein a Mn concentration in cementite is 0.90 mass % or more and 1.80 mass % or less, and a ratio of Mn content to Si content is 5.50 or more.
摘要翻译：本发明的目的是提供一种高强度钢，其具有高疲劳强度，同时还具有增加的强度和韧性，以及使用该高强度钢制造的曲轴。本发明的高强度钢中，含有C：0.30质量％以上且0.50质量％以下，Si：大于0质量％且0.15质量％以下，0.80质量％以上且1.5质量％以下 Mn：0.8质量％以上且Ni：2.4质量％以下，Cr：1.0质量％以上且3.0质量％以下，Mo：0.35质量％以上且0.70质量％以下，Mo：0.10质量％以上，Mn： V：0.25质量％以下，Al：0.001质量％以上且0.040质量％以下，其余为铁和不可避免的杂质。高强度钢主要由马氏体组成，其中渗碳体中的Mn浓度为0.90质量％以上且1.80质量％以下，且Mn含量与Si含量之比为5.50以上。

3. 发明公开

EP3085804A4 HIGH-STRENGTH STEEL FOR STEEL FORGINGS, AND STEEL FORGING 有权
标题翻译： HOCHFESTER STAHLFÜRSTAHLSCHMIEDESTÜCKEUNDSTAHLSCHMIEDESTÜCK
公开(公告)号：EP3085804A4
公开(公告)日：2017-06-21
申请号：EP14872514
申请日：2014-11-07
申请人： KK KOBE SEIKO SHO (KOBE STEEL LTD )
发明人： TAKAOKA HIROYUKI , IKEGAMI TOMONORI
IPC分类号： C22C38/00 , C21D6/00 , C21D8/00 , C21D8/10 , C21D9/30 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/54
CPC分类号： C22C38/54 , B21K23/00 , C21D1/18 , C21D6/004 , C21D7/13 , C21D8/00 , C21D8/105 , C21D9/0068 , C21D9/30 , C21D2211/002 , C21D2211/003 , C21D2211/004 , C21D2211/008 , C22C38/00 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48
摘要： The high-strength steel for steel forgings according to the present invention has a composition that includes, as basic components, C: 0.35 mass% to 0.47 mass%; Si: 0 mass% to 0.4 mass%; Mn: 0.6 mass% to 1.5 mass%; Ni: more than 0 mass% up to 2.0 mass%; Cr: 0.8 mass% to 2.5 mass%; Mo: 0.10 mass% to 0.7 mass%; V: 0.035 mass% to 0.20 mass%; Al: 0.015 mass% to 0.050 mass%; N: 30 ppm to 100 ppm, and O: more than 0 ppm up to 30 ppm, the balance being Fe and inevitable impurities. The metal structure is mainly bainite, martensite or a mixed structure of bainite and martensite. Among cubic B1-type precipitates, the number of coherent precipitates having a diameter equal to or smaller than 30 nm is equal to or smaller than 50 /µm 2 .
摘要翻译：本发明的钢锻件用高强度钢的组成以C：0.35〜0.47质量％作为基本成分， Si：0质量％〜0.4质量％ Mn：0.6质量％〜1.5质量％ Ni：大于0质量％至2.0质量％; Cr：0.8质量％〜2.5质量％ Mo：0.10质量％〜0.7质量％ V：0.035质量％〜0.20质量％ Al：0.015质量％〜0.050质量％ N：30ppm〜100ppm，O：大于0ppm〜30ppm，其余为Fe和不可避免的杂质。金属组织主要是贝氏体，马氏体或贝氏体和马氏体的混合组织。在立方形的B1型析出物中，直径30nm以下的凝聚析出物的个数为50个/μm2以下。

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