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公开(公告)号：US09128018B2
公开(公告)日：2015-09-08
申请号：US14205876
申请日：2014-03-12
申请人： HITACHI METALS, LTD.
CPC分类号： G01N17/006 , G01N3/32 , G01N2203/0005 , G01N2203/0066 , G01N2203/0075 , G01N2203/024
摘要： A method for evaluating the corrosion-fatigue life of a steel material includes: bringing a corrosive medium into contact with a predetermined portion of the steel material; measuring strain on the steel material while applying cyclic loads to the steel material; measuring an N-th strain index from strain amplitude at the number of initial load applications and strain amplitude at the N-th load application (N is a natural number larger than the number of initial load applications); and estimating the corrosion-fatigue life of the steel material by comparing the N-th strain index with a previously certified life strain index.
摘要翻译： 评估钢材的耐腐蚀寿命的方法包括：使腐蚀介质与钢材的预定部分接触; 在钢材上施加循环载荷时测量钢材上的应变; 在第N次载荷施加下，初始载荷应用数量和应变幅度下的应变振幅测量第N个应变指数（N是大于初始载荷应用数量的自然数）; 并通过将第N个应变指数与先前认证的寿命应变指数进行比较来估算钢材的腐蚀疲劳寿命。
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公开(公告)号：US10196719B2
公开(公告)日：2019-02-05
申请号：US14770920
申请日：2014-02-20
申请人： HITACHI METALS, LTD.
IPC分类号： C22C38/46 , C21D1/25 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/42 , C22C38/44 , B29C33/38 , C21D1/18 , C21D6/00 , C21D9/00 , C22C38/06 , C21D9/22
摘要： A mold steel that is a steel having a composition containing, in terms of mass %: 0.07 to 0.15% of C; more than 0 and less than 0.8% of Si; more than 0 and not more than 1.0% of Mn; less than 0.05% of P; less than 0.02% of S; more than 0 and not more than 0.5% of Ni; more than 0 and less than 0.8% of Mo and W, either alone or as a complex (Mo+½W); more than 0 and less than 0.15% of V; and 0.25 to 1.5% of Cu, with the balance consisting of Fe, Cr and unavoidable impurities, wherein the content of Cr is more than 4.9% and not more than 5.3% and the hardness of the mold steel is 30 to 42 HRC.
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