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1. 发明授权

US5733387A Duplex stainless steel, and its manufacturing method 失效
标题翻译：双相不锈钢及其制造方法
公开(公告)号：US5733387A
公开(公告)日：1998-03-31
申请号：US776806
申请日：1997-02-04
申请人： Yong Deuk Lee , Kwang Tae Kim , Bong Un Kim , Yong Heon Lee
发明人： Yong Deuk Lee , Kwang Tae Kim , Bong Un Kim , Yong Heon Lee
IPC分类号： C21D8/00 , C21D8/02 , C22C38/00 , C22C38/44 , C22C38/58
CPC分类号： C21D8/0226 , C21D8/005 , C22C38/001 , C22C38/44 , C21D2211/001 , C21D2211/005 , C21D8/021 , C21D8/0263
摘要： A duplex stainless steel consisting of a ferrite phase and an austenite phase is disclosed which is superior in the hot ductility, the high temperature oxidation resistance, the corrosion resistance and the impact toughness. The duplex stainless steel is applied to marine facility and the like. The duplex stainless steel which consists of a ferrite phase and an austenite phase is composed of in weight %: less than 0.03% of C, less than 1.0% of Si, less than 2.0% of Mn, less than 0.04% of P, less than 0.004% of S, less than 2.0% of Cu, 5.0-8.0% of Ni, 22-27% of Cr, 1.0-2.0% of Mo, 2.0-5.0% of W, and 0.13-0.30% of N. Or there are further added one or two elements selected from a group consisting of: less than 0.03% of Ca, less than 0.1% of Ce, less than 0.005% of B and 0.5% of Ti. Further, the ratio (Cr.sub.eq /Ni.sub.eq) of the Cr equivalent (Cr.sub.eq) to the Ni equivalent (Ni.sub.eq) is 2.2-3.0. Further, the weight ratio (W/Mo) of the W to Mo is 2.6-3.4. That is, the duplex stainless steel of the present invention satisfies the above condition, and the Ni.sub.eq and Cr.sub.eq are defined as follows: Ni.sub.eq =%Ni+30.times.%C+0.5.times.%Mn+0.33.times.%Cu+30.times.(%N-0.045), Cr.sub.eq =%Cr+Mo+1.5.times.%Si+0.73.times.%W.
摘要翻译： PCT No.PCT / KR96 / 00084 Sec。 371日期1997年2月4日 102（e）1997年2月4日PCT PCT 1996年6月5日PCT公布。第WO96 / 39543号公报日期：1996年12月12日公开了一种由铁素体相和奥氏体相组成的双相不锈钢，其在热延展性，耐高温氧化性，耐腐蚀性和冲击韧性方面优异。双相不锈钢应用于海洋设施等。由铁素体相和奥氏体相组成的双相不锈钢由重量％组成：小于0.03的C，小于1.0的Si，小于2.0的Mn，小于0.04的P，少超过0.004％的S，小于2.0％的Cu，5.0-8.0％的Ni，22-27％的Cr，1.0-2.0％的Mo，2.0-5.0％的W和0.13-0.30％的N.或者进一步添加一种或两种选自以下的元素：小于0.03％的Ca，小于0.1％的Ce，小于0.005％的B和0.5％的Ti。此外，Cr当量（Creq）与Ni当量（Nieq）的比（Creq / Nieq）为2.2-3.0。此外，W与Mo的重量比（W / Mo）为2.6〜3.4。也就是说，本发明的双相不锈钢满足上述条件，Nieq和Creq定义如下：Nieq =％Ni + 30x％C + 0.5x％Mn + 0.33x％Cu + 30x（％ 0.045），Creq =％Cr + Mo + 1.5×Si + 0.73×W。

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