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1. 发明申请

WO2015127523A4 MARTENSITIC-FERRITIC STAINLESS STEEL, MANUFACTURED PRODUCT AND PROCESSES USING THE SAME 审中-公开
标题翻译：马氏体型铁素体不锈钢，使用相同的制造产品和工艺
公开(公告)号：WO2015127523A4
公开(公告)日：2015-09-03
申请号：PCT/BR2015/050016
申请日：2015-02-25
申请人： VALLOUREC TUBOS DO BRASIL S.A. , VILLARES METALS S.A.
发明人： DE CARVALHO, Ricardo Nolasco , FERREIRA, Marcelo Almeida Cunha , DE LIMA, Marília Mendonça , MESQUITA, Rafael Agnelli , FARINA, Alexandre Bellegard , LIBERTO, Rodrigo Cesar Nascimento
IPC分类号： C22C38/00 , C22C38/42 , C22C38/44 , C22C38/58
摘要： The present invention relates to a martensitic-ferritic stainless steel with high corrosion resistance that comprises the following chemical composition: C: from 5 0.005 to 0.030%; Si: from 0.10 to 0.40%; Mn from 0.20 to 0.80%; P: 0.020% max; S: 0.005% max; Cr: from 13 to 15%; Ni: from 4.0 to 6.0%; Mo: from 2.0 to 4.5%; V: from 0.01 to 0.10%; Nb: from 0.01 to 0.50%; N: from 0.001 to 0.070%; Al: from 0.001 to 0.060%; Ti: from 0.001 to 0.050%; Cu: from 0.01 to 1.50%; O: 0.005% max (all in weight percent), wherein the balance is performed by Fe and unavoidable impurities 10 from the industrial possessing in acceptable levels. Additionally, the martensitic- ferritic stainless steel of the present invention has the localized corrosion parameter (LCP), between 3.2 and 6.2, as defined by equation below; LCP = 0.500-%Cr + 1.287 ⋅ %Mo + 1.308⋅%N —5.984 The present invention also relates to a manufactured product comprising the martensitic-ferritic stainless steel of the invention; to a process for 15 production of forged or rolled parts or bars; and to a process for production of seamless tube from this martensitic-ferritic stainless steel of the present invention, wherein the processes of the invention have a heating temperature in determined step following the equation below: T Proc - 16.9 * % Cr -49.9 *% Mo > 535
摘要翻译：本发明涉及具有高耐腐蚀性的马氏体 - 铁素体不锈钢，其包含以下化学组成：C：0.005〜0.030％; Si：0.10至0.40％; Mn从0.20至0.80％; P：最大0.020％; S：最多0.005％; Cr：13至15％; Ni：4.0-6.0％; Mo：2.0至4.5％; V：0.01-0.10％; Nb：0.01至0.50％; N：0.001至0.070％; Al：0.001至0.060％; Ti：0.001-0.050％; Cu：0.01-1.50％; O：最多0.005％（全部以重量百分比计），其中余量由Fe和来自具有可接受水平的工业中的不可避免的杂质10进行。此外，本发明的马氏体 - 铁素体不锈钢具有3.2至6.2之间的局部腐蚀参数（LCP），如下式所定义; LCP = 0.500-％Cr + 1.287·％Mo + 1.308·％N-5.984本发明还涉及包含本发明的马氏体 - 铁素体不锈钢的制造产品; 到生产锻造或轧制零件或棒材的过程; 本发明的马氏体 - 铁素体系不锈钢的无缝钢管的制造方法，其特征在于，本发明的制造方法中，加热温度按照下述公式确定：T -16.9 *％Cr -49.9 *％Mo> - - - - - - - - - - 535

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