发明名称 |
MARTENSITIC-FERRITIC STAINLESS STEEL, MANUFACTURED PRODUCT AND PROCESSES USING THE SAME |
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: TProc−16.9*% Cr−49.9*% Mo>535 |
申请公布号 |
EP3110984(A1) |
申请公布日期 |
2017.01.04 |
申请号 |
EP20150713827 |
申请日期 |
2015.02.25 |
申请人 |
Vallourec Tubos Do Brasil 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 |
分类号 |
C22C38/00;C22C38/42;C22C38/44;C22C38/58 |
主分类号 |
C22C38/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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