| 发明名称 |
Duplex Stainless Steel |
| 摘要 |
The present invention relates to duplex ferritic austenitic stainless steel for the use chemical industry for nitric acid environments wherein good uniform corrosion resistance and high strength are required. The microstructure of the stainless steel has 35-65 volume % of ferrite, preferably 45-55 volume % of ferrite, the balance being austenite. The chemical composition contains less than 0.03 weight % carbon, less than 1 weight % silicon, less than 3 weight % manganese, 26-29.5 weight % chromium, 5-8.5 weight % nickel, 1-3 weight % molybdenum, 0.25-0.35 weight % nitrogen, 1-3 weight % copper, the rest being iron and inevitable impurities occurring in stainless steels. |
| 申请公布号 |
US2015050180(A1) |
申请公布日期 |
2015.02.19 |
| 申请号 |
US201214355866 |
申请日期 |
2012.11.01 |
| 申请人 |
Outokumpu Oyj |
发明人 |
Thulin Alexander;Jonsson Jan Y.;Liljas Mats;Pettersson Rachel;Andersson Jan-Olof;Hertzman Staffan |
| 分类号 |
C22C38/58;C22C38/04;C22C38/02;C22C38/00;C22C38/44;C22C38/42 |
主分类号 |
C22C38/58 |
| 代理机构 |
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代理人 |
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| 主权项 |
1. A duplex ferritic austenitic stainless steel for use in the chemical industry for nitric acid environments wherein good uniform corrosion resistance and high strength are required, wherein the microstructure of the stainless steel has 35-65 volume % of ferrite, preferably 45-55 volume % of ferrite, the balance being austenite, and the chemical composition contains less than 0.03 weight % carbon, less than 1 weight % silicon, less than 3 weight % manganese, 26-29.5 weight % chromium, 5-8.5 weight % nickel, 1-3 weight % molybdenum, 0.25-0.35 weight % nitrogen, 1-3 weight % copper, the rest being iron and inevitable impurities occurring in stainless steels, and wherein the sigma equivalent SGR (Cr+2×Mo−40×N+0.5×Mn−2×Cu) is less than 18. |
| 地址 |
Espoo FI |
