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    • 4. 发明授权
    • Austenitic stainless steel with improved resistance to corrosion by
nitric acid
    • 奥氏体不锈钢具有改善的耐硝酸腐蚀性能
    • US4671929A
    • 1987-06-09
    • US635104
    • 1984-07-27
    • Haruhiko KajimuraHiroo NaganoMinoru Miura
    • Haruhiko KajimuraHiroo NaganoMinoru Miura
    • C22C19/05C22C33/00C22C38/00C22C38/40C22C30/00
    • C22C38/40Y10S376/90
    • An austenitic stainless steel exhibiting improved resistance to corrosion caused by nitric acid is disclosed, which consists essentially of:C: not more than 0.03% by weight, Si: 2-6% by weight,Mn: 0.1-8% by weight, Cr: 20-35% by weight,Ni: 17-50% by weight, Mg: not more than 0.02%,at least one of Nb, Ti and Ta in the total amount of 8.times.C(%) or more, but 1.0% by weight or less,S: not more than 0.003% by weight,Oxygen: not more than 0.003% by weight,N: not more than 0.03% by weight,P: not more than 0.02% by weight,Fe and incidental impurities: balancethe composition further satisfying the following relationships;-10.ltoreq.Ni(Bal).ltoreq.-0.1Cr(%).gtoreq.(7/4)Si(%)+16.5Mg(%)-0.75.times.S(%)-1.5.times.Oxygen(%).gtoreq.0wherein, Ni(Bal)=30.times.C(%)+0.5.times.Mn(%)+Ni(%)+8.2-1.1.times.[1.5.times.Si(%)+Cr(%)].
    • 本发明公开了一种奥氏体不锈钢,其耐硝酸腐蚀性提高,其基本上由以下组成:C:0.03重量%以下,Si:2-6重量%,Mn:0.1-8重量%,Cr :20-35重量%,Ni:17-50重量%,Mg:不大于0.02重量%,Nb,Ti和Ta中的至少一种总量为8×C(%)以上,1.0% 重量以下,S:0.003%以下,氧:0.003%以下,N:0.03质量%以下,P:0.02质量%以下Fe,杂质:平衡 该组合物还满足以下关系: -10%Ni(Bal)≤0.1Cr(%)> / =(7/4)Si(%)+ 16.5 Mg(%)-0.75xS(%) - 1.5×氧(%)> / = 0其中,Ni(Bal)= 30×C(%)+ 0.5×Mn(%)+ Ni(%)+ 8.2-1.1×[1.5×Si(%)+ Cr(%)]。