FERRITIC-AUSTENITIC STAINLESS STEEL EXCELLENT IN CORROSION RESISTANCE AND WORKABILITY AND PROCESS FOR MANUFACTURING THE SAME

摘要

The present invention relates to ferritic-austenitic stainless steel oriented to have low Ni which is excellent in corrosion resistance, particularly in corrosion resistance in a neutral chloride environment, and has high "uniform elongation" - a factor governing workability - and a method of production for the same. There are independently provided ferritic-austenitic stainless steels and methods of production for the same particularly having a corrosion resistance in a neutral chloride environment satisfying
PI value(=Cr+3Mo+10N-Mn)‰¥18% and having a uniform elongation satisfying
-10‰¤Md‰¤110 (where Md=-551-462({C}+[N])-9.2[Si]-8.1[Mn]-13.7[Cr]-29[Ni]-29[Cu]-18.5[Mo], where [ ] is composition (mass%) in the austenite phase, and { } is average composition (mass%))