2 and its production phase stainless steel

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PROBLEM TO BE SOLVED : To provide a duplex phase stainless steel in which a fine crystal grain structure can be readily produced with addition of as small amounts of rare elements as possible. SOLUTION : The duplex phase stainless steel containing an austenitic phase and a ferritic phase is manufactured by : performing cold rolling with rolling reduction rate of ≥80%; and subsequently performing annealing. In the obtained duplex phase stainless steel, the ferritic phase accounts for 30-60% by volume, an aspect ratio in the ferritic phase is COPYRIGHT : (C)2010, JPO&INPIT