DUPLEX STAINLESS STEEL HAVING EXCELLENT DEEP DRAWING PROPERTIES

A duplex stainless steel having excellent deep drawing properties, according to one embodiment of the present invention, comprises 0.01-0.17% of C, 0.2-1.0% of Si, 3-11% of Mn, 18-22% of Cr, 0.05-0.25% of N, and the remainder being Fe and other inevitable impurities, and contains a component having...

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Bibliographische Detailangaben
Hauptverfasser: KIM, BONG WN, KANG, HYUNG GU, CHAE, DONG CHUL, JO, GYU JIN
Format: Patent
Sprache:eng ; fre ; kor
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Zusammenfassung:A duplex stainless steel having excellent deep drawing properties, according to one embodiment of the present invention, comprises 0.01-0.17% of C, 0.2-1.0% of Si, 3-11% of Mn, 18-22% of Cr, 0.05-0.25% of N, and the remainder being Fe and other inevitable impurities, and contains a component having a value in which a Modified Md30 value represented by the following formula is less than Critical Md30. (Modified Md30=551-[462*(C+N)/(1-0.01*Φ)]-9.2*Si-8.1*Mn-13.7*Cr-29*Ni-29*Cu-18.5*Mo, Critical Md30=2*Φ-20, Φ(%)=-60.9-148*C-1.30*Mn-10.7*Ni-4.57*Cu+5.77*Si+7.20*Cr-144*N+11.4*Mo, and each element is wt%) Un acier inoxydable duplex présentant d'excellentes propriétés d'emboutissage profond, selon un mode de réalisation de la présente invention, comprend de 0,01 à 0,17 % de C, 0,2 à 1,0 % de Si, 3 à 11 % de Mn, 18 à 22 % de Cr, 0,05 à 0,25 % de N, le reste étant du Fe et d'autres impuretés inévitables, et renferme un composant ayant une valeur dans laquelle une valeur Md30 modifiée représentée par la formule suivante est inférieure à Md30 critique. (Md30 modifié =551-[462*(C+N)/(1-0,01*Φ)]-9,2*Si-8,1*Mn-13,7*Cr-29*Ni-29*Cu-18,5*Mo, Md30 critique =2*Φ-20, Φ(%)=-60,9-148*C-1,30*Mn-10,7*Ni-4,57*Cu+5.,77*Si+7,20*Cr-144*N+11,4*Mo, et chaque élément est en % en poids). 본 발명의 일 실시예에 따른 심가공 특성이 우수한 듀플렉스 스테인리스강은 C: 0.01~0.17%, Si: 0.2~1.0%, Mn: 3~11%, Cr:18~22%, N: 0.05~0.25%, 나머지는 Fe 및 기타 불가피한 불순물을 포함하고, 하기 식으로 표현되는 Modified Md30 값이 Critical Md30보다 작은 값을 갖도록 하는 성분을 포함한다. (Modified Md30 = 551-[462*(C+N)/(1-0.01*Φ)]-9.2*Si-8.1*Mn-13.7*Cr-29*Ni-29*Cu-18.5*Mo, Critical Md30 = 2*Φ-20, Φ(%) = -60.9-148*C-1.30*Mn-10.7*Ni-4.57*Cu+5.77*Si+7.20*Cr-144*N+11.4*Mo, 각 원소는 wt%임)