Study of Corrosion Resistance in Super-Duplex, Tungsten-Containing Stainless Steel

J. Ocean Eng. Technol. 2010;24(5):55-59.

Choi Han-Gul,Park Hyung-Gyun,Jung Byung-Ho,Han Hyun-Sung,Bae Dong-Su,Kang Chang-Yong

Dept. of Metallurgical Engineering Pukyong National University,Dept. of Metallurgical Engineering Pukyong National University,Dept. of Metallurgical Engineering Pukyong National University,Dept. of Industrial Fabrication Korea Polytechnics,Dept. of Adv

텅스텐이 첨가된 슈퍼 2상 스테인리스강의 내부식성에 관한 연구

최한글,박형균,정병호,한현성,배동수,강창룡

부경대학교 금속공학과,부경대학교 금속공학과,부경대학교 금속공학과,한국폴리텍VII대학,동의대학교 신소재공학과,부경대학교 금속공학과

Keywords: Super duplex stainless steel, Corrosion resistance, Sigma phase, Aging treatment, W Substituted

핵심용어: 슈퍼 2상 스테인리스강, 내식성, 시그마상, 시효처리, W 치환

Abstract

The effect of aging on the precipitation of the $sigma$ phase and corrosion resistance in W-substituted, super-duplex stainless steel was investigated. The volume fraction of the $sigma$ phase and the current density increased as the aging temperature increased up to $750^{circ}C$, and, then, they decreased. As aging time increased, the volume fraction of the $sigma$ phase and the current density also increased. The $sigma$ phase considerably influenced to corrosion resistance. When Mo was substituted for W in super-duplex stainless steel, the volume fraction of the $sigma$ phase and the current density both decreased markedly.