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자동차 배기계 플랜지용 16~19 wt.% 페라이트 주조용 스테인리스강 개발
장희진(HeeJin Jang),범원진(Won-Jin Beom),박찬진(Chan-Jin Park) 한국표면공학회 2009 한국표면공학회지 Vol.42 No.2
We aimed to develop a Fe-(16~19)Cr-(0.1~0.6)Ti-(0.1~0.6)Nb stainless steel for automotive exhaust parts with h igh corrosion resistance. Th e alloys w ith h igh Cr content sh owed h igh resistance to general corrosion and also localized corrosion. The increase of Ti and Nb contents resulted in a linear increase in the general corrosion resistance, while the pitting potential was improved by addition of these elements up to about 0.4 wt.%. The low-carbon Fe-17Cr-0.4Ti-0.4Nb alloy annealed at 850oC and air-cooled was considered to be the optimum alloy for our purpose with the critical anodic current density of 247 ㎂/㎠ in 0.05 M H₂SO₄ solution and the pitting potential of 310 ㎷SCE in 0.2 M NaCl solution.