( Control of Primary Solidification Mode for Improving Solidification Cracking Resistance , Corrosion Resistance and Cryogenic Toughness of Austenitic Stainless Steel

오스테나이트계 스테인리스강의 응고균열저항 내식성 및 극저온 초성 향상을 위한 초정응고 형식의 제어

Concept of primary solidification mode control was adopted to obtain optimal solidification crack resistance, hot ductility, corrosion resistance and toughness for austenitic stainless steel. By controlling primary solidification phase as primary $\delta$ and containing no ferrite at room temperature, optimal solidification crack resistance, hot ductility, corrosion resistance and cryogenic toughness could be obtained. The optimum chemical composition of austenitic stainless steel ranges 1.46~1.55(Creq/Nieq ratio) calculated by Schaeffler's equation.