Properties of Sumitomo 347AP Steel Tube for Hydro-treater in Complex Refinery

摘要

Sumitomo 347AP(UNS S34751) tube has been widely used for hydro-treater in Japanese complex refinery as a substitute for 9-Cr, 321 and 347 for more than 15 years since its especially excellent resistance for sensitization gives reduction of maintenance cost and construction work to omit post-weld heat treatment and neutralize cleaning. This paper describes fundamental property of 347AP as well as its long term usage review and advantages of its application on actual plant.