Effect of amount of tantalum on corrosion behavior of high corrosion resistant standard duplex stainless steels - Development of high corrosion resistant duplex stainless steels by inclusion control( 2)

摘要

Duplex stainless steel has high corrosion resistance and high strength. However, pitting corrosion occurs in duplex stainless steel in the solution containing high concentrated chloride ion. Pitting corrosion is caused by dissolution of inclusion, such as manganese sulfide( MnS). In previous study, the pitting corrosion resistance of the super duplex stainless steels including 20 ppmS could improve by Ta addition in the steels. In this study, we investigated the effect of addition of Ta on pitting corrosion behavior in standard duplex stainless steels including 10 ppm S. In conclusion, we observed that pitting corrosion resistance of standard duplex stainless steels could improve by addition over 0.06 mass addition of Ta.