Abstract
The localized corrosion associated with phase transformation of tube-to-tube sheet welds of hyper duplex stainless steel (HDSS) was investigated in acidified chloride environments. The localized corrosion resistance of the HDSS tube-to-tube sheet welded with an Ar shielding gas supplemented with N2 increased greatly due to a decrease in the α-phase fraction and Cr2N, and a decrease in the pitting resistance equivalent number (PREN) difference between the α-phase and γ-phase in the weld metal and heat-affected zone. It was found that the HDSS tube-to-tube sheet welds showed significantly better localized corrosion resistance than a costly super austenitic grade (S32050) welds.
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