Abstract
In this study, the corrosion resistance of type D 308 L and D 316 L weld metals was evaluated by test in boiling solution of 65% nitric acid.The experimental results are as follows.(1) Chromium is beneficial to decrease corrosion rate. Manganese and Nickel have no effect.(2) The fully austenitic weld metal has a stronger corrosion resistance than the partially ferritic weld metal as welded condition, but adverse in weld metals with sensitizing heat treatment.(3) Weld metals aged at temperature of 650 to 750°C have remarkably high rates of corrosion attack.(4) In the partially ferritic weld metal, chromium carbide (Cr 23 C 6) precipitates in the grain boundary and interior of ferrite-phase ane the carbide precipitation in the austenitic grain boundary is extremely reduced, so the corrosion resistance is improved.
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