The superplastic duplex austenitic-ferritic stainless steel-0.021C
24. 16Cr
7.21Ni
2.87Mo
0. 17N
0.48Cu has been developed by arc furnace + electroslag remelting process. The test results showed that the pitting erosion resistance and the crevice corosion resistance of superplastic duplex stainless steel 00Cr25Ni7Mo3N were much more higher than that of traditional austenite stainless steel 304L and 316L. The maximum elongation of superplastic duplex stainless steel 00Cr25Ni7Mo3N at 960℃ with strain rate 2×10-³/s was 960%
and the uniformity during superplastic deformation of the duplex steel was higher than that of titanium alloy TC4 to obviously decrease the weight of component.