In order to solve the embrittlement problems of B-2 alloy, without sacrificing its excellent corrosion resistance, a research program was undertaken that led to the development of B-3 alloy (N10675) (Ref 8 ). By carefully controlling additions of iron, chromium, and manganese, the equilibrium structure of the alloy was redirected toward the Ni3Mo transformation, which is more sluggish than the Ni4Mo transformation. This provides more time to effect a heat treatment without the risk of cracking. The new alloy is also more resistant to SCC (Ref 9).