However, the annealing of material subjected to low levels of cold-work (less than about 7 to 10% outer fiber elongation) is generally not suggested since it can result in abnormal grain growth, leading to a surface condition known as “orange peel” or “alligator hide”, and significantly affect properties. This is particularly important for restoring resistance to stress corrosion cracking, in the case of the corrosion-resistant alloys. A final (solution) anneal is recommended after the completion of such successive forming/annealing operations, to restore the material to its optimum condition and properties. Under most circumstances, this should be a solution anneal (the temperatures for which are given in the Heat Treatment section). However, for higher levels of cold deformation, where cracking is a possibility due to a reduction in ductility, a series of successive forming operations is recommended, each followed by an intermediate annealing treatment. Generally, as-supplied materials (annealed at the Haynes International mills) have sufficient ductility for mild forming.
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