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Nickel Alloys
A general guide to machining nickel-iron alloys
Nickel Alloys : 19 April, 2013
Nickel-iron alloys are not hardenable by heat treatment. The alloys can be made harder though cold working only. The annealed hardness for these alloys is generally in the range of RB 70/80. Material in the annealed condition will be more difficult to machine because it is soft and gummy. The tools tend to plow the metal instead of cutting into it and do not easily form chips. Surface scale oxide is tightly adherent and penetrates the surface to a greater extent than stainless steels. According to Ed Fagan, machining is considerably improved by descaling the material.
 
 
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