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Must we remove heat treatment discoloration on stainless steel? [Minnesota]October 14, 2009 My company does a little bit of heat treating in house. We heat
treat 17-4 stainless steel (doing an H900 heat treat). Because we do
an air cool we get a heat treat discoloration on all of our parts.
Normally we remove this discoloration via a bead blast and/or
polishing before we clean and passivate the parts. We are wondering
if this is a necessary process. If we leave the discoloration due to
heat treat on the parts is there a larger chance of rust and
corrosion? Mara Schwartz
October 23, 2009 Generally not, as long as a good passivation treatment is still performed, though most customers still want to see a discoloration-free surface even for parts that are destined to be buried inside a mechanism where aesthetics are not a concern.
November 2, 2009 If you can't use a mechanical method or a electropolish to remove the heat treat discoloration, and soaking in Oakite 90 does not remove all the discoloration, what other method is there that will not remove material? We place a very fine thread on the end of a part to aid in adhesive assembly and can not remove any significant material. Robin Mahoney
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