Problems with 17-4 discoloration after passivation
Problems with 17-4 discoloration after passivation
(OP)
Has anyone experienced a coloration between this and improper heat treat? I am a quality/process engineer running a passivation line for medical devices. If we get product (17-4 H900) back from our heat treat vendor that is slightly discolored, and we don’t properly finish it thru polishing or bead blasting, we get dark grey or black discoloration.
RE: Problems with 17-4 discoloration after passivation
Your best bet is to rough machine the part then heat treat it to H900. Now use fine glass bead to mechanically clean the part and then machine/grind the accurate dimensions of the part to final dimensions. This way you will have a clean part ready for passivation.