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  1. Mike31416

    Clean, Pickle & Passivate 304 SS - Problems

    I've been working on a problem with passivating 304 SS tubes for some number of weeks. I've combed through ASTM A967 and A380 several times. Our process, at face value, meets the specification. We use an alkaline cleaner (tripolyphosphate based), followed by 20% nitric acid & 1% ammonium...

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