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    Hard coatings

    Hmm, can't help you too much there, that stuff's way over my head. I do know that most of the coatings we use here are a blend of cobalt, molybdenum, and chromium. Usually there's nickel involved. Now which ones are oxides...couldn't tell ya. Oh, tungsten carbide, one of the hardest materials...
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    Hard coatings

    Stellite produces a ton of alloy coatings for various different applications. Is that what you were looking for?
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    316L SS suitable for chlorinated water?

    I know that on a lot of the water service pumps we see at my job, we usually use bronze impellers, bushings, etc., so that is one consideration. But as far as I can tell, yes, 316 should be fine.