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  1. #11
    Join Date
    Oct 2009
    Posts
    306

    Default

    316l is food grade and will show some staining if exposed to corrosive solutions but it depends on temperature as well. It may appear to have a brownish colour when exposed to a warm sea water environment. I would say there is some degredation caused by welding if you are seeing rust after only exposing it to water.
    Last edited by jrscgsr; 05-05-2013 at 05:16 AM.
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  2. #12
    Join Date
    Jan 2007
    Location
    Alberta Red Deer
    Posts
    373

    Default

    also keep in mind that 95% of suppliers store, move, clamp stainless with steel forks, racks and steel clamps... so there will be carbon transfer and were ever steel scratches or rests against stainless it will start to rust when exposed to water.. but from what you have said and is oxidizing in the weld zone i will agree that it was welded too slow and you burnt out the chrome in the weld zone (sugaring, or carbide participation). you can pickle the stainless after to help with the discoloration but it will still rust eventually as there is no chemical process that will add more chrome back to the weld zone to prevent this.
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