We installed seal auxilairy system of SS material in gas plant after one year service the surace started rusting wat may be the probable reason for this.
could be several reasons 1. was there any carbon steel wire brushes used on the material 2. sparks from cutting, grinding or welding around the material. 3. was there any welding done with a different type welding rod. There is probably several others I'm not aware of, but these are a few I have seen.
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