316L shows a rainbow color in the oil film after being cooked in a pressure cooker with tap water for two hours. What is the reason?
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316L shows a rainbow color in the oil film after being cooked in a pressure cooker with tap water for two hours. What is the reason? I tested it with potion and it is indeed 316, but I don’t know whether it is 316L, 316F or 316. ；
In the picture, the parts that are not discolored are those that have been pasted with high-temperature tape, so there is no discoloration.； Other places have turned into the color of an oil film.
The material that can produce a golden film must be a good white material~~~~~ Rotten materials will have rust spots, and even worse materials will have black spots and pockmarks. Jiangsu is rich in rotten stainless steel.
handsome guy: This stainless steel material seems to be really produced in Jiangsu! In addition, after boiling, tap water turns "purple red", not gold. Please tell me, handsome guy, can this be used to determine whether the stainless steel is not 316L? The potion I have on hand can only tell that it is 316, but I can’t tell which kind of 316 it is. ；
The potion seems to be only for qualitative identification of nickel content, right? ,, I don’t know much about this aspect. I don’t know if there is any special potion for 316L. Most of the materials tested in our unit are sent to the Xi’an Gold Research Institute. Making a sample costs several hundred yuan. Stainless steel is quite complicated. We have encountered 321 materials. The magnetism is seriously too high, but the material content test is qualified, and the annealing treatment has no effect. This C26W liquid level probe has been soaked in the sewage tank of the sewage treatment plant for 12 years, and it just broke. This probe is made of genuine materials. The discolored part on the outer casing is a uniform and dense film. The film can be scraped off with a blade, and the film underneath is bright white. . . . .