"Annealed 300ss Eats stamping Dies"

Question:

"We purchase Annealed 300ss coil material for stamping, from time to time we recive material that eats up our dies, I think the material has a very thin Oxide surface on it, But its very hard to detect, I have tryed to micro hardness test it knowing that a Oxide surface should be much harder than the annealed 300ss but cant detect anything. Is there a test that i can perform to show this oxidation."

Answer:

The 300 series stainless steels, i.e., 304SS/316SS, contain a thin oxide film on the order of less than one micron thick. Its thickness cannot be measured using conventional means. The thin oxide film is what imparts the corrosion resistance or "stainless" properties. I doubt that it causing your die wear problems.

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