Corrosion resistance is dependant on Chromium and the degree of polish obtained. As far as Chromium is concerned the free Chromium oxide film which is impervious for corrosion attack.
As its well known carbon can combine with 17 times its own weight of chromium helps to achieve to form carbides. In this case this works out 0.09 x 17 = 1.53. The minimum Chromium maintained in these Steel is 14.5% so the recommended level of atmospheric conditions the chromium does not play any significant role in Corrosion resistance.
So the Carbon content does not affect Chromium content much and thus does not affect corrosion resistance properties.
Can Copper be a health hazard?
Copper is in solid solution in austenite and the level maintained in this type of Steel is only 1.8%, which is much lower than the solubility limit of Copper which is 4%.
Thus there is no evidence of adverse effect due to presence of Copper.
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