are 304 stainless steel which is also called 18-8 stainless steel. It contains 18% Chromium and 8% Nickel. Some steel mills do cost reduction by reducing Chromium to lower specification allowed. Also, Chromium may be precipitated making them unevenly distributed. I have a new kitchen sink which rusts locally because of low Chromium content at those areas.
Best regards,
Alex
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