Is chromium in stainless steel toxic?

Not inherently. Chromium in stainless steel is typically present as trivalent chromium (Cr(III)), which is not considered highly toxic in its original form. The danger occurs during high-heat processes such as welding, thermal cutting or grinding, when chromium may transform into hexavalent chromium (Cr(VI)), a known carcinogen associated with respiratory illness and other long-term health effects.