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Corrosion by caustic (sodium or potassium hydroxide) at all concentrations is easily handled at room temperature with a variety of metals and alloys, including carbon steels. It becomes increasingly more corrosive with increasing temperature and concentration. The useful safe limit of carbon steel is approximately 65C, both with regard to caustic stress corrosion cracking (CSCC) and corrosion. Stainless steels (including 304) are more resistant to general corrosion compared with carbon steel; however, they can suffer CSCC at approximately 120C. |
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