Stainless Steels in Supply and Waste Water Systems (OGCP ref OG 2.2)

Localised corrosion mechanisms pitting, crevice and stress corrosion cracking are mentioned, but normally stainless steels are considered "inert" in supply (or town's) waters. The affect of chloride levels, temperature, oxygen levels, flow rates and bacterial oxidants ie chlorine on the resistance of stainless steels in waters is discussed. Crevice corrosion should be rare at chloride levels below 200 and 1000 ppm (mg/lt) respectively for 304 (1.4301 / 1.4307) and 316 (1.4401 / 1.4404) types. Water chloride ranges for duplex 1.4462 (2205) super austenitic 254SMO (1.4547) and super duplex types SAF2507 (1.4410) and Zeron 100 (1.4501) are also shown.

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