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CL_RESIS.TXT
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1989-04-11
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Austenitic stainless steels are susceptible to chloride stress corrosion
cracking (CSCC). The standard 304/304L and 316/316L grades are most
susceptible. Increasing nickel content and decreasing carbon content
improves resistance to CSCC. High residual or applied stresses, temperatures
above 150-160F and chlorides increase the likelihood of CSCC. Crevices and
wet/dry locations such as liquid vapor interfaces and wet insulation are
particularly likely to initiate CSCC. Initiation may occur in several weeks,
in 1-2 years or after 7-10 years in service.
Methods of minimizing chloride stress corrosion cracking:
1) Improve design
Examples: Fill or seal crevices, paint under insulation, keep
tensile stresses below the yield strength, shot peen, provide
galvanic or cathodic protection.
2) Select a higher nickel content austenitic stainless steel
Examples: Alloy 20, 904L, alloy 800
3) Select a ferritic stainless steel with adequate general corrosion
resistance.
Examples: 439, 26Cr 1Mo, 18Cr 2Mo, 29-4C
4) Select a duplex stainless steel
Examples: 329, 2205, 255
5) Evaluate stress relief.
Stress relief treatments above 800F may sensitize stainless steel
to intergranular corrosion, refer to main menu for more
information.