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Explore the World of Soft…e: Engineering & Science
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Explore_the_World_of_Software_Engineering_and_Science_HRS_Software_1998.iso
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CL_RESIS.TXT
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1994-11-01
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Austenitic stainless steels may be susceptible to chloride stress
corrosion cracking (CSCC). The standard 304/304L and 316/316L grades are
most susceptible. Increasing nickel content above 18 to 20% or the use
of duplex, or ferritic stainless steels improves resistance to CSCC.
High residual or applied stresses, temperatures above 65-71C (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 in suceptible alloys. 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 alloy
Examples: Alloy 330, 904L.
3) Select a ferritic stainless steel if the lower corrosion resist-
ance is acceptable.
Examples: 439, 26Cr 1Mo, 18Cr 2Mo
4) Select a duplex stainless steel
Examples: 329, 2205.
5) Evaluate stress relief.
Stress relief treatments above 425C (800F) may sensitize
stainless steel to intergranular corrosion, refer to main
menu for more information.