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Question 56

Alloys with nickel content above _________ are highly resistant to Cl SCC. The greatest susceptibility is 8% to 12% nickel.

    Correct Answer: D

    Alloys with nickel content above 35% are highly resistant to Cl SCC (chloride stress corrosion cracking). The greatest susceptibility is in alloys with 8% to 12% nickel content, making 35% the threshold above which alloys become highly resistant.

Discussion
ahmadmmOption: D

Nickel content of the alloy has a major effect on resistance. The greatest susceptibility occurs in stainless steels with a nickel content of 8 % to 12 %. Alloys with nickel contents - 8% to 12% are the most susceptible - above 35 % are highly resistant, and - above 45 % are nearly immune in refining applications, but cracking can still occur in severe conditions.