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Welded corrosion-resistant ferritic stainless steel tubing having high resistance to hydrogen embrittlement and a cathodically protected heat exchanger containing the same
Welded corrosion-resistant ferritic stainless steel tubing having high resistance to hydrogen embrittlement and a cathodically protected heat exchanger containing the same
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机译:具有高抗氢脆性的焊接耐腐蚀铁素体不锈钢管和包含该管的阴极保护的热交换器
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摘要
Welded ferritic stainless steel tubing having high resistance to hydrogen embrittlement particularly adapted for use in heat exchangers handling chemical media containing hydrogen sulfide or nascent hydrogen and in cathodically protected heat exchangers. The ferritic stainless steel of the welded tubing consists essentially of, in weight percent, carbon at least 0.002, nitrogen at least 0.002, carbon plus nitrogen 0.02 max. and preferably 0.01 to 0.02, chromium 23 to 28, preferably 25 to 28, manganese up to 1, preferably up to 0.5, nickel 1 to 4, silicon up to 1, preferably up to 0.5, phosphorus up to 0.04, sulfur up to 0.02, preferably up to 0.005, molybdenum 2 to 5, preferably 2 to 4, aluminum up to 0.1, columbium 0.60 max. with columbium being at least equal to eight times carbon plus nitrogen, and the balance iron and incidental impurities.
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