At present, most manufacturers use austenitic stainless steel (such as 304, 304L, 316, 316), 254SMO, 904L, AL6XN and other super austenitic stainless steels have become important materials. For the heat pipe network laid in the trench, when the pipeline at the expansion section of the bellows compensator is low, the rainwater or accidental sewage will be immersed, and materials with stronger corrosion resistance, such as high-nickel alloy and iron-nickel alloy, should be considered. Etc., such as INCOLOY800, INCOLOY825, INCONEL625 and Hastelloy C-276.
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