冷加工對不銹鋼鋼管耐蝕性的損害及其控制

Cold Work-caused Detriment of Corrosion Resistance of Stainless Steel Tube and Preventative Controls

摘要: 分析了冷加工對不銹鋼鋼管耐蝕性損害的原因及相關(guān)要素，強(qiáng)調(diào)固溶或退火熱處理對不銹鋼無縫鋼管的必要性，同時(shí)糾正了其耐蝕性或耐熱性必然優(yōu)于焊接鋼管的錯(cuò)誤認(rèn)識；討論了控制冷加工變形量的意義，并以歐美標(biāo)準(zhǔn)為例介紹了控制原則和方法，其中包括是否要作消除應(yīng)力熱處理，熱處理的方法，以及一種由扭曲管構(gòu)成的熱交換器新結(jié)構(gòu)。

Abstract: Analyzed here in the article are the reasons for and elements related to cold work-caused detriment of corrosion resistance of the stainless steel tube. The necessity of solution or annealing heat treatment for the seamless stainless steel tube is emphasized， while the wrong understanding is corrected that corrosion resistance and heat resistance of the seamless stainless steel tube is certainly better than those of the weld steel tube. The importance of properly controlling of the material’s deformation amount during cold working process，and control principles and methods that based on applicable standards of Europe and America are introduced， including decision-making concerning whether stress-relief heat treatment is needed or not，the heat treatment methods，and a newly-developed structure of heat-exchanger composed of twisted tubes.