Cold Work-caused Detriment of Corrosion Resistance of Stainless Steel Tube and Preventative Controls
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摘要: 分析了冷加工对不锈钢钢管耐蚀性损害的原因及相关要素，强调固溶或退火热处理对不锈钢无缝钢管的必要性，同时纠正了其耐蚀性或耐热性必然优于焊接钢管的错误认识；讨论了控制冷加工变形量的意义，并以欧美标准为例介绍了控制原则和方法，其中包括是否要作消除应力热处理，热处理的方法，以及一种由扭曲管构成的热交换器新结构。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.
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