自动门
自动门:不锈钢板材和型材
发布时间:2013/5/4
自动门讯:
不锈钢板材和型材
    不锈钢是以铬元素为主要元素的合金钢,通常是指含铬12%的具有耐腐蚀性能的铁
基合金。铬含量越高,钢的抗腐蚀性越好。除铬外,不锈钢中还含有镍(Ni)、锰(Mn)、
钛(Ti)、硅(Si)等元素,这些元素都能影响不锈钢的强度、塑性、韧性和耐腐蚀性。
    (1)不锈钢的耐腐蚀原理。    ‘
    由于铬的性质比铁活泼,在不锈钢中,铬首先与环境中的氧化合,生成一层与钢基体
牢固结合的致密的氧化膜层,称作钝化膜,它能使合金钢得到保护,不致锈蚀。
  ·(2)不锈钢的分类。
  按其化学成分可分为铬不锈钢、铬镍不锈钢和高锰低铬不锈钢等几类。按不同耐腐蚀
特点,又可分为普通不锈铜(简称不锈钢)和耐酸钢两类。前者具有耐大气和水蒸气侵蚀
的能力,后者除对大气和水蒸气有抗腐蚀能力外,还对某些化学侵蚀介质(如酸、碱、盐
溶液)具有良好的抗腐蚀性。常用的不锈钢有40多个品种,其中建筑装饰用不锈钢主要
是Cr18 ~118、OCr17T1和lCr17Mn2T1等几种。还可根据不锈钢在900~1100℃高温淬火
处理后的反应和微观组织分为铁索体系不锈钢(淬火后不硬化)、马氏体系不锈钢(淬火
后硬化)、奥氏体系不锈钢(高铬镍型)。
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