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日本钢管公司开发了含铬9%～20%的不锈钢系形状记忆合金(SMA),并制成管接头,用于大楼内配管系统的连接。该公司生产的SMA管接头材料的典型化学成分为:9%Cr 5%Ni,14%Mn,6%Si,余为Fe。该SMA合金的形状记忆特性属单向型,回复变形量最大值为4%,马氏体转变开始点为323 K,奥氏体转变终止点为573 K。耐点蚀性和耐均匀腐蚀性类似于430和420型铁素体不锈钢,表面具有稳定
Nippon Steel Pipe Company has developed a stainless steel shape memory alloy (SMA) containing 9% to 20% chromium and made a pipe joint for the connection of piping systems in the building. The typical chemical composition of the company’s SMA fitting material is: 9% Cr 5% Ni, 14% Mn, 6% Si, the remainder being Fe. The shape memory property of the SMA alloy is unidirectional. The maximum value of the amount of deformation is 4%, the starting point of martensite transformation is 323 K, and the ending point of austenite transformation is 573 K. Pitting corrosion resistance and uniform corrosion resistance similar to 430 and 420 ferritic stainless steel, the surface has a stable