SHAPE-MEMORY ALLOY, FLAT STEEL PRODUCT MADE THEREFROM WITH PSEUDO-ELASTIC PROPERTIES, AND METHOD FOR PRODUCING SUCH A FLAT STEEL PRODUCT

摘要

The invention relates to a shape-memory alloy which allows a flat steel product to be produced with less effort than in the prior art, said product having a high restoring capability. For this purpose, the shape-memory alloy according to the invention consists of (in wt.%) C: ≤ 1%, Mn: 30 - 40%, AI: 6 - 10%, Co: 5 - 10%, Se: 0.001 - 0.1%, P: ≤ 0.1%, S: ≤ 0.3%, N: ≤ 0.1%, and a remainder of iron and unavoidable impurities, wherein the contents of Si, Cr, Cu, Mo, Nb, Ti, and V are to be added to the impurities with the proviso that the sum of the contents of impurities ≤ 3%. A flat steel product produced from such an alloy has pseudo-elastic properties, has a structure which consists of 50 - 70 percent by surface of austenite, 25 - 45 percent by surface of ferrite, and up to 5 percent by surface of martensite, and a remainder of deposits and other structure components, thus having a total restoring capability (GR) of at least 40%. The invention likewise relates to a method for producing such a flat steel product.