Steels for cryogenic power engineering

1. The mechanical properties of the investigated steels at normal and cryogenic temperatures improve when their aluminum content increases to 10%. Further alloying with aluminum causes some impairement of the plastic and ductile properties; this is connected with the formation of α-phase in the structure of the steels. 2. Magnetic permeability is practically independent of the temperature in the range 293–4°K because of the complex magnetic transformations occurring during the freezing of steels. 3. When steels are deformed with e=40%, their texture is transformed, and this is accompanied by the displacement of the principal orientation of the texture from {110} to {110} . Such transformation leads to an anomalous decrease of magnetic permeability and electric resistivity of steels.