A search of minimum temperature of melt heating facilitating considerable improvement of amorphous strip preperties, has been conducted. And the pact was used that the polytherms of physical properties melt have hysteresis, that is the values of parameters have discrepancies at heating and cooling, above the specific temperature tK, called the temperature of structural transformation. Made mechanical and magnetic characteristics of amorphous strip, produced after the heating of molten metal above and Below tK, have been compared. It is shown that using the liquid metal heating above the temperature, at which the change in FeBSiC melt structures are observed, a thicker amorphous strip with good mechanical properties can be obtained. The structure of the strip obtained has a greater disorder in atom arrangement.