A low alloy rotor steel is described which is substantially free of temper embrittlement within given constraints. In addition to describing the chemical composition there is included equations for predetermining the fracture appearance transition temperature of the unembrittled steel which equation permits the manufacturer to balance the alloying components within the ranges given in order to obtain a predetermined fracture appearance transition temperature, and by further balancing of the alloying components, the change in the fracture appearance transition temperature can be controlled to within .+-. 40F°. Drawings are included which graphically depict the area for control of the critical relationship between the molybdenum and the chromium.
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