A TEMPER EMBRITTLEMENTFREE LOW ALLOY STEELABSTRACT OF THE DISCLOSUREA low alloy rotor steel is described which issubstantially free of temper embrittlement within given con-straints. In addition to describing the chemical compositionthere is included equations for predetermining the fractureappearance transition temperature of the unembrittled steelwhich equation permits the manufacturer to balance the al-loying components within the ranges given in order to obtaina predetermined fracture appearance transition temperature,and by further balancing of the alloying components, thechange in the fracture appearance transition temperature canbe controlled to within ? 40F°. Drawings are included whichgraphically depict the area for control of the criticalrelationship between the molybdenum and the chromium.
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