Temper embrittlement free low alloy steel

C - Chemistry – Metallurgy – 22 – C

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C22C 38/08 (2006.01) C22C 38/44 (2006.01)

Patent

CA 1059798

A TEMPER EMBRITTLEMENT FREE LOW ALLOY STEEL ABSTRACT OF THE DISCLOSURE A low alloy rotor steel is described which is substantially free of temper embrittlement within given con- straints. 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 al- loying 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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