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Tempering 420F for Max. Tensile

Tempering 420F for Max. Tensile

Tempering 420F for Max. Tensile

(OP)
I am getting annealed 420F barstock for making turned parts.
Tempering at 600 F then air cooling produces a tensile of 230ksi according to Mark's Handbook. I plan on doing the tempering in house in a furnace with an inert atmoshere. Can someone tell me the duration of the heat treat at 600F? Part is 3/4" round.  

RE: Tempering 420F for Max. Tensile

Tempering is usually performed for 1 hour at the temperature specified for parts less than 25 mm (1 inch) thick.  You do realize that the tempering must be performed AFTER an austenitizing process (~ 980-1065 C or 1800-1950 F)?  Time at temperature for austenitizing is usually 30-90 minutes.

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