Annealing. As is generally true for all high-carbon steels, bar stock
supplied by mills in spheroidized condition. Annealed with structure of fine
spheroidal carbides in ferrite matrix. When parts are machined from bars
in this condition. no normalizing or annealing required. Forgings should
always be normalized. Anneal by heating to 800 “C (1475 OF). Soak
thoroughly. Furnace cool to 650 “C ( I200 “F), at a rate not to exceed 28 “C
(50 “F) per h. From 650 “C ( I200 “F) to ambient temperature, cooling rate
is not critical. This relatively simple annealing process will provide predominantly
spheroidized structure, desired for subsequent heat treating or
machining.
ln aerospace practice. parts are annealed at 815 “C (1500 “F) and
allowed to cool to below 510 “C (I000 “F)