2. In the solution HT
condition, the casting is machined for mating surfaces, screw holes,
and the center channel, as shown in the picture to the right.
In the
annealed condition, 17-4PH has good machinability, similar to
that of 304 stainless steel.
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3.
After machining, the valve body is precipitation heat treated to
develop the desired microstructure, strength, and hardness at 896°F
(480°C) for 90 minutes with air cooling.
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