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All I've got for temp readout is two sensors at the top of the oven

I'm going to do a batch of 20 reheating to 900 to see what the torque test results are. They actually do get wet in a saline solution, but they are only used for a few seconds with torques in the inch-lb. level then discarded. So cracking hasn't been a problem at this time. For a bigger batch...

We recently heat treated a number of 17-4PH Cond A prototype parts in house to my H900 specification. The parts are 0.125" diameter and 6.25" long. They ran approximately 600 shafts of similar size range at the same time The guys stacked the shafts in a pile and ran the program for 1 hour at...