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Yes,many thanks to you both.

Alloy is 4330.The furnaces used for heat treat are equipped with recirc fans for even heating.Our rule of thumb is to temper 1hr per inch of thickness.My thinking is that this tube is 6" thick(subtracting the ID from the OD).Others say it"s 3"thick based on wall thickness.

Could someone direct me to resource to determine effective thickness of various geometric shapes?Currently we have alloy steel tubing 8" OD 2"ID x 20" long to quench&temper.Does it matter if the parts are processed laying down or stood up?Parts are rough machined so distortion not an issue.I...

Do you mean nitriding?

TY Metenqr.Problem is I get Rc 44 after a 600 deg. temper.I've been reading about sensitization of 300 series SS.Chrome-carbides forming at grain boundries.Does sensitization happen with martensitic SS as well?Would this be causing a rapid hardness drop as well as reduced corrosion resistance?I...

The example is about 200 lb batch of 1" dia pins processed in an IQ furnace.Tempers described are sequencial attempts to hit Rc 37-41.(customer spec.)

I find that Rc hardness drops rapidly when tempering 400 series SS between 950-1000 deg f.Why does this happen and how can it be avoided?A typical example is 416ss oil hardened from 1750f .15%C atmosphere requiring 37-41 Rc.1st temper @ 600f results in high hardness.2nd temper 2 hr @ 960f high...