We have a tubular structure made from 0.050" wall 1.5" diameter 17/7 tubing that is 14 ft long x 2 ft x 2 ft that requires heat treat to TH1050. We have determined vacuum heat treat is not necessary and our customer is now thinking that the full UTS and YS is not a necessity. Part of the expense we are considering the need for is the cooling to 60 deg F in one hour after the austenitizing (1400 deg F) stage. The heat treat companies I contacted don't have a good way to do this for so large a structure. In that the structure is primarily 0.050" wall tubing, if the heat treat company cooled with forced air or compressed air and the time to get to 60 deg F was longer, say 2 hours, what affect would that be to the YS and UTS? Can anyone give me some information on the expected YS and UTS in relation to the cool time?
Any input would be appreciated.
Kim Taylor PE
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