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I never noticed this before on OLM site but they call T651 'cold finish' & T6511 'extruded'. T651 goes for 69$/ft. T6511 goes for 44 $/ft. Since I'm after a 3" dia slug & will turn it down to 2.8"-ish is one alloy more referable over the other? (Crankcase related parts).
https://www.onlinemetals.com/merchant.cfm?id=1277&step=2&top_cat=60
https://www.onlinemetals.com/merchant.cfm?id=195&step=2&top_cat=60
I found the tempering properties here, but they don't really mention cold, finish, or extruded.
http://www.engineersedge.com/aluminum_tempers.htm
https://www.onlinemetals.com/merchant.cfm?id=1277&step=2&top_cat=60
https://www.onlinemetals.com/merchant.cfm?id=195&step=2&top_cat=60
I found the tempering properties here, but they don't really mention cold, finish, or extruded.
http://www.engineersedge.com/aluminum_tempers.htm
