I have a 6" OD x 1" wall x 95" lg aluminum (6061) tube that is used as part of our product. I am getting the tube in with a good deal of defects in the ID. There are axial grooves from the forming mandrel but also some craters roughly 1/2" to 1" in diameter. I desire a smooth bore, but do not want to bore such a long length. Is there an alternate mfg process that I can get from the mill to provide a smooth bore? What is the difference between "Extruded" and " Seamless" ( as they apply to tubing)? Thanks, Bill
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