Just a note ; One time I bought some scrap that i figured was some kind of aluminun the customer did not know exactley what is was and niether did I so to be safe I bought as irony aluminum. these pipes were 5 inches in dia. and 3 ft. length and were really heavy. I'd never seen anything like it before. Much to my surprise at the yard the guy says oh yeah this is some hi-grade s. s. pipe for the food industy, that was when the market was high I had some 200 lbs of it.
Yeah it was a good paycheck that day. wb.