Copper
Tubing, roofing copper.
Aluminum
Extrusions, structural, cutoffs, bumpers, rims, air conditioner coil, tank.
Stainless Steel
Need to be clean, separated by different grades.
Brass
Bare, pipes, heater cores
Alloys
Nickel, cobalt, titanium, tungsten
Others
Electric motors, radiators, compressors, clean turnings.