I've been scrapping for about 10 years and here's what works for me and what I've learned:
I separate:
-316SS
-304 and other grades of SS (stainless steel)
-aluminum cans, foil, pie & baking tins
-cast aluminum (looks grainy, kind of like bronze water spigots)
-aluminum siding and gutters
-all other aluminum (shiny, tool handles, valve bodies, anything that does not fit any of the aluminum descriptions above)
** take all of the steel/iron out of the aluminum or the recycle center get ticked off and only pay .02 cents per pound to clean it up.***
- brass & bronze
- covered or shielded copper wire
- copper tubing and bare copper
- electric motors
- car/marine batteries
I do not recycle steel/iron due to price and the amount to make it worth my while. I only pick things from what people throw away if it catches my eye, I don't drive around every garbage night like some people. I also take the scrap from my work place, with permission.
If you want to know what your local scrap yards will accept and pay out, I would call them or go in and ask. Different companies pay out more or less even in the same area. plus some only take cans, others take everything.
I hope this helps, I'll try to find one of my older sheets to see what else is on it. I only go when I can fill up my truck, couple of times a year at the most.
Rumblebelly