Extension to Angel's Smelting providing all metal mixing recipies to metallurgy (Brass, Bronze, etc) and compression on metal casting (eg. Iron Sheet) as well as casting gear wheels and pipes
With sheets, there is no point to do gears and such through smelting. I suggest you have a 10-20% yield increase by doing it through smelting, so instead of
40 molten iron -> 4 iron pipes
it is
100 molten iron -> 11 iron pipes
