When I tried to make a banded mail suit of armor for the body location, I had 19 pieces of steel ore on the ground in front of the forge. When I attempted to craft, I got the following:
Suspecting this was just that the code was not recognizing I had 19 pieces strewn about the room, I picked one up and tried again:<100%hp 97m 100%mv> construct armor body steel 'banded mail' medium
You must have metal as a raw material to make a banded mail coat of plates.
So, assuming that you don't need to hold more than 6 steel ingots to craft, I suspect you need more than 19 to make a single banded mail coat? I have no way of verifying as the help files don't state how much of anything is required.<100%hp 97m 100%mv> get ingot
You get an average-grade ingot of steel.
<100%hp 97m 100%mv> construct armor body steel 'banded mail' medium
You don't have enough of an average-grade ingot of steel to make a banded mail coat of plates.