At one time there was some imported pure iron available in the US
-This seems to be no longer the case with reasonable prices. A high
grade product is available but should be costly from:
Pure iron is available from the UK:
Armco steel now AK makes enameling iron a very low carbon steel --
not really pure iron but very close with equal or lower carbon
content.. They may have made this in Middletown Ohio but but
probably rolled it in Butler Pa. I don't think they roll many
thicknesses any more but still roll some. for big customers --
getting small quantities may be difficult. See pdf for enameling
If you have someone nearby making porcelain enameled signs or
appliances nearby you may be able to buy some or find scrap .
Thompson enamels sells small pieces (but what is it really)-- I have
some but can't speak for it.