So if you get an ingot from another mod and place it before oredict has converted it to a Gregtech type you get an ingot of type item.mod.metal…name
for this example steel from immersive engineering’s blast furnace, gives an immersive engineering steel ingot which when placed give this ingot:
EDIT:
Interestingly it looks like it’s taken the immersive engineering ingot ID (4912 in this case) and applied the meta for steel onto it, giving 4912:8630 which doesn’t exist.