I see, but then wouldn’t cast iron (currently a valid material for the recipe) be also unsuitable for transformer cores? And according to those quora answers and wikipedia it’s not just “plain iron” but soft iron, which is annealed iron. In gregtech where there’s no real annealing process I guess that could just mean forcing use of wrought iron (which is not wrought either). Personally I would be fine with that since there is a real-life justification and it’s only a small hassle to keep some wrought iron plates around.
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