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Herald of Steel - Chapter 301 Bessemer Converter
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... iron with 4% - 4.5% carbon, which was also called pig iron because the originally, the cooled large, central, and adjoining smaller ingots resembled a sow and suckling piglets
This pig iron had too much carbon content to be made into anything useful and so had to have its carbon content and other impurities reduced.
In the current timeline, this was done by repeatedly hammering the iron and thus literally beating the impurities out of it in the form of slag.
While in Alex ...
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