In this environment, William Kelly devised a new process for ... its unique properties. Cast iron has a carbon content of 2-4%, making it hard, but brittle. Wrought iron is purest, with only 0.04-0.08 ...

For this purpose he subjects the cast iron vessels to a decarbonizing process, in the same manner that malleable iron is treated, by enclosing them in cases filled up with some decarbonizing agent ...

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Cast iron Brittle if thin ... Hard but brittle, less malleable than mild steel, good electrical and thermal conductivity Taps and tools, eg screwdrivers and chisels Low-carbon steel (mild steel ...