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Adding carbon to iron to make steel does make it stronger and tougher, up to a point. Then it will get stronger but less tough (ie like cast iron). Carbon strengthens iron by distorting its crystal latice. This distortion is similar in effect to work hardening. It is unfortunately a very complex effect and depends on how the steel is heat treated and exactly what percentage of carbon is added (<4% by wieght normally). It is not true of all metals.