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Understanding Cast IronUnderstanding Cast Iron

Cast iron only cracks when it is stressed beyond its tensile strength. This includes all heat related cracks, freeze cracks, impact and bending loads. Cast iron does not weaken over time. It does change if exposed to high temperatures over long periods of time like exaust manifolds and wood burning stoves. The process is called graphitization. The carbon is changed to graphite and any type of welding that requires melting the cast iron becomes very dificult because the filler metal will not bond properly. Brazing is not affected because the iron is not melted during the process.  Click here to learn more