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Re: Re: What's the difference between cast iron and steel ???
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Posted by ErnieD on October 18, 2001 at 17:37:29 from (24.169.120.133):
In Reply to: Re: What's the difference between cast iron and steel ??? posted by Jhill on October 18, 2001 at 13:13:28:
Close. In the blast furnace oxygen is injected to reduce the carbon to CO2 (the oxygen "oxidizes" the impurities). Its the carbon that makes cast iron brittle. Depending on the amount of carbon left and how it is cooled gives you various grades of steel. Martensite, austinite, and carbide are various forms of iron with varying amounts of carbon. Can't find my notes from 25 years ago, if you need more post back. The size of iron atoms and carbon atoms are different which creates stresses in the lattice. Also the carbon forms pockets of pure carbon or graphite. When you weld the expansion and contraction sets up fracture zones in the heated unheated boundaries. Steel is just the opposite, not brittle, reduced carbon, trace other metals for varying properties.
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