Ferrous Alloys

Ferrous Alloys - FerrousAlloys Chapter12 oxide(rust ,but...

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    Ferrous Alloys Chapter 12
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Where Does Iron Come From? Naturally occurring iron exists as iron- oxide (rust) The iron in meteorites is metallic iron, but  there aren’t enough meteorites to supply  our iron needs
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Iron oxide is converted to iron in a blast  furnace
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Pig Iron Iron and several % Carbon
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Steel It wasn’t possible to make steel until  about 1850 An open hearth furnace is used to burn off  the excess carbon Carbon can also be burned off with Electric Furnace Oxygen Furnace
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Steel is a major structural  component
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Remember Steel generally has less than about 0.7%  C, but can have up to  2.11% C. Look at the iron phase diagram to remind  yourself why
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400 C 1400 C 1200 C 1000 C 800 C 600 C 1600 C Fe 1% C 2% C 3% C 4% C 5% C 6% C 6.70% C L γ α δ Steel Cast  Iron
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Steel and Iron Remember, the phase diagram only  strictly applies to an iron – carbon 
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Ferrous Alloys - FerrousAlloys Chapter12 oxide(rust ,but...

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