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5.1_Metals%20rev - Division 5 – Metals History –...

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Unformatted text preview: Division 5 – Metals History – Everyone’s favorite Pure iron (ferrous metal) is weak. Wrought-iron (fences, Eiffel tower) – Nearly pure, but strong enough for construction. In steel, strength and hardness comes from carbon (if carbon is < 1.2%) Cast-iron (pots) – Greater than 1.2 % carbon, making cast-iron hard & brittle. Modern Steel – Benjamin Huntsman in 1730’s. What did he invent???? Bessemer process – 1860’s – 1 st high-tonnage steel making process. Uses forced air to burn out impurities and manganese for chemical reaction to convert iron to steel. For test, know the other term for “forced air” from the book. Raw Materials for Iron Making Iron Ore – Great Lakes, Alabama, NJ, NY, California Fuels – Coal, Oil, or Natural Gas. For test, which fuel is used most often? Fluxes – Minerals that combine with impurities in iron ore for easy separation. Refractories – Used as linings of steel making equipment. Properties include superior heat and abrasion resistance. Smelting – Heating of ore to remove impurities. Iron to Steel For the test, read in the textbook and know the steps for transforming iron to steel: Mining Processing Pellets (Iron Ore) Coke (Coal) Flux (Purifiers) Smelting Refining – Chemical Balancing/Heat Carbon, Silicon, Sulfer, Phosphorus, and Manganese Steelmaking Lowering carbon levels in pig iron, controlling impurities, and adding alloying elements....
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5.1_Metals%20rev - Division 5 – Metals History –...

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