http://www.steel.org/AM/Template.cfm?Section=How_Steel_is_Made&Template=/TaggedPage/TaggedPageDisplay.cfm&TPLID=36&ContentID=8213
hope this helps you.
2007-03-10 08:03:45
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answer #1
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answered by I know, I know!!!! 6
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Iron ore is ehated in presence of carbon, the carbon takes away the oxygen from the iron wich gets reduced and turned to liquid metal, while the oxidized carbon flows off as carbon dioxide gas. Then, whatever excess carbon left is also attacked by injecting oxygen under pressure, leaving a mix of iron and carbon that is the base of cast iron or carbon steel (depending how much carbon is left). Then other elements are added, such a chromium, vanadium, manganese, nickel, etc, depending on the type of steel needed.
Once cast, there are plenting of other treatment than can be done to further control the desired characteristics of the final product, like quenching, annealling, cold forming, etc.
2007-03-10 16:08:34
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answer #2
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answered by Vincent G 7
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The basic oxygen steel-making process is as follows:
1. Molten iron from a blast furnace is poured into a large refractory-lined container called a ladle;
2. The metal in the ladle is sent directly for basic oxygen steelmaking or to a pretreatment stage. Pretreatment of the blast furnace metal is used to reduce the refining load of sulphur, silicon, and phosphorus. In desulphurising pre treatment, a lance is lowered into the molten iron in the ladle and several hundred kilograms of powdered magnesium are added. Sulphur impurities are reduced to magnesium sulphide in a violent exothermic reaction. The sulphide then raked off. Similar pretreatment is possible for desiliconisation and dephosphorisation using mill scale(iron oxide) and lime as reagents. The decision to pretreat depends on the quality of the blast furnace metal and the required final quality of the BOS steel.
3. Filling the furnace with the ingredients is called charging. The BOS process is autogenous: the required thermal energy is produced during the process. Maintaining the proper charge balance, the ratio of hotmetal to scrap, is therefore very important. The BOS vessel is one-fifth filled with steel scrap. Molten iron from the ladle is added as required by the charge balance. A typical chemistry of hotmetal charged into the BOS vessel is: 4% C, 0.2-0.8%Si, 0.08%-0.18%P, and 0.01-0.04%S.
4. The vessel is then set upright and a water-cooled lance is lowered down into it. The lance blows 99% pure oxygen onto the steel and iron, causing the temperature to rise to about 1700°C. This melts the scrap, lowers the carbon content of the molten iron and helps remove unwanted chemical elements. It is this use of oxygen instead of air that improves upon on the Bessemer process, for the nitrogen (and other gases) in air do not react with the charge as oxygen does.
5. Fluxes (burnt lime or dolomite) are fed into the vessel to form slag which absorbs impurities of the steelmaking process. During blowing the metal in the vessel forms an emulsion with the slag, facilitating the refining process. Near the end of the blowing cycle, which takes about 20 minutes, a the temperature is measured and samples are taken. The samples are tested and a computer analysis of the steel given within six minutes. A typical chemistry of the blown metal is 0.3-0.6%C, 0.05-0.1%Mn, .01-0.03%Si, 0.01-0.03%S and P.
6. The BOS vessel is tilted again and the steel is poured into a giant ladle. This process is called tapping the steel. The steel is further refined in the ladle furnace, by adding alloying materials to give the steel special properties required by the customer. Sometimes argon or nitrogen gas is bubbled into the ladle to make sure the alloys mix correctly. The steel now contains 0.1-1% carbon. The more carbon in the steel, the harder it is, but it is also more brittle and less flexible.
7. After the steel is removed from the BOS vessel, the slag, filled with impurities, is poured off and cooled.
2007-03-10 16:04:01
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answer #3
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answered by Anonymous
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1 cup of tin foil
2 teaspoons of coins
1 pinch of steel wool
1/2 cup of zip-lock sandwich baggies
1/2 cup of unsalted butter
pinch of love (this is my grandma's recipe)
1 saltine cracker
Preheat oven to 800 degrees.
In a medium-size bowl, mix the tin foil, coins, and steel wool. On the pot, melt the butter, pinch of love and saltine cracker. Pour butter ingredient into the dry mixture (goggles are needed from now on). With a strong blender, beat the ingredients together. Pour into a cast iron bowl and place into the over. Let cook for 23 hours or until the mixture is red.
2007-03-10 16:08:22
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answer #4
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answered by Nick Y 2
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Melt iron ore. Remove the slag from the top. Add up to .2 % carbon and you have iron.
2007-03-10 16:12:27
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answer #5
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answered by radar 4
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it's an alloy made up of iron and carbon melted together... good old andrew carnagie..
2007-03-10 16:03:20
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answer #6
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answered by Anonymous
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Here:
2007-03-10 16:03:15
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answer #7
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answered by Dan821 4
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