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Constructual Building Material
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Steelmaking involves the removal of iron's impurities and the addition of desirable alloying elements. Steel was first made by cementation, a process of heating bars of iron with charcoal so that the surface of the iron acquired a high carbon content.
The bars were then fused together, yielding a metal harder and stronger than the individual bars ....
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....smelting iron ore to produce usable metal is not known. The earliest iron tools found by archaeologists in Egypt date from about 3000 BC, and iron ornaments were used even earlier; the comparatively advanced technique of hardening iron weapons by heat treatment was known to the Greeks about 1000 BC.
The alloys produced by early iron workers, and, .... |
| Word count: 885 |
Page count: 4 |
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