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Constructual Building Material - School Essays

Constructual Building Material

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 but lacking uniformity in these properties. The crucible method, consisting of melting iron together with other substances in a crucible, is one of the costlier steelmaking processes, employed only for making special steels (e.g., the famous blades of Damascus). Steel is often classified by its carbon content: a high-carbon steel is hard and ...

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tensile strength and resists abrasion and corrosion because of its high chromium content. It is used in kitchen utensils, plumbing fixtures, piping for industrial plants, architectural decoration, and other applications where durability is
The exact date at which people discovered the technique of 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, indeed, all the iron alloys made until about the 14th century AD, would be classified today as wrought iron. They were made by heating a mass of iron ore and charcoal in a forge or furnace having a forced draft. Under this treatment the ore was reduced to the sponge of metallic iron filled with a slag composed of metallic impurities and charcoal ...

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Added: 4/12/2004 07:11:19 AM
Category: Miscellaneous
Type: Premium Paper
Words: 885
Pages: 4

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