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==Sorenson: "By 1400 BC, smiths in Armenia had discovered how to carburize iron by prolonged heating in contact with carbon"== | ==Sorenson: "By 1400 BC, smiths in Armenia had discovered how to carburize iron by prolonged heating in contact with carbon"== | ||
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[[es:Fuente:Sorenson:JBMS 15:2:Por el año 1400 aC, herreros en Armenia habían descubierto cómo carburar el hierro por calentamiento prolongado en contacto con el carbono]] | [[es:Fuente:Sorenson:JBMS 15:2:Por el año 1400 aC, herreros en Armenia habían descubierto cómo carburar el hierro por calentamiento prolongado en contacto con el carbono]] | ||
[[pt:Fonte:Sorenson:JBMS 15:2:Por volta de 1400 aC, ferreiros em Armênia tinha descoberto como cementação ferro por aquecimento prolongado em contato com o carbono]] | [[pt:Fonte:Sorenson:JBMS 15:2:Por volta de 1400 aC, ferreiros em Armênia tinha descoberto como cementação ferro por aquecimento prolongado em contato com o carbono]] | ||
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John L. Sorenson: [1]
Steel is "iron that has been combined with carbon atoms through a controlled treatment of heating and cooling." [2] Yet "the ancients possessed in the natural (meteoric) nickel-iron alloy a type of steel that was not manufactured by mankind before 1890." [3] (It has been estimated that 50,000 tons of meteoritic material falls on the earth each day, although only a fraction of that is recoverable.) [4] By 1400 BC, smiths in Armenia had discovered how to carburize iron by prolonged heating in contact with carbon (derived from the charcoal in their forges). This produced martensite, which forms a thin layer of steel on the exterior of the object (commonly a sword) being manufactured. [5] Iron/steel jewelry, weapons, and tools (including tempered steel) were definitely made as early as 1300 BC (and perhaps earlier), as attested by excavations in present-day Cyprus, Greece, Turkey, Syria, Egypt, Iran, Israel, and Jordan. [6] "Smiths were carburizing [i.e., making steel] intentionally on a fairly large scale by at least 1000 BC in the Eastern Mediterranean area." [7]
Notes
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