Steel

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Steel is an alloy of iron and a small amount of carbon. Carbon is the primary alloying element, and its content in the steel is between 0.002% and 2.1% by weight. The material is significantly hardened and strengthened by impurities, such as carbon, from the smelting process. A certain proportion of carbon (between 0.002% and 2.1%) produces steel, which may be up to 1000 times harder than pure iron. Iron metal has been used since ancient times, though copper alloys, which have lower melting temperatures, were used first in history. Additional elements may also present in steel: manganese, phosphorus, sulfur, silicon, and traces of oxygen, nitrogen and aluminium. 

Meteoric iron is a native metal found in meteorites and made from the elements iron and nickel mainly in the form of the mineral phases kamacite and taenite. Kamacite and Taenite are the principal iron-nickel alloy minerals in iron meteorite. Meteoric iron makes up the bulk of iron meteorites but is also found in other meteorites. Apart from minor amounts of telluric iron, meteoric iron is the only naturally occurring native metal of the element iron on the Earth's surface.

The Iron Plate in the Great Pyramid

A sample of a melted iron made of Asmar, Mesopotamia and Tall Chagar Bazaar in northern Syria, 2700 -300 years before the time. 

23.9.2015*21:50 (9668 - 9666)
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