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Look around you and you'll find examples of steel uses everywhere: in road, rail and bridge structures, food and beverage cans, construction elements such as reinforced concrete walls and pillars, bicycles, cars, trains, airplanes, and in a vast array of other products and appliances that make our lives easier. You'll find steel in furnishings (desks, filing cabinets, handles, hinges, locks and keys, light fittings, curtain rails, chair and table legs, etc.), office items (computers, paperclips, staples, diskettes...), personal accessories (glasses frames, watches, buttons, clasps, zippers, keyrings...) and household items (cutlery, sinks, saucepans and utensils, appliances), and it is prized by interior designers for use in modern furniture, lights and decorative elements or in motors, mobile phones, industrial machinery, flagpoles, lawnmowers.... it is impossible to imagine a world without steel.

Iron
i Symbol : Fe
ii Atomic Number : 26
iii Atomic Mass : 55.845 amu
iv Melting Point : 1535.0 °C (1808.15 K, 2795.0 °F)
v Boiling Point : 2750.0 °C (3023.15 K, 4982.0 °F)
vi Number of Protons/Electrons : 26
vii Number of Neutrons : 30
viii Classification : Transition Metal
ix Crystal Structure : Cubic
x Density @ 293 K : 7.86 g/cm3
xi Color : Silvery
Atomic Structure
i Number of Energy Levels : 4
ii First Energy Level : 2
iii Second Energy Level : 8
iv Third Energy Level : 14
v Fourth Energy Level : 2

Iron is the fourth most abundant element and makes up morethan five percent of the earth’s crust.  Iron exists naturally in iron ore (sometimes called ironstone). Since iron has a strong affinity for oxygen, iron ore is an oxide of iron minerals such as hematite and magnetite.; it also contains varying quantities of other elements such as silicon, sulphur, manganese, and phosphorus.

Smelting is the process by which iron is extracted from iron ore. At very high temperatures, a radical change takes place: the iron begins to absorb carbon rapidly, and the iron starts to melt.

Iron is the most widely used of all the metals, accounting for 95% of worldwide metal production. Its low cost and high strength make it indispensable in engineering applications. Steel is a metal composed of iron plus varying amounts of carbon as well as other elements such as chromium, nickel, molybdenum, zirconium, vanadium, tungsten, and so on. Different types of steel - that is, steel with different properties and characteristics - are produced by adjusting the chemical composition and adapting any of the different stages of the steelmaking process, such as rolling, finishing and heat treatment. As each of these factors can be modified, there is potentially virtually no limit to the number of different steels that can be made. Currently there are over 3,000 catalogued grades available (chemical compositions) of steel, not counting those created to meet custom demand, ranging from basic grades (such as for railway tracks, construction of machinery and machine tools, automobiles, the hulls of large ships, and structural components for buildings ) to sophisticated high-alloy and stainless grades for specialised applications.

Such as the Steel is durable and the most recycled material on earth.

The production of iron by humans began probably sometime after 2000 BC in south-west or south-central Asia, perhaps in the Caucasus region. Thus began the Iron Age, when iron replaced bronze in implements and weapons. This shift occurred because iron, when alloyed with a bit of carbon, is harder more