Jiho_Properties+and+Uses+of+Iron

__Properties of Iron__
Iron is generally described as a moderately heavy, hard malleable, and ductile metal. In its pure form, it has a silvery-white color. One of he most distinctive features is its ability to take ann retain a magnetic field. These metals have two incomplete electron shells. Iron has four allotropic forms. The alpha form is the most familiar because it is the one that exists at room temperture. As the temperture. As the temperture rises above 770`c, the beta form emerges. The most critical feature of theis particular transition is that the iron loses its magnetic preperties. Transitions to the gamma and selta forms take place at 928'c and 1530'c,respectively.

__Uses of Iron__
Iron is cheap to obtain, easy to shape and very strong. For all these reasons it is used more widely than any other metal.

From a ancient time, people used iron for halmet and other war supplies.

The world's first iron bridge, built across the River Severn in England in 1778, ushered in the new Iron Age

In the 19th century it became very fashionable to use cast iron as a decorative part of architecture. One of the world's most famous uses of for cast iron building is seen on these Sydney House

Steel is widely used in the construction industry, for example, in reinforced concerete buildings. Here the strength of the steel hekps to support the concrete.

Despite being constantly exposed to moisture, all ships and most containers, are still made from steel. This is because the cost of using other materials would be vastly greater.

Sreel (strong metal that can be shaped easily, consisting of iron and carbon) will take a cutting edge well and is the main material used of making chisels, saw blades, twist drills and other tools. Because it is not as hard as some other forms of steel, cutting tools will, however, require frequent sharpening.

One of the major steel used in the 19th century was railway lines. one quater of a million miles of track were laid at this time.

Steel is used as the body panels of almost all vehicles. It is a strong material, especially when formed into complex shaped, and it is relatively inexpensive. It can be formed into shpaes when cold.

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