Iron+and+Steel

**__Iron__** Iron is a metal, that mixed with a lot of carbon can be used as a construction material. Iron can be molded to any shape and is strong in compression, but iron is expensive, heavy and weak on tension.

Steel is one of the strongest material used for construction. It's made with iron and a little bit of carbon. As iron, steel is heavy and expensive, it can rust and lose strength in high temperatures, but this material is strong in compression and tension.
 * __Steel__**

Corrugated iron is a building material composed of sheets of hot-dip galvanised mild steel, cold-rolled to produce a linear corrugated pattern in them.
 * __Corrugated Iron__**
 * What corrugated iron is?

Corrugated iron is lightweight and easily transported. It was and still is widely used especially in rural and military buildings, such as sheds and water tanks. Its unique properties were used in the development of countries like Australia from the 1840s, and it is still helping developing countries today. Corrugated iron was invented in the 1820's in Britain by Henry Palmer. It was originally made (as the name suggests) from wrought iron. It proved to be light, strong, corrosion-resistant, and easily transported, and particularly lent itself to prefabricated structures and improvisation by semi-skilled workers. It soon became a common construction material in rural areas in the United States, Chile and Australia and later India, and in Australia and Chile also became (and remains) the most common roofing material and is even used in urban areas (in which application it is usually painted) but not as commonly as in rural areas. For roofing purposes, the sheets are laid somewhat like tiles, with a lateral overlap of two or three corrugations, and a vertical overlap of about 150 mm, to provide for waterproofing. Corrugated iron is also a common construction material for industrial buildings throughout the world.
 * Characteristics
 * Uses through history

**__What it takes to be an iron worker__** An iron worker is the responsable for the construction of a building, a bridge, stairs, highways, an office, a factory... He's invloved in the whole construction process and he needs to have all the skils that this job requires. An iron worker must be in good physical conditions and and have an awesome strenght. He also needs corporal balance because this work is done at great heights and he should not be afraid of them.