Iron+&+steel+page

**Cast iron:** It is iron mixed with Carbon
 * **Strengths:** It is very strong under compression, It is very castable to any shape.
 * **Weaknesses:** It is weaker than steel in tension. when the mateial is cold is weaker and migth be broken.
 * **Uses:** was used to make weapons like cannons, pots, bridges, columns and others.




 * Steel:** Steel is an alloy consisting mostly of iron, with a carbon content between 0.2% and 2.1% by weight, depending on the grade.


 * **Strengths:** It is one of the strongest materials used in construction, It is strong in compression and tension.
 * **Weaknesses:** It ruts and loses strenght in very high temperatures.
 * **Uses:** used widely in the construction of roads, railways, other infrastructure, and buildings. Most large modern structures, such as stadiums and skyscrapers, bridges, and airports, are supported by a steel skeleton

**Corrugated galvanised iron:** is a building material composed of sheets of hot-dip galvanised mild steel cold-rolled to have a linear corrugated pattern in them **Caracteristics:** CGI is lightweight and easily transported. It proved to be light, strong, corrosion-resistant, and easily transported, and particularly lent itself to prefabricated structures and improvisation by semi-skilled workers, available everywhere and is cheap

  The metals and thier alloys modified the world of construction, because they are very castables, resistant, easy to carrier than others materials like stone or wood, and also they are very commons in the nature. Today almost all the structure of building are made of metals, it gives strength and durability
 * Uses through history:** It was and still is widely used especially in rural and military buildings such as sheds and water tanks. farms ,also It is used as roofing material in urban areas.
 * What it takes to be an iron worker?**
 * Good physicals conditions and great strength
 * Balance
 * Not affraid highs
 * <span style="color: #0089ff; font-family: 'Comic Sans MS',cursive;">Good sight
 * <span style="color: #0089ff; font-family: 'Comic Sans MS',cursive;">They require to know about structural reinforcing, mathematics for welding and to read blueprints.


 * Metals timeline:**

<span style="color: #0078ff; font-family: 'Comic Sans MS',cursive;"> I will build a wall with bricks to hold the slope,so it should have strong piers. we need to be careful with the electricity wires which are crossing the road and with the bricklaying because this wall should be strong. just lets make it and we don't care about expenditures