Iron+and+steel

=**“the old cast iron buildings died out. I'm not really sure whether the new skyscrapers killed** **them, or the new esthetics”**=

On my opinion, it wasn’t the fault of new constructions like skyscrapers or the new trends in fashion or architectural design that “kill” cast iron use. It was the result of a process in the engineering and architectural improvements on construction.People, who discover cast iron by first time, were really impressed by the wonderful properties of this material, so they start building all kind of structures with it. But, due to an accidentally fire event on Chicago, people start thinking in a new material for construction that could be stronger than iron. At this moment Steel properties were discovered and it became the most useful, strong and versatile material at construction just our days.

Cast Iron is brittle, it snaps very easily. Cast Iron is strong in compression, therefore old arch bridges were made of cast iron. Cast Iron is very flexible. Cast Iron is very weak in tension. Cast Iron is very heavy. Cast iron is used in arch bridges, cannons, historic domes. Steel is stronger than any material in tension, therefore the cables in the Golden Gate Bridge were made of steel. Steel is stronger than any material in compression, therefore steel supports most skyscrapers. Steel is very heavy. It is one of the strongest materials used in construction. It rusts and loses strenght in high temperatures. It is used in bridges, trusses, beams and columns and roller coasters.
 *  Iron-Steel **

‍**Find the meaning of "Wrought Iron" and its uses.** Wrought Iron is a term that can be discomposed into two words. The word “wrought” is a very old way of referring to the verb “to work”, so the term Wrought Iron really and literally means worked iron which means that the iron is mixed with slag and other impurities. Because it is relatively brittle cast iron, it has relegated the use of this material to secondary o decorative uses in construction, such as railings and other parts. I believe the metal, more that a cold material is a good conductor of heat, that is, metal can easily acquire warmth of another body by contacting, to achieve a balance between the temperatures of the two bodies.
 * <span style="font-family: 'Arial','sans-serif';">Do you think metals are "cold" materials? **