Chatlog+on+Iron+and+Steel

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 * José Isaias Borregales Reverón:** Hello!
 * gabrielajeu:** Hi!
 * Rebeca Malaver:** Hello José!
 * Rebeca Malaver:** Hello Gabriela!
 * Rebeca Malaver:** are you ready?
 * Rebeca Malaver:** what are the advantages of iron and steel over other materials?
 * José Isaias Borregales Reverón:** yes of course
 * José Isaias Borregales Reverón:** Provide far stronger and taller structures with less expenditure of material. And can produce greater unsupported spans over openings and interior or exterior spaces.
 * gabrielajeu:** Well, sometime ago I read that it gave us the possbility to reach for the Stars
 * Rebeca Malaver:** the iron and steel are materials stronger and has more compressive than tensile strength
 * gabrielajeu:** in other words, our buildings were more plastic. It gave us more to play with space
 * gabrielajeu:** What is the importance of steel and iron after the 20th. Century.?
 * José Isaias Borregales Reverón:** The evolution of steel frame construction in the 20th century entirely changed the concept of the wall and the support.
 * Rebeca Malaver:** after the 20th century they were used for bonding masonry
 * José Isaias Borregales Reverón:** but, What are the disadvantages of steel and what solutions have been found?
 * gabrielajeu:** Well, one of the disadvantage is the possibility of corrosion but nowadays they are some protections that fight against it
 * gabrielajeu:** and the is also Stainless steel. They have some kind of chemical inside of them that doesn´t let the material
 * gabrielajeu:** What are the characteristics of steel?
 * Rebeca Malaver:** hello again!
 * Rebeca Malaver:** The steel is strong, elastic and resistance.. this allows for tension, compression and bending
 * gabrielajeu:** great!
 * Rebeca Malaver:** now... What shapes are formed with steel?
 * José Isaias Borregales Reverón:** Plates, angles, I beams, and U-shaped channels
 * gabrielajeu:** that is the beauty of this material. It is malleable
 * Rebeca Malaver:** these parts are bolted or welded
 * José Isaias Borregales Reverón:** Yes, welding is the process of joining metals by melting the parts, The result is a rigid, continuous structure in which the joint is as firm as the member and which distributes stresses between beams and columns.
 * gabrielajeu:** Are aluminum and stainless steel heavy metal alloys?
 * Rebeca Malaver:** The aluminum is a light metal tha favored for exterior construction and that give resistance to the construction
 * gabrielajeu:** hey! I just read that stainless steel is, from these two, the only one that is an alloy. It is a combination of Iron, chromium, carbon, magnesium and othe elements in a small doses.
 * gabrielajeu:** Incredible, no?
 * Rebeca Malaver:** yes...
 * gabrielajeu:** well, I must go. Good Bye. Until Next time...
 * José Isaias Borregales Reverón:** bye
 * Rebeca Malaver:** bye.. see you