Material+review

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Steel Hello! Nice to meet you, thanks for invite me.
 * Hi! I’m Laura, welcome to our Material Review. I will make you some questions about steel. **

Steel is a construction material made of Iron with a touch (2% or less) of carbon. Adjusting the carbon content in me mixture of iron, we can changes the properties. Heat treating (mechanical working at cold or hot temperatures) or addition of alloying elements may also give superior properties.
 * 1. **** What is Steel? **

Steel is uniformly strong, elastic, and workable, and its high resistance in all stresses (tension, compression and bending) can be closely calculated. But it can loses strength in extremely high temperatures
 * 2. **** That’s interesting. Which are its properties? **

Steel can be use in structural cables in suspension bridges, trusses, beams and columns in skyscrapers. Its structural members are rolled in a variety of shapes, the commonest of which are plates, angles, I beams, and U-shaped channels.
 * 3. **** With all these properties, how many uses **** has the steel? **** and which are these uses? **

No, steel has different types, according the composition of the material.
 * 4. **** One type of steel has all these used? **

The three major classes are carbon steels, low-alloy steels, and high-alloy steels. Low-alloy steels are exceptionally strong and are used for machine parts, aircraft landing gear, shafts and in buildings and bridges. High-alloy steels offer unusual properties, for example Stainless steel. Making steel involves melting, purifying (refining), and alloying.
 * 5. **** How many types of steel exist? **

Stainless steel is a material made of Iron with more than 8% alloying elements. It is used primarily when corrosion or oxidation is a problem. The function that they perform cannot be duplicated by other materials for their cost.
 * 6. **** What is Stainless steel? **

Steel is obtained by refining iron or scrap steel by oxygen process, the open-hearth process, or in an electric furnace, then by removing excess carbon and impurities and adding alloying elements.
 * 7. **** But, how we obtain the different types of steel? **

Well… The steel produce a development of welding in the 20th century. All its structural members may be joined by steel bolts or rivets and it possible to produced fused joints with less labor and material. 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.
 * 8. **** Finally, what change produce Steel in the architectural technique? **


 * That’s very interesting, thanks for your time. **