what is steel and why does steel rust ,type ,properties and uses

what is steel?Steel is alloy of iron and carbon containing less than 2% carbon and 1% manganese and small amounts of silicon, , sulphur, phosphorus and oxygen.

Steel is  most important
and valuable engineering and construction material. It is used in every phase of our lives; in car ,bikes and construction products, refrigerators and washing machines, cargo ships and surgical scalpels.
 why does steel rush Many materials and elements go through chemical reactions with other element. When steel comes into contact with water and oxygen there is a chemical reaction and the steel begins to revert to its original form -  iron oxide that is not good for steel.

In  modern steel application this problem is easily overcome by coating or painting. some different coating material can be applie to steel. Paint is used to coat car and bikes and enamel is used on refrigerators anand other domestic product. In other cases, elements such as chromium and nickel  are added to make stainless steel, which can help prevent rust.
Can steel be recycle but how?

Yes, it is very easily. Steel's unique  and good magnetic propertie make it an easy material to recover from the waste stream to be recycle. The properties of steel remain unchanged no matter how many times the steel is recycled.

   EAF (  electric arc furnace) method of steel production can use exclusively recycle steel. The blast furnace-basic oxygen furnace (BF-BOF) route can use up to 30% recycled steel.
MANY TYPE OF STEEL? Steel is not single product. There are more than 3,500 different grades of steel with many different physical, chemical,  properties.

ALMOST 75% of modern steels have been developed in the past 20 years. If the Eiffel Tower were to be rebuilt today, the engineers would only need one-third of the steel that was originally used.

Modern cars are built with new steels that are stronger but up to 35% lighter than in the past SO it is very good.
1.carbon steel
2.alloy steel
3.tool steel
4.Stainless Steels

properties and uses

Properties

As you no doubt know from having seen, heard and been in contact with your share of the stuff, steel is known foremost for its durability, hardness and toughness. In some cases, it is renowned for its shininess, too.

What these qualities translate to in quantifiable physical terms is a very high melting point (about 1,510 °C, higher than most metals; copper's, for example, is nearly 500 degrees cooler) and a very high density (7.9 g/cm3, almost eight times that of water).

Steel is harder and stronger overall than its so-called parent element, iron. Yet it is extremely flexible and known for its high tensile strength (i.e., its ability to withstand applied loads, or forces, without losing its shape).

The tensile strength of all types of steel is high compared to other materials but varies significantly between types of steel. At the low end, values are approximately 290 N/mm2; at the high end, tensile strength is as high as 870 N/mm2.

• One square millimeter (mm2) is only one-millionth of a square meter. This mean that steel can have a tensile strength of 870 million newton per square meter — equal to a mass of 88.8 million kilograms, or 195.7 million pounds (97,831 tons), on Earth!

If you have ever used a cast-iron skillet, you may have noticed how remarkably sturdy (or at least heavy) it seemed. When iron is the sole or nearly sole component of something like a pan, it is more brittle than steel.

But for most everyday cooking temperatures (which seem "hot," but are nowhere near smelting-furnace-like), the functional difference between iron and steel may not be readily apparent, even if they usually look somewhat different. 

use

• Steel is environment-friendly & sustainable. It posses great flexibility & durability.
• Compared to other materials, steel requires a low amount of energy to produce lightweight steel construction so economical good . 
• Steel is most recycled material which can be recycled very easily. Its  magnetic propertie make it an easy material to recover from stream to be recycled.
• Steel can be designed into various form. It gives better shape and size than iron which is used to make weapons.  .  
• Steel is good used in the automobile industry. Different types of steels are used in a car body, doors, engine, suspension, and interior. The average 50% of a car is made of steel thats good. 
• Steel reduces CO2 emissions.   
• Stainless steels are used to produce offshore platforms and pipelines and plates.  
• Steels are used for packaging and protecting goods from water, air and light exposure.  
• Most of the household product like fan  fridge, TV, oven, sinks, etc are made of steel.  
• Steels are used for producing industrial good like farm vehicle and machine. 
• Stainless steel is used as a cutlery material. 
• Because of its easily welding capability and attractive fi. 
• Stainless steel gives a hygienic environment. That’s why it is used for surgical implants. 
• Mild steel is used for building construction.