Q. what is steel?
Ans. Steel is an alloy of iron and carbon containing less than 1% manganese and 2% carbon and small amounts of silicon, sulphur, phosphorus and oxygen. Steel is the world’s most important construction and engineering material. It is used in every aspect of our lives: in cars and construction products, refrigerators and washing machines, cargo ships and surgical scalpels.

Q.what is stainless steel?
Ans.Stainless steel is an alloy of Iron with a minimum of 10.5% Chromium. Chromium produces a thin layer of oxide on the surface of the steel known as the ‘passive layer’. This prevents any further corrosion of the surface. Increasing the amount of Chromium gives an increased resistance to corrosion.Stainless steel also contains varying amounts of Carbon, Silicon and Manganese. Other elements such as Nickel and Molybdenum may be added to impart other useful properties such as enhanced formability and increased corrosion resistance.

Q.what are the different types of stainless steels are there?
Precipitation hardening (PH)

Q.what are the different types of steel are there?
Ans.According to the American Iron & Steel Institute (AISI), Steel can be categorized into four basic groups based on the chemical compositions:

Carbon Steel
Alloy Steel
Stainless Steel
Tool Steel

Q.can steel be recycled and reuse?
Ans.Yes, very easily. Steel’s unique magnetic properties make it an easy material to recover from the waste stream to be recycled. The properties of steel remain unchanged no matter how many times the steel is recycled.The electric arc furnace (EAF) method of steel production can use exclusively recycled steel.Steel is the world’s most recycled material.

Q.why does steel rust?
Ans.Many elements and materials go through chemical reactions with other elements. 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.In most modern steel applications this problem is easily overcome by coating. Many different coating materials can be applied to steel. Paint is used to coat cars and enamel is used on refrigerators and other domestic appliances. In other cases, elements such as nickel and chromium are added to make stainless steel, which can help prevent rust.

Q.can stainless steel rust?why?
Ans.Stainless does not “rust” as you think of regular steel rusting with a red oxide on the surface that flakes off. If you see red rust it is probably due to some iron particles that have contaminated the surface of the stainless steel and it is these iron particles that are rusting. Look at the source of the rusting and see if you can remove it from the surface. If the iron is embedded in the surface, you can try a solution of 10% nitric and 2% hydrofluoric acid at room temperature or slightly heated. Wash area well with lots and lots of water after use. Commercially available “pickling paste” can also be used. See “The Care and Cleaning of Stainless Steel” for more information.

Q.which company is the largest in the steel production?
Ans.worldsteel updates the list of top steel producers in the annual World Steel in Figures publication. For the latest table, visit the Online Bookshop.

Q.when was stainless steel was discovered ?
Ans.There is a widely held view that stainless steel was discovered in 1913 by Sheffield metallurgist Harry Brearley. He was experimenting with different types of steel for weapons and noticed that a 13% Chromium steel had not corroded after several months. However, the picture is much more complex than this.

Q.who invented stainless steel?
Ans.Harry Brearley

Q.What forms of corrosion can occur in stainless steels?
Ans.Pitting corrosion –
Crevice corrosion
General corrosion
Stress corrosion cracking (SCC)
Intergranular corrosion
Galvanic corrosion

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