Demetria Devonne "Demi" Lovato (born August 20, 1992) is an American recording artist, actress, and philanthropist. She made her debut as a child actress in Barney & Friends. In 2008, she came to prominence as a starring cast member in the television film Camp Rock. She signed to Hollywood Records the same year, and released her debut studio album, Don't Forget, in September 2008. The album sold 89,000 copies in its first week, debuting at number 2 on the Billboard 200. It has since been certified Gold by the Recording Industry Association of America for sales of over 530,000. In 2009, Lovato was commissioned her own television series, Sonny with a Chance. That July, her second album, Here We Go Again, became her first to debut atop the U.S. Billboard 200, selling 108,000 copies in its first week and spawning the single of the same name which became her first to break the top 20 of the Billboard Hot 100, peaking at number 15.
We know stainless steel, low-carbon steels, medium-carbon steels, high-carbon steels and tool steel (silver steel).
Where are they used?
They are used in manufacturing parts and machines for various industries.
5. What gives the addition of manganese, silicon and chromium to steel?
Manganese gives extra strength and toughness. Steel containing 4 per cent silicon is used for transformer cores or electromagnets. The addition of chromium gives extra strength and corrosion resistance.
6. What can be made of mild steels (medium-carbon steels, high-carbon steels)?
Low carbon steels are used in the manufacture of sheet iron, wire, and pipes. Medium-carbon steels are used as structural steels. Both mild and medium-carbon steels are suitable for forging and welding. High-carbon steels are used in cutting tools, surgical instruments, razor blades and springs.
7. What kind of steels can be forged and welded?
Mild and medium-carbon steels are suitable for forging and welding.
8. How can we get rust-proof (stainless) steel?
We can get rust-proof steels by adding chromium to steel.
9. What is used to form a hard surface on steel?
Heating in the presence of carbon or nitrogen-rich materials is used to form a hard surface on steel.
10. What are high-speed steels alloyed with?
High-speed steels are alloyed with chromium and tungsten plus smaller amounts of vanadium, molybdenum and other metals.
1. What is steel?
Steel is an alloy of iron and carbon.
2. What are the main properties of steel?
Steel is strong and stiff.
3. What are the drawbacks of steel?
Steel corrodes easily through rusting.
4. What kinds of steel do you know?
We know stainless steel, low-carbon steels, medium-carbon steels, high-carbon steels and tool steel (silver steel).
Where are they used?
They are used in manufacturing parts and machines for various industries.
5. What gives the addition of manganese, silicon and chromium to steel?
Manganese gives extra strength and toughness. Steel containing 4 per cent silicon is used for transformer cores or electromagnets. The addition of chromium gives extra strength and corrosion resistance.
6. What can be made of mild steels (medium-carbon steels, high-carbon steels)?
Low carbon steels are used in the manufacture of sheet iron, wire, and pipes. Medium-carbon steels are used as structural steels. Both mild and medium-carbon steels are suitable for forging and welding. High-carbon steels are used in cutting tools, surgical instruments, razor blades and springs.
7. What kind of steels can be forged and welded?
Mild and medium-carbon steels are suitable for forging and welding.
8. How can we get rust-proof (stainless) steel?
We can get rust-proof steels by adding chromium to steel.
9. What is used to form a hard surface on steel?
Heating in the presence of carbon or nitrogen-rich materials is used to form a hard surface on steel.
10. What are high-speed steels alloyed with?
High-speed steels are alloyed with chromium and tungsten plus smaller amounts of vanadium, molybdenum and other metals.