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Which of the following material has the maximum carbon content?
1. Cast iron
2. Brass
3. Mild steel
4. Stainless steel

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Correct Answer - Option 1 : Cast iron

Explanation:

Cast iron 

  • It is an alloy of iron, carbon, and silicon and it is hard and brittle.
  • Carbon content in CI may be within 2% to 6.67% and carbon may be present as free carbon or iron carbide Fe3C.
  • In general, the types of cast iron are (a) grey cast iron and (b) white cast iron (c) malleable cast iron etc.

Brass

  • The brass alloy contains mainly copper (Cu) and Zinc (Zn). It is generally yellow in colour.
  • In brass, the quantity of zinc can vary from 5% to about 40%, and the amount of copper may range from 55% to 95% by weight.
  • Brass has a composition of 70% of copper and 30% Zinc.
  • Brass is not a good conductor of electricity. It is used in pipes and tubing, musical instruments, and decorative items etc.

Low Carbon Steel (Mild Steel):

  • Low carbon steel is an alloy of iron and carbon. The carbon content varies from 0.05 to 0.15 % for dead mild steel and 0.15 to 0.3 % for mild steel.
  • The dead mild steel is very much ductile and is used for making various components like sheets, strips, wires, rods etc.
  • The mild steel is soft and ductile. It is used for making various structural sections like angles, channels, beams, rods, pins, etc.

Medium carbon steel:

  • For medium carbon steel, the carbon percentage varies from 0.3 to 0.8%.
  • These steels have better strength and not very easy to shape as mild steel.
  • The hardness is slightly higher, and ductility is poor.
  • The machine parts requiring strength like springs, automobile parts, shafts, dies for forging etc. are made from medium carbon steel.

High Carbon steel:

  • The carbon percentage varies from 0.8 to 2%.
  • A high percentage of carbon gives hardness and strength to the metal.
  • It is mainly used for tools like chisels, hammers, dies, punches, broaches, reamers, drills, taps, etc. and the machine parts like springs, mandrels and similar parts requiring high strength and hardness.

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