DT Metals

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Ferrous metals

  • Contain iron
  •  Almost all ferrous metals are magnetic
  •  Disadvantage : they rust so a protective cover is essential
  • Stainless steel is a one form of a ferrous alloy
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Non-Ferrous metals

  • Contain NO iron
  • Do not rust and many don't need protective coating
  • Useful for jobs where metal may be in contact with moisture (garden furniture)
  • Can be expensive
  • Can have very versatile characteristics
  • Used in food containers and electrical equiptment

 

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Alloys

  • A metal combined with other substances to increase strength, ductility, durability and toughness.
  • The parent metal is the majority of the alloy.
  • Alloys are not just a mixture of metals, they can be a mixture of a metal and a non metal.
  • Unlike pure metals, alloys do not have a single melting point, they have a melting range.

ALLOYING AGENTS :

  • CHROMIUM -increases corrosion resistance. Increases hardness and tougness. Used in stainless steel in kitchen utensils and medical instruments.
  • VANADIUM - increases strength and toughness of steel including wear resistance. Used in surgical instruments.
  • NICKEL - increases strength, hardness and corrosion resistance. Used in engine parts and measuring tapes.
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Definitions

ALLOYS -  Metals formed by mixing a metal with another substance/substances (metal or non metal).

ORE - A solid, natural material from which metal can be extracted.

FERROUS - Group of metals that contain iron and varying amounts of carbon. Usually magnetic.

NON-FERROUS - Group of metals that do not contain iron.

PATINA - a thin coloured film that forms on the surface of some metals.

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