- 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
- 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
- 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.
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.