DT 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

• 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.