Metals

1
Metals

• There are two types of metals
• Ferrous (contain iron)
• Non- Ferrous (do not contain iron)

2
Ferrous Metals
All the metals in this group contain Iron. They
include wrought iron, mild steel and cast steel.
Ferrous metals rust easily when exposed to the
atmosphere and are magnetic.
Plain Carbon Steels Alloy Steels
3
Plain Carbon Steels
These steels are a series of iron and carbon
alloys with carbon content varying between 0.05
and 1.4
Dead mild Steel

• Low carbon content 0.05-0.15.
• Ductile and easily formed
• Uses chains, rivets, nails, thin wire

4
Mild Steel

• carbon content 0.15-0.30.
• Bright mild and Black mild, Bright mild used in
  benchwork Black mild used for forging
• Ductile, easily cut, machined and welded, cannot
  be hardened or tempered
• Uses General engineering work, girders, plates
  for ship building, gates.

5
Medium Carbon Steel

• carbon content 0.30-0.60.
• Greater strength than mid steel but not as
  ductile or malleable.
• Uses Axles, rail tracks,spades wire ropes..

6
High Carbon Steel (Cast Steel)

• carbon content 0.6-1.4.
• Hard and wear resistant can be hardened and
  tempered.
• Uses Cutting tools (chisels, saws, files) dies
  punches springs hammers..

7
Silver Steel

• carbon content _at_ 1.0, contains chromium
• Does not contain silver gets its name from
  appearance
• Uses Scribers and screwdriver heads.

Tool Steel

• Used for making engineering tools.

8
Tinplate

• Tinplate is produced by coating thin sheets of
  steel containing 0.1 carbon with Tin.
• The process of coating the steel is called
  Electro-plating.
• Uses for food containers. It is also used as
  containers for many other products such as paint,
  lubricants etc.

9
Galvanised Iron

• This is mild steel coated with Zinc.
• The coating is usually achieved by dipping the
  steel article in a bath of molten zinc.
• Uses for roof sheeting, gates, water tanks,
  dust bins and other outdoor articles.

10
Alloy Steels
These steels are produced from adding elements
such as chromium, tungsten, nickel and manganese
to steel.