Bachelor of Technology Mechanical Industrial Materials UOG By:
Jahangir Rana
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Metals All metals belong to one of these two groups.
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Ferrous Metals Non-Ferrous Metals
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Ferrous metals Ferrous metals are metals, which are mainly made
of iron with small amounts of other metals or elements added in
order to give the correct properties. Almost all ferrous metals are
magnetic and can be picked up with a magnet. These metals rust or
oxidise if not treated as they contain iron.
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Non-Ferrous metals Non-Ferrous metals are those metals, which
do not contain iron. These metals are not magnetic and cannot be
attracted by a magnet. Examples of these are aluminium, copper,
lead, zinc and tin. These metals do not oxidise as they do not
contain iron.
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Ferrous Metals
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Mild Steel Composition -0.15 to0.30% carbon Properties- Tough,
high tensile strength, ductile. Because of low carbon content it
can not be hardened and tempered. It must be case hardened. Uses-
girders, Plates, nuts and bolts, general purpose.
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High Speed Steel Composition- medium carbon, tungsten, chromium
and vanadium. Properties - Can be hardened and tempered. Can be
brittle. Retains hardness at high temperatures. Uses- Cutting tools
for lathes.
High Tensile Steel Composition- Low carbon steel, nickel, and
chromium. Properties- Very strong and very tough. Uses- Gears,
shafts, engine parts.
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High Carbon Steel Composition- 0.70% to 1.40% carbon.
Properties- The hardest of the carbon steels. Less ductile, tough
and malleable. Uses- Chisels, hammers, drills, files, lathe tools,
taps and dies
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Medium Carbon Steels Composition- 0.30% to 0.70% carbon.
Properties- Stronger and harder than mild steels. Less ductile,
tough and malleable. Uses- Metal ropes, wire, garden tools,
springs.
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Cast Iron Composition- Remelted pig iron with small amounts of
scrap steel. Properties- Hard, brittle, strong, cheap, self-
lubricating. White cast iron, grey cast iron, malleable cast iron.
Uses- Heavy crushing machinery. Car cylinder blocks, vices, machine
tool parts, brake drums, machine handle and gear wheels, plumbing
fitments
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Non-Ferrous Metals
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Aluminum Composition- Pure Metal Properties- Grayish-White,
soft, malleable, conductive to heat and electricity, It is
corrosion resistant. It can be welded but this is difficult. Needs
special processes Uses- Aircraft, boats, window frames, saucepans,
packaging and insulation, pistons and cranks
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Aluminum alloys Composition- Aluminum +4% Copper+1%Manganese
Properties- Ductile, Malleable, Work Hardens Uses- Aircraft and
vehicle parts
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Copper Composition- Pure metal Copper+1%Manganese Properties-
Red, tough, ductile, High electrical conductor, corrosion
resistant, Can work hard or cold. Needs frequent annealing Uses-
Electrical wire, cables and conductors, water and central heating
pipes and cylinders. Printed circuit boards, roofs
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Brass Composition- 65% copper +35%zinc Properties- Very
corrosive, yellow in colour, tarnishes very easily. Harder than
copper. Good electrical conductor Uses- Castings, ornaments,
valves, forgings
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Lead Composition- Pure metal Properties- The heaviest common
metal. Soft, malleable, bright and shiny when new but quickly
oxidizes to a dull grey. Resistant to corrosion. Uses- Protection
against X-Ray machines. Paints, roof coverings, flashings
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Zinc Composition- Pure metal Properties- A layer of oxide
protects it from corrosion, bluish-white, easily worked Uses- Makes
brass. Coating for steel galvanized corrugated iron roofing, tanks,
buckets, rust-proof paints
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Tin Composition- Pure metal Properties- White and soft,
corrosion resistant Uses- Tinplate, making bronze
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Gilding metal Composition- 85% copper+15% zinc Properties-
Corrosion resistant, golden color, enamels well Uses- Beaten
metalwork, jewelry
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Pure metals and alloys All metals fall into two categories.
Pure metals Alloys.
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A pure metal consists of a single element, which means that it
is a metal only having one type of atom in it. The most commonly
used pure metals are Aluminium, Copper, Iron, Lead, Zinc, Tin,
Silver and Gold.
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An Alloy is a mixture of two or more pure elements. Pure metals
sometimes lack certain required properties. To create these
properties a number of these pure metals are combined
together.
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Pure aluminium is rarely used because it is too soft. It is
normally mixed with other metals, which produce aluminium alloys
that are even stronger than mild steel, are resistant to corrosion
but still retain the lightness of aluminium.