METAL PROPERTIES, CHAR, USES, AND CODES - OD1643 - LESSON 1/TASK 1
sulfurized ores, charlocite being the most important.
Copper is a
reddish metal, very ductile and malleable, and has high electrical
and heat conductivity. It is used as a major element in hundreds of
Chemically pure copper is not suitable for welding and,
while very soft, it is difficult to machine due to its high
(a) Uses. The principal use of commercially pure copper is in
the electrical industry where it is made into wire and other such
conductors. It is also used in the manufacture of nonferrous alloys
such as brass, bronze, and monel metal. Typical copper products are
sheet roofing, ammunition cartridge cases, bushings, wire, bearings
and ornamental statues.
(b) Capabilities. Copper can be forged, cast, and cold worked.
It can also be welded, but its machinability is only fair.
(c) Limitations.
Electrolytic
tough
pitch
copper
cannot
be
welded satisfactorily.
(5) Lead.
The chemical symbol for lead is Pb; it is extracted
from the material known as galena, the sulfide of lead.
Lead is a
heavy, soft, malleable metal, resistant to corrosion and particularly
effective against many acids.
(a) Uses.
Lead is used in the manufacture of electrical
equipment, such as lead-sheathed power and telephone cables and
storage batteries.
Many types of chemical compounds, such as lead
carbonate (paint pigment) and tetraethyl lead (antiknock gasoline)
are produced from lead.
(b) Capabilities.
Lead can be cast, cold worked, welded, and
machined.
(c) Limitations. Lead has low strength with heavy weight, and
lead dust and fumes are poisonous.
(6) Magnesium.
The chemical symbol for magnesium is Mg.
Its
principal ores are dolomite, magnesite, and carnallite, but it occurs
as magnesium chloride in certain natural salt brines and sea water.
(a) Uses. Magnesium is used as a deoxidizer for brass, bronze,
nickel, and silver.
It is used in commercial weight saving
applications such as
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