alloy iron
and carbon which melted airtight crucibles and then poured into
moulds form ingots.
Mild steel
Mild steel also alloy iron and carbon but contains much less car-
bon than cast steel. These ingots are then rolled pressed into vari-
ous shapes from which the finished products are made. moist conditions corrosion takes place rapidly unless the metal is
protected. good
conductor and highly resistant corrosion. Mild steel the most widely used metal the world, having
considerable strength and rigidity without being brittle. Because
it harder than copper aluminium easily machined.
Zinc
Zinc non-ferrous metal which used mainly protect steel against
corrosion and making the alloy brass. Cast steel can be
hardened and tempered and therefore ideal for manufacturing tools.
Cast steel
Cast steel also called tool steel high-carbon steel. For these reasons often
used the electrical and plumbing trades. The combined properties being attractive
metal which highly resistant corrosion make popular metal for
ships’ furnishings.
Brass attractive yellow metal which also used for decorative house-
hold articles and jewellery. Ships, bridges,
girders, motorcar bodies, bicycles, nails, screws, conduit, trunking, tray
and SWA are all made mild steel. can filed, drilled sawn quite easily and may
be bent when hot cold, but repeated cold bending may cause frac-
ture.Basic Electrical Installation Work
102
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Materials
List 5‘good insulator’materials being used your place work.
Hammer heads, pliers, wire cutters, chisels, files and many machine parts
are also made from cast steel.
Brass
Brass non-ferrous alloy copper and zinc which easily cast.
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Materials
List 5‘good conductor’materials being used your place work. Mild steel coated with zinc is
sometimes called galvanized steel, and this coating considerably improves
. Taps, valves, pipes, electrical
terminals, plug top pins and terminal glands for steel wire armour (SWA)
and cables are some the many applications
