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The different types from steel are grouped in five main classes:
Carbon steels. More of 90% of all steel they are carbon steels. These steel less
contain diverse amounts of carbon and of 1.65% of manganese, 0.60% of silicon
and 0.60% of copper. Between products made with carbon steels they appear
machines, bodies of automobile, most of the structures of construction of steel,
ship's hulls, somieres and brackets or pins for the hair.
Resistant extreme low alloy steels. This family is most recent of the five
great steel classes. The low alloy steels are cheaper than alloy steels
conventional since they contain smaller amounts of the expensive alloy elements.
Nevertheless, they receive a special treatment that gives a resistance them much
greater than the one of the carbon steel. For example, the wagons of merchandise
made with low alloy steels can transport greater loads because their walls are
thinner than what would be necessary in case of using carbon steel. In addition,
as the low alloy steel wagons weigh less, the loads can be heavier. At the
present time many buildings with steels of low alloy are constructed. The beams
can be thinner without diminishing their resistance, obtaining a greater near
space in the buildings.
Stainless steel. The stainless steel contain chromium, nickel and other
alloy elements, that maintain brilliants to them and resistant to oxidation in
spite of the action of the humidity rusts and or corrosive acids and gases. Some
stainless steel are very hard; others are very resistant and maintain that
resistance during long periods to extreme temperatures. Due to his shining
surfaces, in architecture they are often used with decorative aims. The
stainless steel is used for the pipes and tanks of petroleum refineries or
chemical plants, for the fuselages of the airplanes or space capsules. Also it
is used to make instruments and surgical teams, or to fix or to replace broken
bones, since it resists to the action of the corporal fluids. In kitchens and
zones of food preparation the utensils are often of stainless steel, since it
does not darken foods and can be cleaned with facility.
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