hot rolled steel a steel that has been
roll pressed at very high temperatures
which is above the recrystallization
temperature for most steels this makes
the steel easier to form and resulting
in products that are easier to work with
to process hot rolled steel
manufacturers first start with a large
rectangular length of metal called a
village the billet is heated and then
sent for pre-processing where it is
flattened into a large role from there
it is kept in a high temperature and run
through a series of rollers to achieve
its finished dimensions the white-hot
strands of Steel are pushed through the
rollers at high speeds for sheet metal
rolled steel has spun into coils and
left to cool for other forms such as
bars or plates
the materials are sectioned and packaged
steel shrinks slightly as it cools since
hot rolled steel is cooled after
processing there is less control over
its final shape making it less suitable
for precision applications hot rolled
steel is often used in applications
where minutely specific dimensions
aren't crucial railroad tracks and
construction projects often use hot
rolled steel hot rolled products like
hot rolled steel bars are used in the
welding and construction trades to make
railroad tracks and i-beams for example
hot rolled steel is used in situations
where precise shapes and tolerances are
not required hot rolled steel typically
requires much less processing than cold
rolled steel which makes it a lot
cheaper because hot rolled steel is
allowed to cool at room temperature it's
essentially normalized meaning it's free
from internal stresses that can rise
from quenching or work hardening
processes hot rolled steel is ideal
where dimensional tolerances aren't as
important as overall material strength
then where surface finish isn't the key
concern where surface finish is a
concern scaling can be removed by
grinding sandblasting or acid bath
pickling once scaling has been removed
various brush or mirror finishes can
also be applied
descaled steel also offers a better
surface for painting and other surface
coatings when cooling steel after hot
rolling you should expect the steel to
shrink slightly you may find that you
have less control over the final size
and shape of your steel when using a hot
rolling method hot rolling however
allows steel to be formed into much
larger sizes than cold rolling cold
rolled steel is essentially hot rolled
steel that has been through further
processing once hot rolled steel has
cooled it is then rewrote at room
temperature to achieve more exact
dimensions and better surface qualities
cold rolled steel is often used to
describe a range of finishing processes
though technically cold rolled applies
only to sheets that undergo compression
between rollers steel forms that are
pulled such as bars or tubes are drawn
not rolled other cold finishing
processes include turning grinding and
polishing each of which is used to
modify existing hot rolled stock into
more refined products cold rolling
involves a similar process to hot
rolling
however the steel is subjected to
further processing after being rolled
the Steel's cooled at room temperature
and coal reduction Mills after the steel
has cooled it is subjected to a kneeling
and/or tempers rolling in order to
provide a wide range of surface finishes
and more accurate dimensional tolerances
cold rolled steel is often erroneously
used to refer to all products when the
product name refers specifically to flat
rolled sheep and coil products when
referring to bar products the process is
referred to as cold finishing a process
that instead involves called drawing
grinding and/or polishing generally
speaking cool treated steel metals of a
superior surface finish tolerance can
centricity and rigidity when compared to
hot rolled products when choosing
materials for a job it is important to
know the difference between the
different types of steel available how
it is used and the advantages of
including it in your industrial or
construction project actually loaders
produce all kind of roll forming machine
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