Transcript of Difference between hot and cold rolled steel
- 1. DIFFERENCE BETWEEN HOT & COLD ROLLED STEEL
- 2. HAVE YOU EVER WONDERED HOW RAIL TRACKS ARE MADE? OR HOW
SHEET METAL IS MADE WITH SUCH UNIFORM THICKNESS? SO, WHAT IS THE
DIFFERENCE BETWEEN HOT & COLD ROLLED STEEL?
- 3. HOT ROLLED STEEL THE PROCESS INVOLVES HEATING STEEL TO ABOVE
THE RECRYSTALISATION TEMPERATURE AND DEFORMED BETWEEN ROLLERS. Hot
rolling makes shaping and forming much easier, and it is even
typically cheaper and quicker to manufacture. However, hot rolled
steel shrinks during the cooling process, making the size and shape
less predictable.
- 4. APPEARANCE & USE: HOT ROLLED STEEL OFTEN HAS A ROUGH,
BLUE-GREY FINISH. Products produced by hot rolling are used in the
welding and construction trades to make items like rail tracks,
pipes, I-beams and guard rails, where exacting tolerances are not
required.
- 5. COLD ROLLED STEEL ROLLING AT ROOM TEMPERATURE, OR BELOW
STEELS RECRYSTALISATION TEMPERATURE, IS KNOWN AS COLD ROLLING. This
process actually increase strength by up to 20 per cent through
strain hardening. Cold rolled sheets can be worked into various
thicknesses, while shapes require sizing, roughing and
finishing.
- 6. APPEARANCE & USE: COLD ROLLED STEEL IS GREY IN
APPEARANCE AND IS SMOOTH TO THE TOUCH. Products commonly
cold-rolled include strips, sheets, bars and rods, which are
usually smaller than their hot rolled counterparts.
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