1. 1. DIFFERENCE BETWEEN HOT & COLD ROLLED STEEL
2. 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. 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. 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. 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. 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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