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Q: Which of the following statements is INCORRECT regarding cold-rolled steel compared to hot-rolled steel?
  • A. For cold rolling, the metal should be at its re-crystallisation temperature.
  • B. Cold rolling increases yield strength.
  • C. Cold rolling increases hardness.
  • D. Cold rolling is cost effective.
Correct Answer: Option A - Compared to cold rolled sped, hot rolled steel offers a variety of advantages, such as- Greater strength- Cold rolled steel can exhibit strength upto 20% greater than that of hot rolled steel. Better surface finishes- Parts and products made from cold rolled steel generally have a smooth and shiny surface that is free of rust and scale. Higher precision- Unlike hot rolled steel, cold rolled steel does not shrink after the forming process.
A. Compared to cold rolled sped, hot rolled steel offers a variety of advantages, such as- Greater strength- Cold rolled steel can exhibit strength upto 20% greater than that of hot rolled steel. Better surface finishes- Parts and products made from cold rolled steel generally have a smooth and shiny surface that is free of rust and scale. Higher precision- Unlike hot rolled steel, cold rolled steel does not shrink after the forming process.

Explanations:

Compared to cold rolled sped, hot rolled steel offers a variety of advantages, such as- Greater strength- Cold rolled steel can exhibit strength upto 20% greater than that of hot rolled steel. Better surface finishes- Parts and products made from cold rolled steel generally have a smooth and shiny surface that is free of rust and scale. Higher precision- Unlike hot rolled steel, cold rolled steel does not shrink after the forming process.