Which statement about round bar formation is true?

Which statement about round bar formation is true?

• A. They can be formed only by hot rolling.
• B. They can be formed only by cold rolling.
• C. They can be formed hot rolled or cold rolled.
• D. They cannot be formed by rolling.

Answer: (C)

Round bar formation can be achieved through both hot rolling and cold rolling. Hot rolling is done above the material’s recrystallization temperature, allowing large deformation to create a round cross-section with a rough surface and looser dimensional tolerances. Cold rolling, or cold finishing, is performed near room temperature, which increases strength through work hardening and yields tighter tolerances and a smoother surface, though at higher cost and with size limitations. In practice, hot-rolled rounds are often cold-drawn to final dimensions, or some rounds are finished cold-rolled from hot-rolled stock. Because round bars can be produced by either method, this statement is true.