Hot rolling, the process used to make hot rolled steel, involves rolling steel at high temperatures (typically over ˚F). These high temperatures are above steel&#;s recrystallization temperature, allowing the steel to be easily shaped, formed, and made in larger sizes. As it cools, hot rolled steel tends to shrink non-uniformly, giving less control on the size and shape of the finished product when compared to cold rolled steel.
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Hot rolled steel tends to have a scaly finish which can be removed by pickling, grinding, or sand-blasting. This steel is essentially normalized, meaning free from internal stresses that can arise from quenching or work-hardening processes, because it is allowed to cool at room temperature. Other properties may include:
Hot rolled steel tends to be cheaper than cold rolled steel because it is manufactured without any delays in the process and does not require reheating like cold rolled steel. It is also essentially normalized as it is allowed to cool at room temperature; this means it&#;s free from internal stresses that can arise from quenching or work-hardening processes.
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One of the many differences between hot and cold rolled steel is price. Hot rolled steel tends to be cheaper than cold rolled steel because it is manufactured without any delays in the process and does not require reheating like cold rolled steel. It can be used in applications where precise shapes and tolerances are not required, such as:
What Matt said. HRPO is the way to go.
You wouldn't want cold rolled even if it was the same price as hot rolled. CR steel has extreme levels of compressive stress locked in near its surface due to the rolling process. Heating one surface to any appreciable degree relieves those stresses on that side. The imbalance of stress then causes the material to warp. HR doesn't have those compressive stresses because the elevated temperature of the steel during rolling allows it to remain in the annealed state.
A good while back, pickling and oiling added about 5¢/lb to the cost of HR plate. Could be as much as a dime now, but that's still cheap compared to the premium for CR which typically runs about twice the price of HR.
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