Difference Between Hot Rolling and Cold Rolling

Many customers often ask us the difference between hot rolled steel and cold rolled steel. Fundamentally, there are some differences between these two metals. The difference has nothing to do with product specification or grade, but with the way, the factory processes these metals.

If the temperature of the metal is above its recrystallization temperature (over 1700 degrees Fahrenheit), the process is called hot rolling. At this temperature, steel can be easily shaped and shaped and can be made to larger sizes. Generally, hot rolled steel is cheaper than cold rolled steel because it is usually manufactured without any processing delay. Hot-rolled production lines, such as rebar production lines, angle steel production lines, deformed bar production lines, remanufacturing of scrap steel bars, hot rolling steel bar, angles are generally used in welding and construction industries, such as the manufacture of rails and I-beams. Hot rolled steel is used when precise shapes and tolerances are not required.

If the temperature of the metal is below its recrystallization temperature, the process is called cold rolling. Essentially, cold-rolled steel is hot-rolled steel that has been further processed. Steel is processed in a cold rolling mill, where the material is cooled (at room temperature) and then annealed and rolled. The process will produce steel with tighter dimensional tolerances and a wider range of surface finishes. Such as round steel sheets, strip steel, etc. Cold rolled steel is limited to a few shapes such as round, square, flat, and various shapes of these types.

Here are some videos of our products for your understanding and reference, hope they can bring you help. https://www.youtube.com/watch?v=e6wvb_kh4Jg&t=3s