What are the differences between cold rolling and hot rolling of steel wires for coilings?

Cold rolling and hot rolling are two distinct processes used in the manufacturing of steel wires for coilings. Hot rolling is performed at high temperatures, typically above the recrystallization temperature of the steel, which allows the material to be shaped more easily. This process results in a more ductile and less hard steel, which can be beneficial for certain applications. However, hot-rolled steel may have a rougher surface and may require further processing to achieve desired dimensions and surface finish. Cold rolling, on the other hand, is done at room temperature, which imparts a harder and smoother surface to the steel. It is more precise and results in tighter tolerances, making it suitable for applications requiring high strength and precision. Cold-rolled steel also has better surface finish and dimensional accuracy compared to hot-rolled steel. However, cold rolling is more energy-intensive and may not be suitable for very thick materials due to the increased hardness of the steel at room temperature.