Hot Rolling

Hot rolling consists of three main types of rolls: strip rolls; sheet rolls; and rod rolls. This method is used to reduce the size of wrought-iron ingots or bars. The Bessemer process was made mandatory in the rolling technique so manufacturers could keep pace with the high demand of these materials needed for the market. Hot rolling is used for larger or thicker amounts of metal. The machines used for this application are very similar to cold rolling, but the requirements are not as important - such as keeping a precise thickness or exact edge dimensions. Hot rolling is mainly used with non-ferrous metals during the beginning stages of the breakdown of alloys. 

- - > Back to Top

Cold Rolling

Cold rolling steel is generally used at the end of a metal forming process. The following functions are applied to obtain and enable accurate dimensions in the finished product. Cold rolling also ensures a smooth clean appearance or finish and the straightness of the edges of the product. Cold rolling is to help obtain a degree of hardness known otherwise as temper in alloys. Once the desired temper is obtained it cannot be re-heated or it will lose properties intended for specific jobs.

Cold rolling is applied during the end process of production for strip and section rolled metals, such as foil. The cold roll mills are to obtain the desired thickness and also to limit and prevent any excess thinning of the already thin material. When rolling these alloys they are made long enough to make sure there are no creases or tears in the metal. The end result after the process of cold rolling will acquire the metal thickness and temper which is needed for each type of work.

- - > Back to Top