Steel Sheet Rolling Process

In short cold rolling results in a final metal sheet that is more accurate in terms of dimensions and properties than the one that is obtained from hot rolling process.

Steel sheet rolling process.

Rolling is an important function of the steel industry. Another interesting defect that can occur in flat rolling is alligatoring where the work being rolled actually splits in two during the process. It is one of the most widely used among all the metal working processes because of its higher productivity and lower cost. Profile rolling the finished product is a bar or rod.

The materials commonly rolled are steel copper magnesium aluminum and their alloys. The metals suited for this were lead copper zinc iron and later steel. Although cold rolled steel is a specific type of steel the term is often used to mean all types of carbon steel materials. The metal sheet has a smoother surface and the strength of the steel is also increased.

In sheet metal industrial practice a sheet may be passed through a series of leveling rolls that flex the sheet in opposite directions to flatten it. The process of flattening metal sheets required large rotating iron cylinders which pressed metal pieces into sheets. The starting material is usually large pieces of metal like semi finished casting products such as slabs blooms and billets. In cold rolling steel sheet is cooled at room temperature after hot rolling and is then annealed and or tempers rolled.

Tin was often used to coat iron and steel sheets to prevent it from rusting. Cold rolling is a process by which the sheet metal or strip stock is introduced between rollers and then compressed and squeezed. Hot rolling is a mill process which involves rolling the steel at a high temperature typically at a temperature over 1700 f which is above the steel s recrystallization temperature. Rolling process has three steps to complete the product as shown in fig.

The amount of strain introd. When steel is above the recrystallization temperature it can be shaped and formed easily and the steel can be made in much larger sizes. Rolling process is defined as a process used to reduced the thickness and to make the thickness uniform. Flat rolling the finished product is a sheet.

If the temperature of metal is below re crystallization temperature then it is known as a cold read more. Water powered rolling mills replaced the manual process in the late 17th century. If the temperature of metal is above its re crystallization temperature then the process is known as hot rolling process. There are two main types of rolling process.