Profile rolling the finished product is a bar or rod.
Steel sheet rolling process.
Rolling process has three steps to complete the product as shown in fig.
The starting material is usually large pieces of metal like semi finished casting products such as slabs blooms and billets.
Water powered rolling mills replaced the manual process in the late 17th century.
Although cold rolled steel is a specific type of steel the term is often used to mean all types of carbon steel materials.
Flat rolling the finished product is a sheet.
It s a steel fabrication process involving passing the metal through a pair of rollers.
Rolling process is defined as a process used to reduced the thickness and to make the thickness uniform.
Rolling is an important function of the steel industry.
Hot rolling is a metalworking process that occurs above the recrystallization temperature of the material.
Tin was often used to coat iron and steel sheets to prevent it from rusting.
Another interesting defect that can occur in flat rolling is alligatoring where the work being rolled actually splits in two during the process.
In cold rolling steel sheet is cooled at room temperature after hot rolling and is then annealed and or tempers rolled.
It is one of the most widely used among all the metal working processes because of its higher productivity and lower cost.
If the temperature of metal is above its re crystallization temperature then the process is known as hot rolling process.
The metals suited for this were lead copper zinc iron and later steel.
When steel is above the recrystallization temperature it can be shaped and formed easily and the steel can be made in much larger sizes.
If the temperature of metal is below re crystallization temperature then it is known as a cold read more.
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.
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.
The materials commonly rolled are steel copper magnesium aluminum and their alloys.
Cold rolling is a process by which the sheet metal or strip stock is introduced between rollers and then compressed and squeezed.
The metal sheet has a smoother surface and the strength of the steel is also increased.
The process of flattening metal sheets required large rotating iron cylinders which pressed metal pieces into sheets.
After the grains deform during processing they recrystallize which maintains an equiaxed microstructure and prevents the metal from work hardening.
