2 February 2016

Cold rolling advantages and disadvantages

Cold rolling is a process that introduces the sheet metal or strip stock between rollers and then compresses and squeezes it. The amount of strain introduced determines the finished product's hardness and other material properties. This process increases the yield strength and hardness of the metal creating a hardened microstructure which prevents further slip. Now in this article, you can check it out the pros and cons of cold rolling one by one below.

Advantages of cold rolling :

  • In the absence of coiling and oxidation, tighter tolerances and better surface finish can be obtained.
  • Thinner walls are possible.
  • It is possible to retain the high strength achieved during cold rolling.
  • It will not damage the surface by forming fast speed, high efficiency, and coating.
  • Cold rolling can make the steel produce large plastic deformation, thus improving the yield point of the steel. 
  • Cold rolling can be made into a variety of cross-section forms to meet the requirements of use conditions. 
  • Short manufacturing time and prompt delivery. 
  • Excellent strength/weight ratio. 
  • Many inline ancillary operations possible such as punching, piercing, curving and folding. 

Disadvantages of cold rolling :

  • There will be residual stress on the cross-section, which will affect the buckling resistance of the steel.
  • Due to its relatively poor torsional performance, so when flexural compression, it is prone to reverse.
  • The thickness of steel is thin, and therefore the ability to withstand localized concentrated load is relatively poor.
  • Small reductions give rise to surface stresses and non-uniform stress distribution. 
  • Reduced ductility, therefore, require subsequent annealing treatment. 
  • Equipment used in this process is big and expensive.