Cold rolling

In the cold rolling process the coil is rolled either ina single-stand reversing mill (narrow mills usingeither narrow hot mill product or slit wide mill product) or in a multiple-stand tandem mill to the required thickness. Most mills are computer controlled to ensure close thickness control,and employ specially prepared work rolls to ensure that the right surface standard is achieved on the rolled strip. The cold rolling process hardens the metal,because mild steel quickly work hardens. The cold rolled coils are suitable for applications such as panelling where no bending or very little deformation is needed. At this stage the coil is still not suitable for the manufacture of the all-steel body shell and it must undergo a further process to soften it; this is known as annealing.Car Repair Talk's forum.