PROCESS FLOW CHART
The basic raw material is medium carbon & high carbon hot rolled coils. The coils are slitted on slitting machine for obtaining required width of hot rolled strips. After slitting these hot rolled strips are acid pickled through the continuous pickling line for removal of scale. The Pickled coils are cold rolled on 4 Hi AGC cold rolling mill to obtain the required thickness and annealed in HSD fired bell type annealing furnace for bright annealing. In case of medium and high carbon coils the process of rolling and intermediate annealing can be repeated to number of times depending upon the final thickness to be obtained. These coils after final rolling are slitted on CR slitting machine for obtaining the final required width. These cold rolled & slitted coils are sent to Hardening/Tempering division for further processing.
Hardening and Tempering of strips involve heating in electrically heated furnace in an air-tight muffle in inert atmosphere followed by Quenching & Tempering to attain desired hardness. The strips are then edge dressed (if desired). The grey strips obtained from H/T line are either buff polished or grinded to obtain bright finish. The strips can further be colored tempered to attain desired color (blue/yellow/bronze/golden) and finally inspected, oiled & packed for despatch.