Raw materials used are
These substances are added into an
The mix is then treated in Argon Oxygen Decarburization (AOD) Convertor where pipes blast Argon and Oxygen gases into it.
The mix is then treated in a tank degassing unit which is additionally equipped with an oxygen blowing lance. Due to reduced carbon monoxide partial pressure under vacuum condition, this process helps in
The stainless steel slabs are then reheated due to which a rusty scale (oxide) is accumulated on the surface. This scale is removed from the surface by
The stainless steel slab is then sent back and forth through the Roughing Mill to
Having acquired the shape of a sheet, it is now sent to
These stainless steel slabs are now turned into plates (~20 mm thickness) or coils (~6 mm thickness) as per order after
The hot rolled (HR) coil undergoes a thermal process called annealing, in which the metal is given a consistent, uniform internal structure and homogeneous properties. This helps to
The stainless steel coil then goes through a chemical process, Pickling, in which mill scales,
There is quality testing at each stage of production, where a sample is taken from the product, and sent to labs for physical and chemical examination.
The resultant product is called Hot Rolled Annealed Pickled (HRAP) stainless steel coil which goes either directly to the customer, or to be made into
CRAP coil goes through several production processes aimed at customising surface finish, thickness, product chemistry and mechanical properties.
The stainless steel coils in Cold Rolling Division are reduced to