1)- Pickling line
2)- Hitachi mill
3)-Electrolytic cleaning line
5)-Skin pass mill
6)-Cut to length
7)-Colour coating line
8)-Customers of Bhushan steels
Pickling line is basically meant for removal of
rust and dust from the surface of HR coils.
Acid used for pickling is HCL.
Concentration of different pickling is:-
1)-Ist stage- 3.5%
2)-IInd stage- 7%
3)-IIIrd stage- 11%
Hitachi mill is used for the reduction of
thickness of the sheets.
It is also used in maintaining tension in the
Hydraulic load is applied on the 6 Hi rollers
%age reduction=(t1 – t2) / t1*100
This process is done for the removal of
coolant and other impurities on the surface of
Strip is passed through electrolyte and then
caustic soda solution where its surface is
Surface finish is also improved in this process.
Dryer is used for the removal of water on the
surface of the strip
Annealing is a process of heating, soaking and
controlled cooling of coil in a non oxidizing
Annealing is done to refine the grain structure
and reduce hardness of sheet.
Annealing is done at a temperature of 575-
Bell type Annealing is done for rolled sheets
Kathabar Bell is used for cooling of rolled sheet
so that the strip does not stuck with each other.
Oxygen gas is removed by filling up nitrogen
gas inside the bell.
Nitrogen gas is removed by filling hydrogen
Air cooling is done till the temperature reaches
Water cooling is done till the temperature
reaches to 125°C
Afterward cooling is done by dry air which is
formed on kathabar bells
In this mill the surface finishing of the rolled
sheet is increased.
Hardness is also increased as per requirement
It improves shape and temper of the material.
7% reduction of SPM is done in this mill.
Quality parameter is finally checked in this mill.
In this line sheets are cut according to the
requirement of the customer.
Shear blades are used for cutting of the
Sheets are dispatched for coloring or
Different types of color are coated on the
sheets as per requirement of the customer.
Sheets are first washed with alkaly and then
with water to remove dust.
Then chemical coating and primer costing is
After then different layers of paint is coated on
Then it is sent in oven after which quenching is
done and the roll is recoiled.
FOUR WHEELER CUSTOMER