Cold Rolled (CR) Coils
CR Coil or cold rolled coil/sheets are hot rolled products which provides a superior surface finish, with improved physical properties of the steel, such as high formability, high strength, excellent dent resistance, good magnetic properties, tensile strength, and workability and welding properties.
MAKING OF CRAP COILS
Cold rolling usually involves the following steps.
- Cold rolling: It is being done to reduce thickness up to the required dimensions (available from 0.4 mm to 5 mm).
- Annealing: Subsequent to the cold rolling, annealing of the cold rolled strip is performed in order to relieve the stresses that build up within the material during the cold rolling process which reduces the ductility of the coil and is required for further processing operations.
- Coiling: Coiling of cold rolled coils is done for storage & transportation.
- Processing such as pickling, surface grinding, or bright annealing is performed as per customer requirements for improving the surface finish.
FEATURES
In terms of physical characteristics, cold-rolled materials are typically harder and stronger than standard hot-rolled counterparts. As the material is deformed at a lower temperature, the steel's hardness and resistance against deformation get increase due to work hardening.
A smooth & bright surface finish can be obtained due to fewer chances of surface oxidation.
The cold rolling is generally done using a 20-Hi-Sendzimier cold rolling mill. This type of rolling mill offers the advantages of great rigidity, bearing the rolling force uniformly along the entire width of the rolling mill through the backing bearing, and therefore the longitudinal and lateral dimensional accuracy of the sheet/ strip is high.
The CR Annealing & Pickling line is on environment-friendly LPG fuel with better temperature control, associated with Electrolytic and Acid Pickling with very high control on the pickling process.
Specifications of Cold Rolled Coil
| THICKNESS | 0.3 MM TO 4 MM |
| WIDTH | 900 MM TO 1250 MM |
| MAKE | TATA/JSW/AMNS/POSCO/IMPORTED |
| GRADE | ALL GRADE |
| OTHER CR TYPES | CRNO – COLD ROLLED NON-GRAIN ORIENTED |
| AVAILABLE | CRGO – COLD ROLLED GRAIN ORIENTED |
| SLIT WIDTH | 25 MM TO 1250 MM |