Stainless Steel Coils
What is a Stainless Steel Coil?
A stainless steel coil is a long, slender strip of stainless steel wound into a roll after being processed at either elevated temperatures or room temperature. These coils serve as foundational raw materials for sheets, plates, and strips. Fabrication and a wide array of industrial applications.
Types of Stainless Steel Coils
We have two types of stainless steel coils, and they are as follows: Cold Rolled Coils and Hot Rolled Coils.
- Cold Rolled Coils (CR Coils)
Process: After hot rolling and cooling, the stainless steel undergoes cold rolling to reduce its thickness (from 0.4 mm to 5 mm) at ambient temperature. This is followed by annealing and coiling, and then other processes, such as pickling, are applied to relieve stresses and enhance the surface finish.
Characteristics: Compared to hot-rolled coils, CR coils are harder and stronger, feature a smooth, bright surface without oxidation, and offer superior dimensional accuracy. - Hot Rolled Coils (HR Coils)
Process: The slabs are heated above the recrystallisation temperature from 900°C to 1200°C, passed through rollers, and wound into coils. These may then be annealed and pickled to produce HRAP coils with cleaner finishes.
Characteristics: HR coils have less stringent dimensional tolerances and a rough, “brownish-black” oxide surface (HR Black); however, HRAP variants offer improved quality for downstream processing.
Applications of Jindal Stainless Steel Coils
- Cold Rolled Coils: Precision strips and sheets for automotive parts, petrochemical, oil & gas industry, architectural finishes, electronics, and white goods.
- Hot-Rolled Coils: Hot-rolled coils are commonly used in industries such as construction, particularly in railroads, where dimensional tolerance is not particularly critical.