Mild Steel CR Coils

Mild Steel Cold Rolled (CR) Coils are a flat steel product processed at or near room temperature. This process refines the materials properties, making it a highly desirable material for applications requiring superior finish, precision, and formability.

Here is a detailed description:

1. Manufacturing Process

Mild steel, initially produced as Hot Rolled (HR) coils, undergoes further processing:

• Pickling: The hot rolled coil is cleaned, typically with acid, to remove surface scale (iron oxide).

• Cold Rolling: The pickled coil is then passed through a series of rollers at room temperature (below the steels recrystallization temperature). This reduces its thickness, increases its strength and hardness, and improves dimensional accuracy.

• Annealing (Optional but Common): The cold-rolled coil often undergoes heat treatment (annealing) to reduce internal stresses, improve ductility (ability to be formed), and soften the material.

• Skin Pass (Optional): A final, light cold rolling to improve surface finish, remove minor defects, and control mechanical properties like yield point elongation.

• Oiling: The finished coil is usually coated with a thin layer of oil to prevent rust and corrosion during storage and transport.