Cr Coil For Automobile Sector

Product Description

A Cold Rolled Coil (CRC) is a type of steel product manufactured from hot-rolled steel coil that has been further processed through a cold rolling method.

Here is a description covering its manufacturing, characteristics, and common uses:

1. Manufacturing Process

Cold rolling is performed at or near room temperature (below the steels recrystallization temperature), which gives it its name. The key steps are:

1. Pickling: The initial hot-rolled coil is cleaned by immersing it in an acid solution (like hydrochloric acid) to remove surface scale and oxides.

2. Cold Rolling: The cleaned, flat steel is passed through a series of rollers under high pressure. This reduces its thickness (up to 90% of the original) and significantly improves its surface finish and mechanical properties.

3. Annealing (Heat Treatment): The coil is heated in a controlled atmosphere and slowly cooled to relieve internal stresses that built up during rolling. This process increases the steels ductility (formability) and softness.

4. Skin Pass (Optional): A final, light cold rolling pass is often applied to further improve the surface finish, ensure flatness, and prevent the aging of the steel.

5. Coiling: The finished, thin, flat steel sheet is wound into a large roll or coil for storage, transport, and further processing.