Carbon Steel Coil

◆ Mechanical polishing: This method is usually done manually, which is to smooth out the concave and convex position of the steel coil. In this process, props such as sandpaper and oil stone strips are used. By mechanically polishing the steel coil, the surface quality of the steel coil can be improved.

◆ Chemical polishing: A chemical reaction is used in this polishing method to flatten the raised position of the steel coil plate. The biggest advantage is that there is no need to use too complicated equipment in this process and the polishing effect is good.

◆ Electrolytic polishing: The principle of electrolytic polishing is very similar to chemical polishing, but the effect of electrolytic polishing is better because this polishing method uses electrolyte to flatten the raised position on the surface of the steel coil.

There are three main differences between cold rolled coil and hot rolled coil.
◆ In appearance, the color of cold hard coil is a little darker.
◆ In terms of surface quality, structure and dimensional accuracy, cold hard rolled coil is better than cold rolled plate.
◆ In terms of performance, the cold hard coil directly obtained from hot rolled coil through cold rolling process, process hardening occurs during the cold rolling process, so that the yield strength and internal stress residual part increases, and it looks “hard” from the outside, so it is called cold hard coil. Generally speaking, the default delivery condition of cold rolled coil is annealed. Nowadays, most steel is sold in coils. After a company purchases a coil, it needs to be uncoiled before it can be processed. Generally speaking, it is used more in the automotive industry. Of course, many automotive industries outsource the uncoiling process and the plants use the uncoiled sheets directly.

Advantages of cold rolled steel coils.
Fast forming speed, high yield, no damage to the coating. Can be made into a variety of cross-sectional forms to meet the needs of the conditions of use; cold rolling can make the steel produce a large plastic deformation, thereby increasing the yield point of steel.