The coil is a kind of steel plate, but it is actually a thin steel plate which is long and narrow. 1.8 the breadboard is the breadth of 1.8m.

The difference between the volume and the flat is a cut package.
Cold rolled coil is obtained by pickling and cold rolling of hot rolled coil. It can be said that it is a kind of cold rolled coil.
Cold rolled coil (annealed): Hot rolled coil is obtained by pickling, cold rolling, bell annealing, flattening, and (finishing).
There are three main differences between them.
1, appearance, the general chill plate is a little black.
2, surface quality, structure, scale accuracy and so on cold rolled plate is better than cold hard coil.
3. Performance, because the cold-rolled coil directly obtained by cold rolling process hardening in cold rolling, resulting in yield strength added, and residual part of the internal stress, the external performance is more "hard" so called cold-rolled coil.
Cold-rolled coil (annealed state): is the cold-rolled coil before coiling through the bell annealing, after annealing, its work hardening phenomenon, internal stress is eliminated (greatly reduced), that is, yield strength decreased close to the cold-rolled before.
Therefore, yield strength: cold-rolled coil is greater than cold-rolled coil (annealed state), making cold-rolled coil (annealed state) more conducive to stamping.
The normal delivery status of cold-rolled coil is annealed.
Most of the steel is now sold in rolls. Enterprises in the purchase of coil materials in the future to be processed through the uncoiling process, generally used in the automotive industry more. Of course, there are also many automotive industry will be decoiling process outsourcing, factories directly use decoiling sheet metal.