Manufacturing Process for Copper Strip

Melting and casting of special alloys is carried out using shaft furnaces, coreless furnaces, and other equipment.

The casted ingots are heated to 700–1,000℃ to homogenize the structure and composition.
While still hot, the heated slabs are rolled from approximately 250 mm thickness down to about 20 mm.

The material is cold rolled to the specified thickness at a reduction ratio that achieves the required mechanical properties.
This includes rough rolling, intermediate rolling, and finish rolling. Rolling mills vary by roll arrangement: 2-high, 4-high, 6-high, or multi-high mills (12-high, 20-high).

Annealing is performed at 300–700℃ for several hours to up to one day.
The annealing atmosphere is either non-oxidizing or reducing, and heating is conducted indirectly by heating the atmosphere.

The stock is slit to customer-specified widths and lengths (or unit weight).

Tin plating is applied to the surface of the material.
After plating, the surface is reflowed (melted) to improve resistance to whisker formation and solderability.

After slitting (or plating), shape and material inspections are performed to ensure that only high-performance, high-quality copper strip products are shipped.