Wire Finishes

Stainless steel wire is a product derived by cold finishing a coiled hot-rolled and annealed rod for the purpose of obtaining desired size with dimensional accuracy, improved surface, and specific mechanical properties. Wire is produced in a number of tempers and finishes. The finishes on wire are usually applied to meet the requirements of further processing, such as drawing, forming into parts, or coiling into springs.

Oil- or grease-drawn finish is a special bright finish for wire intended for uses such as racks and handles, where the finish supplied is to be the final finish of the end product. In producing this finish, lower drawing speeds are necessary and additional care in processing is needed to provide a surface with few scratches and with only a very light residue of lubricant.

Diamond-drawn finish is a very bright finish generally limited to wet-drawn stainless steel wire in fine sizes. Drawing speeds are necessarily reduced to obtain the desired brightness.

Copper-coated wire is supplied when a special finish is required for lubrication in an operation such as spring coiling or cold heading. Generally, copper-coated wire is drawn after the coating, the amount depending on the desired cold-worked temper of the wire.

Tinned wire is coated by passing single strands through a bath of molten tin. Tinned wire is used in soldering applications. The temper of the finished wire is controlled by processing prior to tinning.

Lead-coated wire is coated by passing single strands through, or immersing bundles of wire in, a bath of molten lead. The wire is then drawn to final size, with the lead forming a thin coating over the entire surface. This coating is useful on wire for coil springs, where it serves as a lubricant during coiling operations.

0 0

Post a comment