Black wire is also called annealing wire fire wire binding wire tie wire, and its surface is black or gray. It is mainly exported to binding wire tie wire. It is also a semi-finished product or raw material of various domestic silk screens.

       Roughness: common 0.7mm ~ 4mm(BWG22 ~ BWG8)(the wire diameter comparison table is attached below).

       Features: soft, strong toughness, good plasticity and wide application.

     Purpose: annealing wire is widely used in various fields such as architectural binding, product packaging, handicrafts and daily life. In the silk screen weaving industry, annealing wire is the raw material for producing black silk cloth, and it is also the intermediate material for producing zinc plated wire.

     Packaging: according to the needs of the guests, weigh the weight required by the guests, then pack the plastic film, and finally pack the woven bag or linen.

Black Wire steel wire rod after drawing hard-drawn wire it is made by annealing. Steel wire rod and hard-drawn wire have been introduced before. Today, the annealing process is mainly introduced.

  During the cold drawing process, the structure and mechanical properties of the steel wire change, resulting in work hardening. With cooling, it forms work, increasing the tensile strength, hardness, elastic limit, etc. of the steel wire, and increasing the elongation, the shrinkage rate of the section decreases. Due to the phenomenon of work hardening, when the deformation of Laba reaches a certain degree, the cooling processing performance of the steel wire will obviously decrease, which is not suitable for further drawing, at this time, it is necessary to carry out intermediate heat treatment on the steel wire, which has recovered and various processing properties. This intermediate heat treatment process is called annealing.

The purpose of annealing is to reduce hardness and improve machinability: relaxation of residual stress, stabilize size, reduce deformation and crack tendency; Refine grains, adjust organization and eliminate tissue defects.
   The annealing process is pull hard-drawn wire put people in the annealing tank or annealing furnace, slowly heating to a certain temperature, keep enough time, and then cool at an appropriate speed. After taking out, the purpose of annealing can be achieved. The annealing time is generally about 2-12 hours. The wire after annealing is called annealing wire.

  The production process is basically completed and then packaged. There is a very important process before packaging, which cannot be omitted. Oil injection. Fuel injection is usually pickling oil lubricating oil or engine oil. It can ensure that the silk will not rust for a long time and the surface will be brighter. Finally, according to the customer's needs weighing, 50kg,25kg,5kg,3kg,1kg, etc. A roll is then wrapped with a layer of plastic film and then a layer of linen or woven bag. Finally, if the factory inspectors pass the inspection, they can deliver the goods from the factory to the guests.