Stainless steel wire has been used in many fields. Many people are interested in the production process of stainless steel wire. Here we will give a comprehensive introduction:
1、 Production process of stainless steel wire:
Raw material wire rod - surface oxide scale removal (chemical method) - drawing - heat treatment (solid solution) - secondary surface oxide scale pickling - drawing - inspection - packaging - warehousing. Austenitic steel in the heat treatment process is solution quenched at high temperature (martensite and ferrite are medium temperature disk annealing). Delivery status includes cold drawing, light drawing and soft drawing.
2、 Main processes of stainless steel wire:
The production of stainless steel wire mainly consists of three processes: surface pickling, drawing and heat treatment.
1. Pickling process
The simple and economical method is the conventional chemical removal method. Stainless steel oxide scale is composed of different alloy elements, which is difficult to remove. It cannot be removed by simple and single chemical methods, so it is removed by combined acid washing method. The combined acid washing method has more serious pollution and more complex wastewater treatment. In the production process, the acid liquor will produce harmful gases to pollute the air and wastewater to pollute the groundwater. For large-scale raw material production enterprises, online automatic surface cleaning and pollution-free centralized treatment of waste water and harmful gases are adopted, so many small enterprises in the terminal products are unable and uneconomically to take effective treatment, forming an entropy distribution pollution source.
2. Drawing process
In order to realize the drawing (deformation) smoothly, the friction between the steel wire matrix and the die wall must be reduced. Carrier (coating) lubrication technology is adopted. The stainless steel wire is difficult to form a solid coating due to its stable surface chemical property and no chemical reaction with the coating. It is often operated by mechanical methods such as ash hanging, adsorption and crystallization. There are oil lime, lime slurry, salt lime, oxalate coating and colloidal graphite, which are treated with water removal to form a film. Lubricants are divided into dry matter and water quality. The dry matter includes calcium and sodium, and the water quality includes sodium, colloidal graphite, and liquefied paraffin. The steel wire can become a product only after the surface of the steel wire is de coated. The pollution caused by drawing is the pollution of the working environment.
3. Heat treatment procedure
The stainless steel wire is annealed (solid solution) in a non vacuum heat treatment furnace, and its surface is oxidized at high temperature. Since stainless steel is composed of several alloy elements, the oxidation capacity of each alloy element is different, resulting in different degrees of oxidation, leading to uneven oxidation of the surface, affecting the surface quality of stainless steel wire, uneven tolerance, pitting and pitted surface. It causes invisible loss of alloy and wastes resources.
