The magnetic is iron, and the nonmagnetic is stainless steel. This statement is totally wrong. There are four systems in stainless steel: austenite, martensite, ferrite and duplex. The austenite is not magnetic, but it is slightly magnetic due to the loss of some elements during processing;

Compared with stainless steel for industrial structure, medical stainless steel is required to maintain excellent corrosion resistance in human body to reduce metal ion dissolution, avoid intergranular corrosion, stress corrosion and other local corrosion phenomena, prevent implant failure and fracture, and ensure the safety of implant, so its chemical composition requirements are relatively stricter.

Stainless steel is popular because of its advantages of "corrosion resistance, durability and environmental protection", but its application field is greatly limited due to its cold and monotonous color. Colored stainless steel came into being as the times require. It not only maintains the physical, chemical and mechanical properties of primary color stainless steel, but also has colorful and permanent colors. Its appearance meets the requirements of modern society for color diversification, and its application is becoming more and more extensive.

The raw materials of stainless steel wire are all produced by AOD or VOD and other refining methods outside the furnace. With the development from mold casting to continuous casting, the surface quality, inclusions and segregation of the material have been improved, creating favorable conditions for heavy production and greatly reducing production costs.