The basic concept of stainless steel card buckle

Stainless steel is short for stainless acid-resistant steel. Specifically refers to the atmosphere, water vapor, water and other weak corrosive medium in the corrosion resistant or with stainless steel grade is called stainless steel; And resistance to chemical corrosion medium ( Acid, alkali, salt and other chemical etching) Types of steel called acid-resistant steel. Due to the differences in chemical composition and make them both the corrosion resistance of different, ordinary stainless steel is generally not resistant to chemical corrosion medium, and acid is commonly have stainless steel. In layman's terms, stainless steel is not easy to rust, actually part of stainless steel, there are both not to rust, and acid resistance ( The corrosion resistance) 。 Stainless steel does not rust and corrosion resistance is due to its rich chromium oxide film on the surface ( Passivation film) The formation of. This is not to rust and corrosion resistance is relative. The corrosion resistance of stainless steel depends on the alloy element content in the steel. Chromium is the basic element to stainless steel for corrosion resistance, while about 12% chromium content in steel, chromium and oxygen effect of corrosive medium, in the steel surface to form a thin layer of oxide film ( Since the passivation film) , but to prevent further corrosion of steel substrate. Commonly used alloying elements except chromium and nickel, molybdenum, titanium, niobium, copper, nitrogen, etc. , in order to meet the requirements of various applications on the microstructure and mechanical properties of stainless steel. A: precision stainless steel stamping process design principles