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Introduction to stainless steel

   Stainless steel is a material with a close-to-mirror brightness and a cold and cold touch. It is a relatively avant-garde decorative material with excellent corrosion resistance, formability, compatibility and toughness. It is used in heavy industry and light industry. , the daily necessities industry and architectural decoration industries.

      Stainless acid-resistant steel is referred to as stainless steel. It is composed of stainless steel and acid-resistant steel. In short, steel that resists atmospheric corrosion is called stainless steel, and steel that resists chemical corrosion is called acid-resistant steel. Generally speaking, steel with a Wcr greater than 12% has the characteristics of stainless steel. According to the microstructure after heat treatment, stainless steel can be divided into five categories: ferritic stainless steel, martensitic stainless steel, austenitic stainless steel, Austenitic-ferritic stainless steel and precipitated carbonized stainless steel.

     Due to its excellent corrosion resistance, formability, compatibility and toughness over a wide temperature range, stainless steel is widely used in heavy industry, light industry, household goods industry and architectural decoration industries.

Anti-corrosion introduction

    In the process of manufacturing stainless steel equipment, there will be performance damage, defects and some substances that affect the surface, such as: dust, floating iron powder or embedded iron, thermal tempering and other oxide layers, rust spots, grinding burrs, welding arc marks, welding Splashes, fluxes, soldering defects, oils and greases, residual adhesives and paints, chalk and marker prints. The vast majority are not paying attention to or doing badly because they ignore their harmful effects. However, they are potentially harmful to the oxidized protective film. Once the protective film is damaged, thinned or otherwise altered, the underlying stainless steel will begin to corrode. Corrosion generally does not extend over the entire surface, but at or around the defect. This localized corrosion is usually pitting or crevice corrosion, which develops in depth and breadth, while most surfaces are not eroded.


    There are many classification methods for stainless steel materials, and the following are common, and the classification is most common according to metallographic organization.

Chemical composition classification
     It can be basically divided into two systems: chromium-based stainless steel (such as ferritic series, martensite series) and chrome-nickel stainless steel (such as austenite series, abnormal series, precipitation hardening series).
Metallographic organization classification
     Can be divided into austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, duplex stainless steel, precipitation hardened stainless steel.
Classified according to corrosion resistance type
     It can be divided into stress corrosion resistant stainless steel, pitting resistant stainless steel, and intergranular corrosion resistant stainless steel.
Classified by functional characteristics
      Can be divided into free-cutting stainless steel, non-magnetic stainless steel, low-temperature stainless steel, high-strength stainless steel.
      There are nearly 100 kinds of stainless steels that have been included in various standards in the world, and with the advancement of technology and the development of industry and agriculture, new stainless steel grades are still increasing. For a stainless steel of a known grade, the chromium equivalent [Cr] and nickel equivalent [Ni] can be calculated based on its chemical composition, and the Schaeffler-Delong stainless steel microstructure map can be used to roughly estimate the microstructure and properties of the steel.

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