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Austenitic stainless steel refers to chromium and nickel as the main alloying elements, the basic composition of austenitic stainless steel is Cr18Ni8 (18~8), that is, it contains about 18% chromium and 8% nickel. On this basis, by adding other alloying elements, can evolve a variety of different grades of austenitic stainless steel.
Corrosion resistance: Austenitic stainless steel has excellent corrosion resistance, because the high chromium content can form a very dense and strong chromium oxide protective film on its surface. In addition, the addition of molybdenum and other elements can further improve its seawater corrosion resistance.
Weldability: austenitic stainless steel has good weldability, welded joints even in the welded state also has high toughness. This is due to its stable austenitic structure, low thermal conductivity, high nickel content and low carbon content and other characteristics.
High and low temperature performance: austenitic stainless steel in the heating and cooling process does not occur in the phase change, so has a stable high and low temperature performance. It can maintain good mechanical properties and corrosion resistance in a wide temperature range.
Processability: austenitic stainless steel is easy to cold work and heat treatment, can be easily made into a variety of shapes and sizes.
304 austenitic stainless steel: one of the most common stainless steels, containing 18% chromium and 8% nickel. It has excellent resistance to common corrosion and high temperature, and is suitable for making processing containers, food equipment, cutlery and so on.
316 austenitic stainless steel: contains 2%~3% molybdenum, has excellent seawater corrosion resistance. Widely used in offshore engineering, marine oil development and chemical industry and other fields.
321 austenitic stainless steel: contains a certain amount of titanium, high temperature resistance is more excellent than 304 and 316 stainless steel. It is suitable for chemical processing and air heating equipment under high temperature.
904L austenitic stainless steel: contains a high proportion of nickel, chromium and molybdenum, has excellent corrosion resistance and resistance to strong acids. It is suitable for making equipment for sulfuric acid, phosphoric acid and other chemical media.
The production process of austenitic stainless steel includes smelting, casting, rolling, heat treatment and so on. Among them, the smelting process mostly adopts electric arc furnace with argon oxygen decarburization (AOD) or vacuum oxygen decarburization (VOD) method. Casting process needs to adjust the alloy composition to improve the liquid steel fluidity and improve casting performance. Rolling and heat treatment processes are used to improve the mechanical properties and corrosion resistance of steel..
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