Features of Austenitic Stainless Steel

Austenitic stainless steel has always played the most important role in stainless steel, its production and use of about 30% of the total output and consumption of stainless steel. As the austenitic stainless steel has excellent performance and characteristics, it is more and more attention and application, especially in the manufacture and production of nuclear power equipment, it is used to create important and key parts.

Austenitic stainless steel is the most basic alloying elements of chromium and nickel, representative of the grade is about 18% chromium, nickel is about 8% of chromium - nickel. The elemental proportions of chromium and nickel essentially ensure that the steel structure is stable austenite. Austenitic stainless steel development is very fast, in order to meet the needs of different conditions, in the 18-8 steel, based on the change in the content or add other alloying elements, giving this type of stainless steel better performance.

Austenitic stainless steel structure determines its mechanical properties is characterized by low strength and high plasticity and toughness. In China's stainless steel standard, given austenitic stainless steel tensile strength - as 480 ~ 520N / mm2; individual and 400N / mm2. According to the standard, austenitic stainless steel forging, rolling material did not give the impact test value, in fact, austenitic stainless steel solution heat treatment after the impact of up to 120J or higher. The mechanical properties can not be adjusted by heat treatment. 18-8 type to oxidizing media such as atmospheric, dilute nitric acid or medium concentrations of nitric acid, concentrated sulfuric acid is corrosion resistant, in sodium hydroxide and potassium hydroxide solution, at a fairly wide concentration and temperature Within a range of good corrosion resistance. In the reductive media, such as hydrochloric acid, sulfurous acid corrosion, in concentrated nitric acid is also not resistant to corrosion. In addition, the heating in the 850? ~ 400? interval slowly cooling, the chromium carbide from the grain boundary precipitation, so that the grain boundary produced local poor chromium area, resulting in intergranular corrosion. Austenitic stainless steel resistance to intergranular corrosion and carbon-related, the lower the carbon content, the stronger the resistance to intergranular corrosion. Austenitic stainless steel is sensitive to stress corrosion cracking. The nickel content in the steel plays an important role in improving the stress corrosion cracking.

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