S30920 is a duplex stainless steel with excellent corrosion resistance and high strength. It belongs to the 12Cr18Ni12Mo3Ti type under the national standard, in which Ti exists as a stable element. S30920 stainless steel still has corrosion resistance in nitric acid below the boiling temperature of 65%, and is suitable for manufacturing equipment resistant to nitric acid, sulfuric acid, phosphoric acid, formic acid and acetic acid. Due to its excellent corrosion resistance, it is also widely used in petroleum, chemical, fertilizer, nuclear industry and other fields.
The chemical composition of S30920 stainless steel is C 008，si≤1.00，mn≤2.00，p≤0.035，s≤0.030，ni≤12.00-15.00，cr≥16.00-18.00，mo≥2.50-3.50，ti≥5×c%-0.70。
In the production process, the smelting quality of S30920 stainless steel has a great influence on both thermal work and corrosion resistance. The high nitrogen content in the steel will make the toughness, weldability and cold working properties worse, and the nitrogen content is 010% is appropriate. High sulfur levels can impair corrosion resistance, usually no more than 003%。Chromium is a strong carbide forming element that improves corrosion resistance, but it can lead to increased notch sensitivity, which can be inhibited by the addition of elements with lower activity than chromium, such as titanium or niobium.
The mechanical properties of S30920 stainless steel include strength, plasticity and toughness. Its tensile strength can reach up to 589MPa, and the elongation is also good, which can reach more than 40% in the annealed state. In the heat treatment process, its structure and performance can be controlled by adjusting parameters such as heating temperature and cooling rate.
In the manufacturing process, the welding performance of S30920 stainless steel is also important. In order to obtain the best welding quality and corrosion resistance, the appropriate welding method and filler metal should be selected. In addition, care should be taken to prevent problems such as stress corrosion and crevice corrosion during the manufacturing process.
In conclusion, S30920 stainless steel is a duplex stainless steel material with excellent corrosion resistance and high strength. It is widely used in petroleum, chemical industry, fertilizer, nuclear industry and other fields. In the process of production and use, attention should be paid to controlling its chemical composition, smelting quality, mechanical properties and welding properties.