Austenitic stainless steel has good production process performance, especially chromium-nickel austenitic stainless steel. Conventional means of producing special steel can smoothly produce plates, pipes, strips, wires, bars, forgings and castings of various common specifications. Because of the high content of alloying elements (especially chromium) and low carbon content, large quantities of such stainless steel are produced by arc furnace with argon-oxygen decarbonization (AOD) or vacuum deoxidization decarbonization (VOD). Vacuum or non-vacuum non-induction furnace can be used for small batches of high-grade products, and electroslag remelting can be added if necessary.
The excellent thermoplasticity of chromium-nickel austenitic stainless steel makes it easy to be processed by forging, rolling, hot piercing and extrusion. The heating temperature of ingot is 1150-1260 C, and the deformation temperature range is generally 900-1150 C. The steels containing copper, nitrogen and stabilized by titanium and niobium depend on low temperature, while the steels with high chromium and molybdenum depend on high temperature. Because of the difference in thermal conductivity, the holding time should be longer. After hot working, the workpiece can be air-cooled. Chromium-manganese austenitic stainless steel is highly susceptible to hot cracking. Ingot should be small deformed and multi-pass during billet initiation, and forgings should be heaped and cooled. It can be used for cold rolling, cold drawing and spinning, stamping, bending, edge rolling and folding. The work hardening tendency of chromium-nickel austenitic stainless steel is weaker than that of Chromium-Manganese steel. The cold deformation of Chromium-Manganese austenitic stainless steel after one annealing can reach 70%-90%. However, because of its high deformation resistance and strong work hardening tendency, the number of intermediate softening annealing should be increased. Generally, the intermediate softening annealing treatment is water-cooled at 1050-1100 C.
Austenitic stainless steel can also produce castings. In order to improve the fluidity of molten steel and casting performance, the composition of cast steel alloys should be adjusted to increase silicon content, widen the range of chromium and nickel content, and increase the upper limit of sulfur content of impurity elements.
Austenitic stainless steel should be treated by solid solution before use in order to dissolve carbides and other precipitates into austenitic matrix to the maximum extent, homogenize the structure and eliminate stress, so as to ensure excellent corrosion resistance and mechanical properties. The correct solution treatment system is water cooling (thin parts can also be air-cooled) after heating at 1050-1150 C. Solution treatment temperature depends on the degree of alloying of steel: molybdenum-free or low molybdenum steel should be lower (< 1100 C), while higher alloying grades such as 00Cr20Ni18Mo-6CuN and 00Cr25Ni22Mo2N should be higher (1080-1150 C).
Advanced technology is widely used in production, such as the refining rate outside the furnace is over 95%, the continuous casting ratio is over 80%. High-speed rolling mills, precision and fast forging machines are widely promoted. Especially in the process of smelting and processing, the realization of computer control ensures the reliability and stability of product quality and performance.
Shanghai Mizhang Trade CO.,LTD. is a large stainless steel wholesale and material processing company. The company’s main products: 2205, 2304, 2507 duplex stainless steel. Products are mainly used in: ship washing tower equipment, roadbed desulfurization tower, cooling tower, and many other industries. Domestic partners: Taigang, Baosteel, Zhangpu, Jiugang, Lianzhong, Qingshan, Dongfang Special Steel. Foreign partners: COLUMBUS, NAS, OUTOKUMPU, THYSSENKRUPP, Nippon Metal Industry, Nippon Yakin Kogyo and NSC. If necessary, please call the 24-hour hotline. As long as you order our products, no matter where you are, we will send professional technicians to serve you in time. Your satisfaction is our commitment.