Chemical Composition of Austenitic Stainless Steel S31780 (0Cr19Ni13Mo3)
Austenitic stainless steel S31780 (0Cr19Ni13Mo3) is a high-alloy steel composed of chromium, nickel, molybdenum and additional elements for added strength and to improve its corrosion resistance. The composition of this austenitic stainless steel includes 0.06-0.15% of carbon, 17.50-19.50% of chromium, 11.50-13.50% of nickel and 3.00-3.50% of molybdenum.
Additionally, other elements such as nitrogen, sulfur, phosphorus, silicon and manganese may also be present in small amounts in the alloy. The nitrogen content in austenitic stainless steel S31780 (0Cr19Ni13Mo3) should not exceed 0.25%, while the silicon should not exceed 0.70%, sulfur should not exceed 0.030%, phosphorus should not exceed 0.040% and manganese should not exceed 1.0%.
Designed as an alloy with improved corrosion resistance, austenitic stainless steel S31780 (0Cr19Ni13Mo3) contains more chromium and nickel than the regular stainless steel alloys. This composition improves the steel’s resistance to a wide range of corrosive agents and environments, such as those containing chloride ions, which causes pitting and crevice corrosion in certain alloys.
Austenitic stainless steel S31780 (0Cr19Ni13Mo3) also offers good mechanical properties, meaning that it is able to endure stresses created by impacts, as well as high tensile strength, allowing it to resist stretching and bending. This type of steel is generally used in the construction of chemical process vessels, pipes and storage tanks and it also finds application in the paper and pulp industry where it can be used in cooling and heating circulation systems.
Austenitic stainless steel S31780 (0Cr19Ni13Mo3) can be welded to other austenitic stainless steel alloys with standard welding techniques. Trimming and cutting process may be used to trim and cut the material. However, special attention needs to be given to welds and heat affected areas to ensure that corrosion resistance is retained in these zones.
Austenitic stainless steel S31780 (0Cr19Ni13Mo3) can be easily formed and machined using standard equipment and tools such as saws and drills. The alloy can be bent and formed using cold working processes to reduce the chances of cracking and deformation. Annealing processes may be used for the relaxation of stresses in the steel and to improve its ductility. In certain applications, the steel may be susceptible to hydrogen embrittlement and needs to be treated while in a hydrogen atmosphere environment.
Austenitic stainless steel S31780 (0Cr13Ni13Mo3) is a high-alloy steel that provides improved corrosion resistance, due to its higher chromium and nickel content, and mechanical properties, making it suitable for use in a wide range of industries, such as chemical processing, power generation, and paper and pulp. In addition, the steel can be easily welded and machined with standard tools and equipment while taking the necessary precautionary measures to protect the welds and heat-affected zones.
