Chemical composition of 309S steel plate
It is mainly composed of iron (Fe), chromium (Cr), nickel (Ni) three basic elements, of which chromium content is usually 22%-24%, nickel content in 12%-15%. The chromium element can form a dense and strong adhesion chromium oxide protective film on the surface of the steel plate, which is like a solid shield, effectively blocking the external oxygen, water vapor and other corrosive media, giving the steel plate basic corrosion resistance; On the one hand, nickel stabilizes the austenitic structure and ensures the good toughness and ductility of the steel plate, and on the other hand, it further enhances the corrosion resistance with chromium. In addition, it also contains a small amount of carbon (C), silicon (Si), manganese (Mn) and other elements, and the carbon content is strictly controlled at a low level (generally not more than 0.08%) to prevent chromium carbide precipitation, avoid grain boundary corrosion, and ensure the stability of the steel plate performance.
309S steel plate performance characteristics
Excellent high temperature resistance: The outstanding advantage of 309S steel plate is its excellent high temperature resistance characteristics, and it can still maintain good mechanical properties and chemical stability in high temperature environment. It is able to withstand temperatures up to 980 ° C - 1150 ° C, which makes it excellent in high temperature applications such as industrial furnaces, heat treatment equipment, aerospace engine components and so on. For example, the use of 309S steel plate in the lining and door of industrial furnaces, even if it is baked at high temperature for a long time, the steel plate will not easily deform and soften, and still maintain the structural strength to ensure the normal operation of the furnace.
Good corrosion resistance: In addition to high temperature resistance, in the general atmospheric environment, fresh water and a variety of weakly corrosive media, 309S steel plate also shows reliable corrosion resistance. The chromium oxide protective film on the surface can not only resist the erosion at normal temperature, but also continue to play a protective role in a certain degree of high temperature environment combined with water vapor and other conditions. Like some coastal areas of architectural decoration, outdoor sculpture, etc., if the 309S steel plate is used, it can effectively resist the corrosion brought by sea breeze and sea water droplets, and keep the appearance clean for a long time.
Stable mechanical properties: moderate tensile strength, yield strength and good elongation. The tensile strength is generally between 520MPA-670 mpa, the yield strength is about 205Mpa-310 mpa, and the elongation can reach 40%-60%. This combination of mechanical properties makes the steel plate not only withstand a certain static load, such as the external wall panels of buildings, support structures, etc., but also adapt to dynamic loads, such as vibration components in industrial equipment, to ensure safety and reliability under various stress conditions.
309S steel sheet processing properties
Welding performance: 309S steel plate welding performance is good, in the welding process, the use of appropriate welding process parameters, such as matching welding current, voltage, and the selection of welding materials with similar chemical composition of the base metal, can obtain high-quality weld. The structure and performance of the weld area are similar to that of the base material, and there will be no obvious weakening area to ensure the integrity and reliability of the entire weldment. This makes it widely used in large steel structures, pipeline systems and other projects requiring welding and assembly.
Cold processing performance: With good cold processing ability, can be cold rolling, cold bending, cold drawing and other processing operations. For example, in cold bending processing, pipe fittings and profiles of various shapes can be smoothly bent to meet different engineering design needs, and after cold processing, the mechanical properties and corrosion resistance of steel plates remain basically unchanged, providing convenience for customized production.
309S steel plate application field
High temperature industrial field: It is one of the preferred materials for the manufacture of high temperature equipment such as industrial furnace, heat treatment furnace and high temperature pipeline. In these equipment, 309S steel plate as the lining, shell or pipe wall material, with high temperature resistance characteristics, to ensure the equipment in the complex conditions of high temperature, high pressure, strong corrosion long-term stable operation, improve production efficiency, reduce equipment maintenance costs.
Architectural decoration field: Because of its high temperature resistance, corrosion resistance and beautiful metal texture, it is often used in the exterior wall decoration, curtain wall, roof and other parts of high-end buildings. Such as the facade of some modern skyscrapers and five-star hotels, the use of 309S steel plate not only improves the overall grade of the building, but also responds to the complex climate and environment of the city, and maintains the appearance for a long time.
Food processing and medical equipment: In food processing equipment, the material is required to be non-toxic, corrosion-resistant and easy to clean, and 309S steel plate meets these requirements and is used to make food cooking POTS, storage containers and other components. In terms of medical equipment, such as the shell of some high-temperature disinfection equipment and medical equipment, its high temperature and corrosion resistance ensure the safety and health of the equipment, and provide a reliable guarantee for the medical industry.
