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SUS 309 steel plate standard and composition

Standard specification: SUS 309 steel plate is a stainless steel material in Japanese standard (JIS). It is produced in accordance with strict Japanese industrial standards, which ensure the standardization and consistency of steel in terms of quality, performance and composition.

Chemical composition: Its main components are iron (Fe), chromium (Cr) and nickel (Ni). The chromium content is about 22-24%, and the nickel content is about 12-15%. Chromium can form a dense chromium oxide protective film on the surface of the steel plate, which is a key factor in the corrosion resistance of stainless steel. Nickel helps to stabilize the austenitic structure of steel, so that the steel plate has good toughness, ductility and corrosion resistance. In addition, it also contains a small amount of carbon (C), silicon (Si), manganese (Mn) and other elements, and the carbon content is generally low to prevent the precipitation of chromium carbide, avoid grain boundary corrosion, and ensure the stable performance of the steel plate.

Properties of SUS 309 steel plate

High temperature resistance: A notable feature of SUS 309 steel plate is its excellent high temperature resistance. It can maintain good mechanical properties and chemical stability in high temperature environment. Its high temperature range of 980-1150 ° C makes it excellent in high temperature applications such as industrial furnaces, heat treatment equipment, and aerospace engine components. For example, the use of SUS 309 steel plate in the lining of industrial furnaces, even under long-term high temperature baking, the steel plate will not easily deform and soften, and can still maintain the structural strength and ensure the normal operation of the furnace.

Corrosion resistance: In general atmospheric environment, fresh water and a variety of weak corrosive media, SUS 309 steel plate 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. For architectural decoration and outdoor sculpture in some coastal areas, if SUS 309 steel plate is used, it can effectively resist the corrosion caused by sea breeze and sea water droplets, and keep the appearance clean for a long time.

Mechanical properties are stable: moderate tensile strength, yield strength and good elongation. The tensile strength is generally between 520-670 mpa, the yield strength is about 205-310 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.

Processing properties of SUS 309 steel plate

Weldability: SUS 309 steel plate has good weldability. In the welding process, the use of appropriate welding process parameters, such as matching welding current, voltage, and the selection of welding materials similar to the chemical composition of the base material, 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.

SUS 309 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, SUS 309 steel plate is used as the lining, shell or pipe wall material. With high temperature resistance, it can ensure the long-term stable operation of equipment under complex working conditions of high temperature, high pressure and strong corrosion, improve production efficiency and 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, SUS 309 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, SUS 309 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.