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00Cr18Ni5MO3Si2 and 00Cr18Ni5MO3Si2Nb are dual-phase stainless steels. Dual-phase stainless steels are a kind of special ferritic-austenitic stainless steel, which combines the general properties of ferritic stainless steel with the corrosion resistance of austenitic stainless steel. Therefore, it can be widely used in various chemical processing, transportation and storage industries due to its attractive combination of mechanical properties and corrosion properties.
Among the common stainless steels, 00Cr18Ni5Mo3Si2 and 00Cr18Ni5Mo3Si2Nb are high chromium and nickel dual-phase stainless steels. The nominal composition of steel is 18Cr-5Ni-3Si-2Mo+2Nb, with a nominal chromium content of 18%, a nickel content of 5%, an average carbon content of 0.6%, a molybdenum content of 2.2%, an average nitrogen content of 0.1%, and silicon and niobium that make up the rest of the composition.
The microstructure of 00Cr18Ni5Mo3Si2 and 00Cr18Ni5Mo3Si2Nb in the original state is similar to that of common ferritic stainless steels, and contains a large amount of ferrite and small amounts of carbides and carbide compounds. When heated in an appropriate temperature cycle, the main part of the ferrite in the steel will transform into austenite, and the rest of the ferrite and micro-austenite will form in about 70% of the length of the plate section thickness after quenching. Its properties are balanced between the properties of ferritic stainless steel and austenitic stainless steel: it has high strength and good ductility, which is better than those of the pure ferrite and pure austenitic state. At the same time, it also has a high wear resistance and a greater corrosion resistance than the common ferritic stainless steel.
The 00Cr18Ni5Mo3Si2 and 00Cr18Ni5Mo3Si2Nb dual-phase stainless steel are also resistant to pitting, corrosion and high temperature corrosion. In addition, due to the presence of niobium, the welding performance of these steels is better. In particular, the 00Cr18Ni5Mo3Si2Nb steel has good local plasticity and can provide greater workability than the 00Cr18Ni5Mo3Si2 steel. It can be used for general parts with relatively complicated shapes, with excellent capabilities for cold forming, bending, welding and other working processes.
Overall, 00Cr18Ni5Mo3Si2 and 00Cr18Ni5Mo3Si2Nb are excellent dual-phase stainless steels, due to the unique combination of mechanical and corrosion properties of ferritic and austenitic stainless steels. It is widely used in chemical processing, engineering and sanitation industries, and has been used in automotive body manufacturing and liquid food processing equipment due to its excellent performance in these areas.
