Austenitic and ferritic structure each accounted for about half of the stainless steel world pie network information . Containing C lower Cr content of 18% to 28% of the nickel content of 3% to 10%. Some steel also contain alloying elements of Mo World Steel Pipe News , Cu, Si, Nb, Ti, N. Class characteristics of the austenitic and ferritic stainless steel both, compared with the ferrite, ductility, toughness and higher, no room temperature brittleness, resistance to intergranular corrosion and welding properties were significantly improved, while maintaining there is iron ferritic stainless steel 475 ° C brittleness and high thermal conductivity, with superplastic characteristics. Compared with austenitic stainless steel, high strength and resistance to intergranular corrosion and chloride stress corrosion has improved significantly. Duplex stainless steel has excellent resistance to pitting corrosion is also a section of nickel stainless steel.