As compared with austenite stainless steel

the ferrite-austenite duplex stainless steel has higher mechanical properties

excellent stress and pitting corrosion

and lower cost due to lower Ni content

especially improve weldability of steel due to lower carbon content and higher nitrogen content in steel. Higher nitrogen content in duplex stainless steel has two favourable factors: depressing formation of δ ferrite and increasing pitting resistance equivalent. The 4 kinds of nitrogen bearing duplex stainless steel grades

and designation and chemical compositions of conventional duplex stainless steel;5 kinds of metallurgical processes; production of duplex stainless steel at Taiyuan Steel

thermomechanical processing for duplex stainless steel and trend of research and development of duplex stainless steel are presented in this article.