A 2205 duplex stainless steel tube defined the to 022-58651530 smelting ferrite phase and austenite phase proportion of each half of the stainless steel, referred to as the 2205 stainless steel tube, also known as the 2205 steel pipe manufactured in solid quenching organization. The the actual relative proportion of ferrite accounted for 45 to 55% the corresponding austenitic accounted for 55 to 45%, 2205 duplex stainless steel excellent performance guaranteed by an appropriate proportion of two-phase structure. 2205 duplex stainless steel tubing has excellent mechanical properties and corrosion resistance, good weldability, with a wide range of applications in the oil and gas industry, marine engineering, chemical industry and other industries. The oil and gas industry is the length of the duplex stainless steel materials laying oil and gas pipelines have been more than 850Km vast majority of 2205 duplex stainless steel seamless pipe (part S31803 duplex stainless steel, 2507 duplex stainless steel pipe); West-East Gas Pipeline Project 2205 stainless steel high-pressure pipelines transport natural gas medium corrosion. Second, the 2205 duplex stainless steel chemical composition C Si Mn PS Ni Cr Mo N ≦ 0.030 ≦ 1.00 ≦ 2.00 ≦ 0.030 ≦ 0.015 4.50 ~ 6.50 21.00 to 23.00 2.90 to 3.50 0.14 to 0.20