2205/Q235 Duplex Stainless Steel Composite Pipe with Large Diameter Used in Acid Medium

According to the special requirements for corrosion resistance of oilfield transportation pipeline,large area 2205/Q235 duplex stainless steel composite board was developed,and 426 mm×14 mm pipe with 2205 duplex stainless steel composite layer was manufactured successfully by submerged arc welding (JCOE) forming technology + argon arc welding and CO2 protection composite welding technology.By means of SEM,mechanical properties testing,HIC,SSCC and corrosion rate determination the properties of the composite pipe body were analyzed.The results showed that 2205 duplex stainless steel and Q235 carbon steel realized metallurgical bond completely.The shearing strength and other mechanical properties of composite pipe are accordant with relevant standards.The composite pipe had good HIC resistance and SSCC resistance properties.In the gas phase corrosion medium with H2S,CO2 and Cl-,the corrosion rate of the composite pipe was only 0.045 mm/a.This composite pipe could be used in acid medium transportation.