Study on "Hot Extrusion + Cold Pilgering" Manufacturing Process for 022Cr25Ni7Mo4N Seamless Steel Pipe

Supply of the 022Cr25Ni7Mo4N super duplex stainless steel seamless pipes has depended on import for so long a time. For localization of production of such pipes,the “Hot extrusion + Cold pilgering” manufacturing process is developed by Zhejiang JIULI Hi-tech Metals Co.,Ltd. Moreover,certain techniques for further processing the pipes are also studied,including hot working,cold working and solid solution treatment,etc. Owing to years-long efforts,the company has been capable of producing 022Cr25Ni7Mo4N pipes with all the properties in conformity with applicable technical specification,and made contribution to the localization of production of the pipes.