LIFENG won an order of DUPLEX 2205 welded pipe, the size is OD406.4 x WT21.44 x L3000mm. In order to make sure the quality, LIFENG purchased the plates from Baosteel and performed WPQR before welding, the welding method is plasma arc welding + SAW, LIFENG also performed PWHT after welding. These pipes are used as pipeline for chemical plant, the photos are as below：