Welded steel pipe and tube OD: 21.3.1219mm WT: 1.2-20mm ... , X56, X60, X65, X70, J55, K55.N80 ETC.SIZE:ERW PIPE: OD: 21.3-508MM WT:2.5-12.7MMSSAW ... :219.1-2540MM WT:4-20MMLSAW PIPE: OD:219.1-2540MM WT:4-20MMSQUARE PIPE: OD:20*20-400*400MM WT:1 ... , thermoelectricity, project construction, bridge structure, oil and natural gas pressure steel tube. Good quality Welded steel pipe and tube