... -32mm, 16-50mm, 25-76mm, 32-89mm ......610mm diameter welded pipes straight welded pipe production line: 8-20mm, 12-32mm, 16-50mm, 25-76mm ... , 32-89mm,....,610mm diameter welded pipes.Work flow: {Steel strip}→→ Double ... .5mm 45m/min -508C φ508mmxl2.7mm φ219mmx5.Omm 30m/min . Straight Welded Pipe Mill Line