... steel welded tube safe, nice outlook, economical, environmental grade:200, 300 series O.D: max 219mm widely use stainless steel tube/ ... pipe 1. Grade: mainly common 200series, 300series 2.Technical: welded 3.Outer Diameter: 9 ... safe, nice outlook, economical, environmental Company Image: Stainless Steel Welded Pipe: Features:STANDARDS: AISI,ASTM,DIN,JIS,GB,ENGRADE ...