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20inch BW elbow welded LR ASTM A403 Specifications 1.MATERIAL:ASTM A403 2.SIZE: Seamless 1/2"-24" Welded 24 "-72" 3.WALL THICKNESS:Sch5-Sch160,XXS,XS,STD 4.STANDARDS:ASTM B16.9,MSS SP-75-2004 ,DIN2605 ...