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seamless elbow A420 GR. WPL6 butt weld elbow 1.seamless elbow size:1/2''-24'' 2.wall thickness:SCH10-SCH160 XS XXS STD 3.standard:ASTM B16.9,MSS SP-75-2004 ,DIN2605 4.material:ASTM A234-WPB.A420-WPL6...