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ASTM A789 / ASME SA789 TP321 / 321H ERW Welded Tube For Oil And Gas a) OD ( Outer Diameter ) : 5.80mm to 2032mm ( 0.23 inch to 80 inch ) b) WT ( Wall Thickness ) : 0.25mm to 28mm ( 0.01 inch to 1.125 ...