... according to customers requirement.Type Butt-welded seamless carbon steel pipe capsWall thickness Std, S40, S60, S80, Xs,FinishSatin, ... and heat treatment. 3.Detection Of Black Malleable Iron Pipe Cap The Company has nondestructive testing apparatus, supersonic testing ... rate of 100% in exfactory inspection of products. 4.Finish Product Of Black Malleable Iron Pipe Cap5.ISO Certificate For Black ...