... 4.ERW,LSAW,SSAW 5.black steel seamless pipes astm a106 Our seamless steel pipes are in accordance with a wide range ... -1.6,A333-7.9,A334-7.9,150M19,En46... Industrial processhot rolled,hot expanded,cold drawn,and hot galvanizedSurface treatmentTransparent ... against with the copy of B/L) black steel seamless pipes sch40 astm a106