... steel pipe Standard:GB/T8162,GB/T8163-1999, ASTM A53, ASTM A106,ASTM A192,ASTM A210 OD:6-610mm(1/4"-24") Seamless Steel ... :GB/T8162,GB/T8163-1999, ASTM A53, ASTM A106,ASTM A192,ASTM A2102.Grade:A 106 GR.B,A106 GR.A ,A53 GR.B,A53 GR.A 10#,20#,35#,45 ... #,Q345(16Mn),ST37-2,ST35.8,ST35.4,ST42,ST45,ST52,ST52.4,ST52.3 ASTM ...