Standard GB, DIN, ASTM Standard GB/T 8163-1999, ASTM A106-2006, ASTM A53-2007 Grade 10#-45#, Cr-Mo alloy, A53-A369, Q195-Q345 Grade 10#, 20#, 45#, 15CrMo, 12Cr1MoV, A53(A, B), A106(B, C), Q235, Q345 Thickness 3 - 30 mm Section Shape Round Outer Diameter 23 - 168 mm Place of Origin Shandong, China...