... grade b carbon steel pipe 10#, 20#, 45#, 16Mn, Q235, Q345, Q195 O.D.: 20-508mm W.T.:1.8-100mm or more precision astm a ... 106 grade b carbon steel pipe1) Material: 10#, 20#, 45#, 16Mn, Q235, Q345, Q1952) Standards: ASTM A53, ASTM A106, API 5L, APL 5CT, ASTM A519, and ASTM ...