... 1.10#,20#,45#,16Mn, 2ASTM A106 Gr.B, ASTM A53 Gr.B, St 37, St 42, St 52, Q ... pipe 10#,20#,45#,16Mn, ASTM A106 Gr.B, ASTM A53 Gr.B, St 37, St 42, St 52, Q ... 20#,45#,16Mn,27SiMn,12Cr1MoV,Q235, ST42,ST52,A106-a,A106-b, and so on Length 6-12m. As customers ... steel tubes foroil casing andtubing in oil wellsAPE SPEC 5LA, B, X42APISeamles Steel Tubesand Pipes forHigh Pressure BoilerGB5310-199520G, 20MnG ...