... , ASTM A53 Gr.B, St 37, St 42, St 52, Q 235, Q 195, Q345, 27SiMn seamless steel pipe Production Carbon seamless steel pipe Brand Xin ... -39mm Grade 10#,20#,45#,16Mn,27SiMn,12Cr1MoV,Q235, ST42,ST52,A106-a,A106-b, and so on Length 6-12m ... 1629-1984seamless steel tbesand pipesfor casingAPI SPEC 5CTJ55, N80APISeamless steel tubes foroil casing andtubing in oil wellsAPE SPEC 5LA, B, X42APISeamles ...