... 52, Q 235, Q 195, Q345, 27SiMn 30 inch seamless steel pipe 10#,20#,45#,16Mn, ASTM A106 Gr.B, ASTM A53 ... , St 52, Q 235, Q 195, Q345, 27SiMnseamless steel pipe Production Carbon seamless steel pipe Brand Jingta Specification 10.29mm-508mm (1/8''-20 ... , Q345, Q390, 10MoVNb, 12CrMo, 15CrMo, 12Cr2MoISO 9329-2-1997 ASTM A161-94Seamless steel tubesfor petroleum crackingGB9948-8610, 20, 12CrMo, 15CrMo, 1Cr2Mo ...