... ,JIS,BS satanda Company Name : Liaocheng Xinglong Seamless Tube Manufacturing Co.,LtdNamest45-4 seamless steel pipe Brand nameXinglong (ourself)StandardAPI 5CT , ... -2008,GB6479-2000,GB9948-2006 Material St35.8, St44 ,St52, 20Mn2 ,10, 20,35,45, 16Mn,Q345,20G,20MnG ... chemical industry, Electrical Power, Coal, Machinery, Low and high-pressure boiler, hydraulic prop and so on.InvitationWelcome to Our two ...