... : Liaocheng Xinglong Seamless Tube Manufacturing Co.,LtdNameseamless carbon steel pipe 20 Brand nameXinglong (ourself)StandardAPI 5CT ,API 5L,ASTM A53, ... 2008,GB3087-2008,GB5310-2008,GB6479-2000,GB9948-2006Size1/2'-24'Length6m or 12m or according to customer's requirementsWall ... : 27~426mm Length: 5.8~13m(as your requirment) Material: 20#, 45#, 16Mn, Q195, Q235, Q345B, 30CrMo, 42CrMo Standard: ASTM ...