... Seamless Tube Manufacturing Co.,LtdNameseamless steel pipe astm a 106 Brand nameXinglong (ourself)StandardAPI 5CT ,API 5L,ASTM A53, ASTM 106ASTM A179, ASTM A192,ASTMA210,ASTM A213,ASTM ... 20#, 45#, 16Mn, Q195, Q235, Q345B, 30CrMo, 42CrMo Standard: ASTM-A106/A53/API5L Gr.B ST44, ST52 GB/8162, GB/8163 ... , GB8163-2008,GB3087-2008,GB5310-1995,GB6479-2000,ASTM A 53, A106, API 5L/5CT, DIN, JIS etc.greatly. ...