... Liaocheng Xinglong Seamless Tube Manufacturing Co.,LtdNameseamless steel pipe astm a 106 Brand nameXinglong (ourself)StandardAPI 5CT ,API 5L,ASTM ... , chemical, power, gas, industrial, ship building, constructionContact :David John 86-15194009714 ZGL GROUP Certificate: ISO9001,API 5CT-0816,API ... 2008, GB8163-2008,GB3087-2008,GB5310-1995,GB6479-2000,ASTM A 53, A106, API 5L/5CT, DIN, JIS etc ...