... in 2009.Production Equipment Liaocheng Xinglong Seamless Steel Tube Manufacturing Co, Ltd. has equipped 60, 90, 140 and 325 mill lines ... 2008, GB8163-2008,GB3087-2008,GB5310-1995,GB6479-2000,ASTM A 53, A106, API 5L/5CT, DIN, JIS etc ... .Contact usSHANDONG LIAOCHENG ZGL METAL MANUFACTURING CO., LTDLIAOCHENG XINGLONG SEAMLESS TUBE MANUFATURING CO., LTDDavid John Sales ManagerAdd: No. 3 Taishan Road ...