... ,ASME B16.47,API 590China:GB/T9112~GB/T9124-2000,GB/T2506-1989(2005),GB/T2504-1989(2005),GB/T10746-1989,GB/T4450-1989Germany:DIN 2573~2576 ... ,CBM1018-81,CBT47-1999Industry Standard:JB/T74-1994,JB4700-4707-2000,JB/ZQ4485-4486-1997Industry Standard:HG/T20592-2009,HG/T20615 ...