公开(公告)号：EP1631762B2

公开(公告)日：2018-01-10

申请号：EP04736111

申请日：2004-06-04

申请人： NIPPON STEEL & SUMITOMO METAL CORP ,  VALLOUREC OIL & GAS FRANCE

发明人： SUGINO MASAAKI ,  YAMAMOTO MIYUKI ,  IWAMOTO MICHIHIKO ,  NAGASAKU SHIGEO ,  DUTILLEUL PIERRE ,  ROUSSIE GABRIEL ,  VERGER ERIC

IPC分类号： F16L9/12 ,  E21B17/042 ,  F16L15/00 ,  F16L15/04 ,  F16L15/06

CPC分类号： E21B17/042 ,  F16L15/004 ,  F16L15/04

摘要： A threaded joint for steel pipes comprises a pin (1) and a box (2). The pin has male thread (11), a sealing surface (13), and a shoulder surface (14) located on the end face of the pin. Correspondingly, the box has female thread (21), a sealing surface (23), and a shoulder surface (24) which can mate or contact with the corresponding portions of the pin. The shoulder surface (14) of the pin (1) is provided at an end face of the pin. The sealing surface (13) of the pin (1) is located on a pipe end side near the male thread (11). A a nose portion (15) is provided on the pin (1) between the sealing surface (13) and the shoulder surface (14), the nose portion (15) being not in contact with a corresponding portion of the box (2).