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专利名称：THREADED JOINT FOR STEEL PIPE发明人：INOSE, Keita,SUGINO, Masaaki,OTA, Fumio申请号：EP16887831申请日：20160125公开号：EP3409991A4公开日：20190821
摘要：A pin (10) includes, in order from a free end of the pin (10), a shoulder surface(11), a first sealing surface (12), a first male threaded portion (13), a second sealingsurface (14), and a second male threaded portion (15). A box (20) includes a shouldersurface (21), a first sealing surface (22), a first female threaded portion (23), a secondsealing surface (24), and a second female threaded portion (25). The flank angles of loadflanks (13d and 23d) of the first male threaded portion (13) and the first female threadedportion (23) are each less than 0 degrees. The first male threaded portion (13) iscomposed of, in order from near the second sealing surface (14), an incomplete threadsection (31b) and a complete thread section (31a). The incomplete thread section (31b)has a length of at least three times the thread pitch thereof and has a thread heightlower than the thread height of the complete thread section (31a). The incompletethread section (31b) is provided with clearances between crests (13a and 23a) and roots(23b and 13b).
申请人：Nippon Steel Corporation,Vallourec Oil and Gas France
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