摘要 |
<p>In a threaded joint for steel pipes which are connected by threaded engagement of a pin member having a tapered male thread, a metal seal-forming portion, and a torque shoulder-forming portion on the end of a pipe, and a box member having a tapered female thread, a metal seal-forming portion, and a torque shoulder forming-portion corresponding to these on the end of a pipe, a buttress thread having contact at the load flanks and the thread root surface and gaps at the thread crest surface and the stabbing flanks is mixed in a single joint with a rugged thread having contact at the load flanks and stabbing flanks and having gaps at the thread root surface and thread crest surface.</p> |
申请人 |
SUMITOMO METAL INDUSTRIES, LTD.;VALLOUREC MANNESMANN OIL & GAS FRANCE;SUGINO, MASAAKI;YAMAMOTO, MIYUKI;IWAMOTO, MICHIHIKO;NAGASAKU, SHIGEO |
发明人 |
SUGINO, MASAAKI;YAMAMOTO, MIYUKI;IWAMOTO, MICHIHIKO;NAGASAKU, SHIGEO |