THREADED COUPLING FOR PIPE

Title:

THREADED COUPLING FOR PIPE

Document Type and Number:

WIPO Patent Application WO/2012/118167

Kind Code:

A1

Abstract:

In a radial-seal type threaded coupling for a steel pipe, there is room for improvement in ensuring the seal in terms of the rigidity of a pin nose. Specifically, the nose portion outer peripheral surface of a pin (3) is provided with a shape of an outwardly convex curved surface, the seal surface of a box (1) is provided with a tapered shape, and the cross-sectional area of the pin at a seal point (sp), which is a part on the nose portion outer peripheral surface of the pin that first comes into contact with the seal surface of the box when establishing a threaded engagement, is set to be equal to or greater than 35 % of the cross-sectional area of a base pipe portion, which is an unprocessed portion of the pin.

Inventors:

KAWAI TAKAMASA (JP)
TAKAHASHI KAZUNARI (JP)
CHIKATSUNE HIROSHI (JP)
YOSHIKAWA MASAKI (JP)
TAKANO JUN (JP)
NAGAHAMA TAKUYA (JP)
UETA MASAKI (JP)
SONOBE OSAMU (JP)

Application Number:

PCT/JP2012/055292

Publication Date:

September 07, 2012

Filing Date:

February 24, 2012

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
KAWAI TAKAMASA (JP)
TAKAHASHI KAZUNARI (JP)
CHIKATSUNE HIROSHI (JP)
YOSHIKAWA MASAKI (JP)
TAKANO JUN (JP)
NAGAHAMA TAKUYA (JP)
UETA MASAKI (JP)
SONOBE OSAMU (JP)

International Classes:

F16L15/04

Foreign References:

JP2005351324A	2005-12-22
JP2006526747A	2006-11-24
JP2011501075A	2011-01-06
JPS6144068Y2	1986-12-12
JPS6144068A	1986-03-03

Other References: