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Patent Searching and Data


Title:
SCREW JOINT FOR STEEL PIPE
Document Type and Number:
WIPO Patent Application WO/2011/040262
Kind Code:
A1
Abstract:
A screw joint for a steel pipe, having improved galling resistance, wherein the screw joint comprises: a pin which is provided with a male thread section having a triangular screw thread; and a box which is provided with a female thread section having a triangular screw thread and engaging with the male thread section, and also with a threadless sleeve section provided to the tip of the box, and wherein the screw joint satisfies the requirements of the standard for round screw joints set forth by the American Petroleum Institute. The threadless sleeve section of the box is reduced in length or eliminated so that the length of the threadless sleeve section in the axis direction of the box is less than or equal to 1/2 (including zero) the value defined in the standard. A swoosh section may be provided to the box end and/or the shape of the box which is defined in the standard may be changed so that the bevel angle at the end of the female thread section is within the range of ±15˚ of the slope angle of the female thread.

Inventors:
SUGINO Masaaki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
杉野 正明 (〒41 大阪府大阪市中央区北浜4丁目5番33号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
Application Number:
JP2010/066132
Publication Date:
April 07, 2011
Filing Date:
September 17, 2010
Export Citation:
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Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜4丁目5番33号 Osaka, 〒5410041, JP)
SUGINO Masaaki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
International Classes:
F16L15/04
Foreign References:
JPH09273671A1997-10-21
JPS58110793A1983-07-01
JPH11294650A1999-10-29
Attorney, Agent or Firm:
HIROSE Shoichi (Tozan Building, 4-2 Nihonbashi Honcho 4-chome, Chuo-k, Tokyo 23, 〒1030023, JP)
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