The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 2019
Filed:
Nov. 02, 2016
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Nippon Steel Corporation, Tokyo, JP;
Vallourec Oil and Gas France, Aulnoye-Aymeries, FR;
Abstract
A threaded joint for steel pipe is provided that ensures good sealing performance and reduces crevice corrosion. A threaded joint includes a pin () and a box (). The pin () includes a first shoulder surface (), a first male thread (), a second shoulder surface (), and a second male thread (). The box () includes a first shoulder surface (), a first female thread (), a second shoulder surface (), and a second female thread (). Supposing that the distance between the shoulder surfaces of the pin () is represented as Land the distance between the shoulder surfaces of the box () is represented as L, and the interference δis defined by Equation (1) given below, then, the threaded joint is constructed such that Equations (2) and (3) given below are satisfied. In Equations (2) and (3), P is the thread pitch of the first male thread (), Δand Δare the lower and upper limits, respectively, for the difference between the numbers of tightening rotations, and λ is the elongation of the portion of the pin () located closer to the tip than the second shoulder surface () is.[Formula 1]δ  (1)+λ≤δ+λ  (2)Δ=− 9/100, Δ= 3/100  (3)