Threaded joint for pipes
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United States of America Patent
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May 23, 2017
Issued Date -
N/A
app pub date -
Feb 24, 2012
filing date -
Feb 28, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A threaded joint for steel pipes that includes a pin and a box. The pin has an externally threaded portion, a nose, and a shoulder portion. The box has an internally threaded portion, a sealing surface, and a shoulder portion. The outer circumferential surface of the nose of the pin has an outward convex curved shape, and the sealing surface of the box has a tapered shape. Additionally, the cross-sectional area of the pin at a seal point is 35% or more of the cross-sectional area of an original pipe portion corresponding to an unprocessed portion of the pin, the seal point being a portion on the pin that first comes into contact with the sealing surface of the box when the pin and the box are joined.
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