High-pressure piping metal tube and process for manufacturing th

Details High-pressure piping metal tube and process for manufacturing th High-pressure piping metal tube and process for manufacturing th

1996-11-08

1998-09-22

Jones, David

Metal deforming

By application of fluent medium, or energy field

72 60, 72 61, B21D 2602

Patent

active

058098186

ABSTRACT:
A high-pressure piping metal tube to be exposed to a high-pressure fluid on its inner face and having an increased number of service times, and a process for manufacturing the high-pressure piping metal tube. This high-pressure piping metal tube is made of a bent metal tube having a large thickness and a small diameter, in which a compressive stress is left in the inner face thereof. The high-pressure piping metal tube manufacturing process, comprises: the step of bending a metal tube having a large thickness and a small diameter; and the step of adding a residual compressive stress to the inner face of said metal tube.

REFERENCES:
patent: 4730474 (1988-03-01), Iwakura et al.
patent: 4735075 (1988-04-01), Saegusa
patent: 5042282 (1991-08-01), Kimura
patent: 5303570 (1994-04-01), Kaiser
patent: 5419171 (1995-05-01), Bumgarner
patent: 5481892 (1996-01-01), Roper et al.
patent: 5570602 (1996-11-01), Bauer

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