Metallic tubular structure having improved collapse strength and

Details Metallic tubular structure having improved collapse strength and Metallic tubular structure having improved collapse strength and

1988-01-15

1989-05-02

Larson, Lowell A.

Metal deforming

By use of tool acting during relative rotation between tool...

During rotation of work

72367, B21C 3730

Patent

active

048256749

ABSTRACT:
Disclosed is a metallic tubular structure having an improved collapse strength characterized in that the tubular structure has a circumferential residual tensile stress left in the inner peripheral surface thereof, said residual stress ranging between 0 and 15 % of the yield stress of the tubular structure. The material of the structure may be any one selected from a group consisting of plain steel, alloy steel, stainless steel and Fe--Ni--Cr alloy. The tubular structure of the invention can suitably be used as pipes under severe condition such as in deep oil wells.

REFERENCES:
patent: 2178141 (1939-10-01), Frame
patent: 3054438 (1962-09-01), Wegner et al.
patent: 3222906 (1965-12-01), Aurin, III
patent: 3464253 (1969-09-01), Beyer et al.
patent: 4421575 (1983-12-01), Murata et al.

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