Metallic tubular structure having improved collapse strength and method of producing the same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 2, 1989
Issued Date -
N/A
app pub date -
Jan 15, 1988
filing date -
Nov 4, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully