Expansion process for reducing the stresses in a seamless metal tube
US4174233A · kind A · utility
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5References
4Claims
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Assignee
Inventor
Key dates
| Filing date | Sep 22, 1977 |
| Grant date | Nov 13, 1979 |
| Priority date | — |
| Expiry date | Sep 22, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49805
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for reducing the residual stresses in a seamless metal tube which has undergone a straightening operation comprising subjecting the tube to an internal pressure of between 0.8 Pc and 1.0 Pc for a period of at least 3 minutes, while maintaining the temperature of the tube at or close to ambient temperature, Pc being the critical pressure beyond which the tube will undergo plastic deformation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.