Steel pipe for fuel injection pipe and method for producing the same
US11203793B2 · kind B2 · utility
2Cited by
1References
20Claims
0Family size
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Key dates
| Filing date | May 26, 2016 |
| Grant date | Dec 21, 2021 |
| Priority date | — |
| Expiry date | Sep 19, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D2211/009
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A steel pipe for fuel injection pipe has a tensile strength of 500 to 900 MPa and a yield ratio of 0.50 to 0.85, and has a critical internal pressure (IP) satisfying [IP≥0.41×TS×α] (α=[(D/d)2−1]/[0.776×(D/d)2], where TS: tensile strength (MPa) of the steel pipe, D: steel pipe outer diameter (mm), and d: steel pipe inner diameter (mm)), wherein a circumferential-direction residual stress on an inner surface of the pipe is −20 MPa or lower after the steel pipe is split in half in a pipe axis direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.