Method for setting shape and working stress, and working environment of steel member
US6523416B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 29, 2001 |
| Grant date | Feb 25, 2003 |
| Priority date | — |
| Expiry date | Aug 29, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/2045
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A delayed fracture is effectively prevented by appropriately setting a shape and working stress, and working environment of a high strength member having more than 1,000 MPa of tensile strength. For this end, the relationship between a maximum value of diffusible hydrogen contents of unfailed specimens (Hc) and Weibull stress are found and the content of diffusible hydrogen entered into steel from the environment due to corrosion during the use of the steel member (He) is also found. Then, Weibull stress in the Hc that is equal to the He is found, thus determining the shape and working stress of the steel member so as to provide stress below the Weibull stress.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.