Method for evaluating press-formability of galvanized steel sheet
US7646846B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2005 |
| Grant date | Jan 12, 2010 |
| Priority date | — |
| Expiry date | Nov 7, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2223/076
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The press formability of a galvanized steel sheet including an oxide film, which has a thickness of 10 nm to 100 nm, as a surface layer is nondestructively speedily evaluated. A specific method for solving problems is characterized by including the steps of irradiating X-rays to a galvanized steel sheet, dispersing a fluorescent X-ray, which is excited and emitted in the applying, with an analyzing crystal exhibiting the difference in diffraction angle between a primary oxygen Kα x-ray and a secondary zinc Lβ x-ray of 2 degrees or more, detecting the X-ray, which is dispersed in the dispersing and which mainly contains the primary oxygen Kα x-ray, with a detector, separating an X-ray at an energy level within the range of ±25% to ±75% relative to the reference (100%) that is the energy level of the primary oxygen Kα x-ray from the X-ray, which is detected in the detecting and which mainly contains the primary oxygen Kα x-ray, by adjusting the window width of a pulse-height analyzer, measuring the intensity of the X-ray separated in the separating, and evaluating the press formability of the galvanized steel sheet on the basis of the intensity of the X-ray measured in the measuring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.