Patent ID: 7646846

Claim:
A method for evaluating the press formability of a galvanized steel sheet, comprising the steps of: irradiating X-rays to a galvanized steel sheet, which is a sample to be measured; dispersing a fluorescent X-ray, which is excited and emitted in the irradiating step, with an analyzing crystal exhibiting a 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 fluorescent X-ray, which is dispersed in the dispersing step and which mainly contains the primary oxygen Kα x-ray, with a detector; separating an X-ray portion from the fluorescent X-ray at an energy level within the range of ±25% to ±75% relative to a reference that is the energy level of the primary oxygen Kα x-ray, which is detected in the detecting step and which mainly contains the primary oxygen Kα x-ray, by adjusting a window width of a pulse-height analyzer; measuring the intensity of the X-ray portion separated in the separating step; and evaluating the press formability of the galvanized steel sheet on the basis of the intensity of the X-ray measured in the measuring step.