Method of steel grade determination for steel material

摘要

The method of steel grade determination for a steel material having a substantially circular cross-section comprise: a detection step in which while a measurement section 2 including an irradiation section 21 for performing X-ray irradiation and a detection section 22 for detecting fluorescent X-rays is relatively moved along an outer peripheral surface of the steel material 4 with respect to the steel material for a predetermined time period necessary for analysis, the steel material is irradiated with X-rays from the irradiation section, and fluorescent X-rays radiated from the steel material are detected by the detection section; a calculation step of calculating a composition of the steel material based on fluorescent X-rays detected in the detection step; and a determination step of determining a steel grade of the steel material according to the composition calculated in the calculation step.

主权项

1. A method of steel grade determination for a steel material having a substantially circular cross-section and a surface layer oxide scale on an outer peripheral surface thereof, by means of a fluorescent X-ray analysis method in a manufacturing line of the steel material, the method of steel grade determination for a steel material having the substantially circular cross-section comprising:
a detection step in which while a measurement section including an irradiation section for performing X-ray irradiation and a detection section for detecting fluorescent X-rays is relatively moved along an outer peripheral surface of the steel material with respect to the steel material for a predetermined time period necessary for analysis, the steel material is irradiated with X-rays from the irradiation section, and fluorescent X-rays radiated from the steel material are continuously detected by the detection section while the measurement section is relatively moved; a calculation step of calculating an averaged composition of all of portions of the steel material in which fluorescent X-rays are detected, based on an energy spectrum obtained from a number of fluorescent X-ray counts at each energy level of the fluorescent X-rays detected while the measurement section is relatively moved in the detection step; and a determination step of determining a steel grade of the steel material according to the composition calculated in the calculation step.