Method for evaluating cleanliness of steel material
AssigneeNsk Ltd.
InventorsTomoki Doshida, Hiroyuki Uchida, Sho Hashimoto, Hideyuki Hidaka
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Abstract
There is provided a method for evaluating the cleanliness of a steel material by an ultrasonic flaw detection method enabling rapid acquisition of highly reliable data. Ultrasonic flaw detection is performed to detect a flaw in at least one part in the range of 90% or more and 100% or less of a steel material (for example, round bar 2) at a radial position where the center of the steel material is set as 0% and the surface is set as 100%, and then the cleanliness is evaluated based on the dimension and the number of inclusions in the steel material obtained by the ultrasonic flaw detection.
Claims8
A method for evaluating cleanliness of a solid steel material comprising:
- performing ultrasonic flaw detection to detect a flaw in at least one part in a range of 90% or more and 100% or less of the solid steel material at a radial position where a center of the solid steel material is set as 0% and a surface is set as 100%;
- and
- evaluating cleanliness based on a dimension and a number of inclusions in the solid steel material obtained by the ultrasonic flaw detection, wherein
- an evaluation volume of the solid steel material subjected to the ultrasonic flaw detection is at least 100,000 mm3, and
- the solid steel material is a round bar having a diameter between 42 mm and 82 mm.
Dependencies are inferred from the claim text.