| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of evaluating the surface flaw of a steel material capable of quantitatively evaluating the occurrence state of a flaw. Ž<P>SOLUTION: An ultrasonic flaw detecting test, which rotates an ultrasonic flaw detecting probe around the steel material to spirally detect the flaw of at least one region of the cross section of the steel material over the longitudinal direction of the steel material, is performed with respect to at least one steel material to detect the flaw of the steel material. The flaw detected with respect to each steel material is arranged on the mesh in a data map wherein a first axis is set to the direction of rotation of the ultrasonic flaw detecting probe and a second axis is set to the longitudinal direction of the steel material. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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