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See Chinese contents: GB/T 38683-2020 GB/T 38683-2020: Method of ultrasonic testing for large inclusions in bearing steel
This Standard specifies the testing requirements, testing equipment, equipment calibration, testing process, evaluation and testing report of the ultrasonic testing method for large inclusions in bearing steel. This Standard applies to the testing for internal inclusions in bearing steel bars with a diameter or side length of 35 mm ~ 100 mm by immersion pulse reflection method with longitudinal wave incident probes. Material of other sizes or steel grades may also refer to this Standard.
