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See Chinese contents: GB/T 8361-2021 GB/T 8361-2021: Ultrasonic testing method for the surface of cold drawn round steel
This document specifies the testing principles, testing methods, qualifications of testing personnel, testing equipment and device, testing implementation, comparison samples, testing results evaluation, testing records and testing reports, etc. of the ultrasonic testing for the surface of cold-drawn round steel. This document is applicable to ultrasonic testing of longitudinal discontinuities on the surface and near surface of cold drawn round steel with a diameter of 6mm~80mm. The ultrasonic testing of other round steel processed into silver shiny surface after hot rolling can also refer to this document.
