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See Chinese contents: GB/T 7233.1-2009 GB/T 7233.1-2009: Steel castings -- Ultrasonic examination -- Part 1: Steel castings for general purposes
This Part of GB/T 7223 specifies the requirements for the ultrasonic examination of steel castings (non-austenitic steel) for general purposes, and the methods for determining internal discontinuities by the pulse-echo technique.
