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See Chinese contents: GB/T 31925-2015 GB/T 31925-2015: Ultrasonic test methods of heavy wall thickness seamless steel pipes and tubes
This Standard specifies the piezoelectric ultrasonic test principles, test methods, comparison specimen, flaw-detection equipment, test procedure, result assessment, test report of seamless stainless steel pipe with the ratio of wall-thickness to outside diameter in the range of 0.2~0.3.
