This standard replaces the three standards ZB Y201-84, ZB Y202-84 and JB/T 5455-91. This standard specifies the product classification, technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of fixed (mobile) industrial X-ray flaw detectors. This standard applies to fixed (mobile) industrial X-ray flaw detectors with tube voltages not exceeding 500kV.