Abstract: Described here in the article are the background, the principle and the application of the tandem automatic ultrasonic detection technology for the HFW pipe.And also analyzed are the main aspects of the said tandem automatic ultrasonic detection equipment as located in the Baosteel HFW pipe production line, including the equipment configuration, the reference pipe drawing and the verification chart, etc.It is regarded via the analysis that as the first company adopting the automatic tandem ultrasonic detection system in the country, Baosteel is capable of meeting the requirements for inspection to heavy wall HFW steel pipe by the hi-end customers like SHELL.