Production of T22 Spiral Coil Tube for Steam Generator of HTGR

The manufacturing process of the T22 spiral coil for the steam generator of the high temperature gas cooled reactor(HTGR)is optimized with the methods described as below.First the finished straight tube for making the heat exchanger tube is manufactured with the process of secondary cold-rolling+primary cold-drawing deformation and the heat treatment process of normalization+tempering, and then the said straight tube is coiled and bent by the multi-head spiral coil forming machine and the space pipe-bending machine, and afterwards subjected to a number of finishing processes namely, outer surface shot blast, vacuum stress-relief heat treatment, surface oxidation treatment and surface immersion treatment, etc.The coil tube for the steam generator of the HTGR made with the methods as above mentioned is verified via relevant inspections and tests, and shows that it has its all property indexes up to applicable specifications and the customer requirements.