Abstract: A large quantity of T22 steel hi-pressure boiler pipes was purchased by a big domestic boiler manufacturer from Yangzhou Longchuan Steel Pipe Co., Ltd.It was rather difficult to get such boiler pipes heat treated, and nonconforming lots were frequently found.The nonconformance of the pipes covers rather high hardness, unstable microstructure and uneven grain sizes.So it was a common case to get the pipes re-heat treated, resulting in such disadvantages as longer manufacture cycle, lower production efficiency and higher operation cost.Accordingly, a series of research activities concerning the said T22 steel pipes are conducted, and based on the results, appropriate heat treatment process are established, which ensures mush higher heat treatment yield of the pipes.