ZHAO Xiaodong, ZHOU Hanjie, HE Cheng

 

(Hangzhou Steam Turbine Co.Ltd. Hangzhou 310022, China)

 

 

Abstract: Aiming at the problems of the Gland sealing of the high pressure steam turbine occurred creep or corrosion easily and the high pressure turbine efficiency was decreased even running accidents because of the Gland sealing damaging and coming off, the different stainless steel materials for Gland sealing of the high pressure steam turbine were investigated and analyzed, after the analysis of the several stainless steel materials′ performances when it was worked in high pressure condition for a long time ,and combined with the international experience of advanced research and application. The result show that the austenitic stainless steel 06Cr18Ni11Ti is more suitable for Gland sealing of the high pressure steam turbine comparing with 1Cr18Ni9Ti and 06Cr19Ni10 , but the tempered sorbite stainless steel (such as X20CrMo13 or similar chemical composition of the martensitic stainless steel) as Gland sealing of the high pressure steam turbine is the best choice at present.

 

Key words: labyrinth seal; labyrinth strip; austenitic stainless steel; sensitizing temperature; martens stainless steel; tempered sorbite