Special properties 690 alloy has excellent resistance to intergranular corrosion and intergranular stress corrosion cracking, and is mainly used as heat transfer tube material for steam generators in pressurized water reactor nuclear power plants. The materials used for heat transfer tubes of steam generators in pressurized water reactor nuclear power plants have gone through a development process, including 304 austenitic stainless steel, 600 alloy, 800 alloy and 690 alloy. Research on corrosion failure of 600 alloy in service shows that intergranular corrosion and intergranular stress corrosion cracking are the main problems. Alloy 690 is used as a heat transfer tube material for steam generators in pressurized water reactor nuclear power plants. There have been no reports of damage since it was put into use in the 1990s.

chemical composition

Physical properties

main application

Alloy 690 is mainly used as heat transfer tube material for steam generators in pressurized water reactor nuclear power plants and is currently the core technology of steam generators. Most of the pressurized water reactor nuclear power plants under construction and planning also use 690 alloy as the steam generator heat transfer tube material.