Inconel 690 Nickel Alloy Seamless Pipe

Inconel 690 is an alloy mainly used for heat transfer tube materials of steam generators in pressurized water reactor nuclear power plants. It is the core technology of steam generators.

Inconel 690 alloy is an austenitic nickel-based corrosion resistant alloy containing 30% Cr. It not only has better resistance to stress corrosion cracking than Inconel 600, Inconel 800, and 304 stainless steel in chloride-containing solutions and sodium hydroxide solutions, but also has high strength, good metallurgical stability and excellent processing characteristics. Especially in various types of high temperature water, Inconel 690 alloy shows a low corrosion rate and excellent stress corrosion resistance. These properties are very suitable for nuclear waste treatment devices, steam generators, and nitric acid resistant parts.

Chemical composition of Inconel 690:

Nickel-based alloy 690 chemical composition (mass percentage).

Physical properties of Inconel 690:

The physical and mechanical properties of annealed 690 alloy.

Main application of Inconel 690:

Among the PWR nuclear power plant units already in operation in my country, only Qinshan Phase I uses 800 alloy, and Qinshan Phase II, Daya Bay and Lingao nuclear power plants all use 690 alloy as the steam generator heat transfer tube material. Most of the PWR nuclear power plants under construction and planning also use 690 alloy as the steam generator heat transfer tube material. However, the 690 alloy tubes used in PWR nuclear power plants that have been in operation in China are basically purchased from abroad. The major foreign companies that produce 690 alloy pipes include France's Valinox, Sweden's Sandvik and Japan's Sumitomo.