Inconel 690/ UNS N06690 Alloy- SCALE STEEL.

​Inconel 690 is a kind of alloy mainly used for steam generator heat pipe material in pressurized water reactor nuclear power plant. It is the [SCALE STEEL]core technology of steam generator.

Chemical Composition for Inconel 690 Alloy
Ni Cr Fe C Al Ti Mn Si Cu P S
Rest 30.39 8.88 0.023 0.22 0.26 0.23 0.07 0.02 0.006 0.002

Physical& Mechanical Property
Density Melting Young’s modulus Poisson’s ratio Yield strength Tensile strength Elongation
密度 熔点 杨氏模量 泊松比 屈服强度 抗拉强度 伸长率
8.19g/cm 1343-1377℃ 211GPa 0.289 350MPa 700MPa 45%

Special Properties for Inconel 690 Alloy
The Inconel 690 alloy has excellent intercrystal corrosion resistance and intercrystal stress corrosion cracking resistance. It is mainly [SCALE STEEL]used as the material of steam generator heat transfer pipe for PWR nuclear power plant.The heat transfer pipe material for PWR nuclear power plant steam generator has undergone a development process, including 304 austenitic stainless steel, 600 alloy, 800 alloy and 690 alloy.Studies on corrosion failure of 600 alloys in service show that intergranular corrosion and intergranular stress corrosion cracking are the main problems.As the material of steam generator heat pipe in PWR nuclear power plant, no damage has been reported since the 690 alloy was put into use in 1990s.

Main applications for Inconel 690 Alloy
Of the pressurized water reactor (PWR) nuclear power plants in China, only Qinshan Phase I uses 800 alloy, and The Qinshan Phase II, Daya Bay and [SCALE STEEL]Lingao nuclear power plants all use 690 alloy as the steam generator heat transfer pipe material.Most of the pressurized water reactor nuclear power plants under construction and planning also adopt 690 alloy as the material of steam generator heat transfer pipe.