Inconel* 690(UNS N06690)
1. Introduction:
INCONEL 690 (UNS N06690/W. Nr. 2.4642) is a high-chromium nickel-based alloy, which is a new third-generation alloy with better stress corrosion resistance and other properties under the working conditions of pressurized water reactor heat transfer tubes. The alloy was published in 1972 and is actually an improved alloy with increased chromium content on the basis of Inconel 600. Since 1982, this alloy has been used in the manufacture of U-tubes for the evaporator of PWR nuclear power plants. At present, it has been widely used in the evaporators of PWR nuclear power plants abroad and has begun to be applied to some components built in the reactor. At present, the 690 alloy heat transfer tubes for nuclear power steam generators developed by Baosteel Special Steel in China have been mass-produced and localized, and have been used in domestic nuclear power plants. Baosteel Special Steel's batch-manufactured UNS N06690 alloy U-shaped heat transfer tubes used in third-generation nuclear power steam generators have undertaken a contract of 325 tons and will be delivered to Shanghai Electric and Dongfang Heavy Machinery for use in the National Nuclear Shidaowan CAP1400 demonstration reactor project. Supply specification: Φ17.48x1.01mm.
2. Performance
Inconel 690 has excellent corrosion resistance to a variety of corrosive aqueous media and high temperature environments. In addition, Inconel 690 also has high strength, high metallurgical stability and excellent processing properties. The Cr in the chemical composition of the alloy gives the alloy significant resistance to oxidizing chemicals and high temperature oxidizing gas corrosion, and the high nickel content gives the alloy resistance to stress corrosion cracking in halide-containing environments and sodium hydroxide solutions.
3. Use
Inconel 690 is useful in applications involving nitric or nitric/hydrofluoric acid solutions. Such as exhaust gas heaters in nitric acid production, and vessels and heating coils for nitric acid/hydrofluoric acid solutions in stainless steel pickling and nuclear fuel recovery.
The alloy's corrosion-resistant properties to sulfur-containing gases make it a popular material for use in a variety of applications: coal gasification units, burners and furnace tubes for sulfuric acid processing, petrochemical furnaces, heat exchangers, incinerators and disposal Vitrification equipment for radioactive waste.
Inconel 690 exhibits very low corrosion rates and excellent resistance to stress corrosion cracking in various types of high temperature water environments. Therefore, the alloy is widely used in steam generator tube sheets, tube sheets and various hardware for nuclear power generation.
4. Similar brands
NS315, NS3105, 2.4642, NC30Fe, ISO NW6690
5. Chemical composition (%)
Nickel≥58.0, Cr=27.0-31.0, Fe=7.0-11.0, C≤0.05, Si≤0.50, Mn≤0.50, S≤0.015, Cu≤0.50
6. Relevant technical standards
Bar, Wire, Wire & Forgings - ASTM B / ASME SB 166, ASTM B 564 /ASME SB 564, ASME Code Case N-525, ISO 9723, MIL-DTL-24801
Seamless Pipe - ASTM B / ASME SB 163, ASTM B 167 / ASME SB 829, ASTM B 829 /ASME SB 829, ASME Code Cases 2083, N-20, N-525, ISO 6207, MIL-DTL-24803
Sheet, Coil, Strip - ASTM B / ASME SB 168 /906, ASME N-525, ISO 6208, MIL-DTL-24802
Seven, can provide product form
Sheets, strips, wires, bars, wires, tubes, forgings, etc. are all available.
Density Melting Young's modulus Poisson's ratio Yield strength Tensile strength Elongation
8.19g/cm 1343-1377ºC 211GPa 0.289 350MPa 700MPa 45%
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