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INCONEL 690 / UNS N06690

Common Trade Names: Inconel 690, Alloy 690, Nickel 690.

INCONEL® alloy 690 (UNS N06690/W. Nr. 2.4642) is a high-chromium nickel alloy having excellent resistance to many corrosive aqueous media and high- temperature atmospheres. In addition to its corrosion resistance, alloy 690 has high strength, good metallurgical stability, and favorable fabrication characteristics.

The substantial chromium content gives the alloy outstanding resistance to oxidizing chemicals and to high-temperature oxidizing gases. The high level of nickel imparts resistance to stress- corrosion cracking in chloride-containing environments as well as to sodium hydroxide solutions.

Product description：

Alloy 690 has outstanding resistance to oxicdizing chemicals and to high-temperature oxidizing gases. And it has resistance to stress corrosion cracking in chloride-containing environments as well as to sodium hydroxide solutions.Alloy 690 is used for applications such as coal-gasification units，burners and ducts for processing sulfurics acid，furnaces for petrochemical processing， incinerators and so on.

Specifications：

Alloy 690 is designated as UNS N06690, W. Nr. 2.4642 and ISO NW6690.

Rod, Bar, Wire and Forging Stock: – ASTM B166; ASME SB 166, ASTM B 564; ASME SB 564, ASME Code Case N-525, ISO 9723, MIL-DTL-24801

Seamless Pipe and Tube: – ASTM B 163; ASME SB 163, ASTM B 167; ASME SB 167, ASTM B 829; ASME SB 829, ASME Code Cases 2083, N- 20, N-525, ISO 6207, MIL- DTL-24803

Plate, Sheet, and Strip: – ASTM B168; ASME SB 168; ASME N-525, ISO 6208, MIL-DTL-24802
Welding Products: – INCONEL Filler Metal 52 – AWS A5.14 / ERNiCrFe-7; INCONEL Welding Electrode 152 – AWS A5.11 / ENiCrFe-7

Product characteristics

1. Excellent resistance to many corrosive water media and high temperature environments.
2. High strength, good metallurgical stability, good processing performance.
3. Excellent resistance to oxidizing chemicals and high temperature oxidizing gases.
4. Resistance to stress corrosion cracking in chloride-containing environment and sodium hydroxide solution.

Scope of application：

The Inconel 690 is widely used in steam generator tubes, baffles, tubes and hardware in nuclear power generation.
Suitable for a variety of applications involving nitric acid or nitric acid/hydrofluoric acid solutions. Examples include tailpipe reheaters for nitric acid production and heating coils and tank coal gasification units for nitric acid/hydrofluoride solutions for stainless steel pickling and nuclear fuel reprocessing, burners and pipes for sulfuric acid processing, petrochemical treatment furnaces, heat exchangers, incinerators and glass vitrification equipment for radioactive waste treatment.

Chemical Composition：