UNS Number N06690

Inconel 690 is a high chromium nickel alloy having excellent resistance to many corrosive aqueous media and high-temperature atmospheres. The substantial chromium content gives the alloy outstanding resistance to oxidizing chemicals and to high-temperature oxidizing gases. In addition to its corrosion resistance, Inconel 690 has high strength, good metallurgical stability, and favorable fabrication characteristics.

Available Forms of Inconel 690 at Rooplaxmi Steels:

• Bar
• Sheet
• Plate
• Pipe & Tube (welded and seamless)

Characteristics of Inconel 690:

• very good resistance to fluoride containing hot nitric acid
• good resistance to stress corrosion cracking caused by alkali
• excellent resistance to stress corrosion cracking caused by media containing chloride and polythionic acids,
• excellent resistance to many aggressive aqueous media or in the primary and secondary loops of nuclear reactors
• good resistance to oxidation, sulphidation and metal dusting in hot gases
• good mechanical properties at room temperature and high temperature, paired with high ductility.

 

Inconel 690 Chemical Composition, %:

Ni	Cr	Fe	C	Si	Mn	S	Cu
58.0 min	27.0-31.0	7.0-11.0	0.05 max	0.50 max	0.50 max	0.015 max	0.50 max

 

Application of Inconel 690:

•           Heat exchangers
•           Steam Generators
•           High temperature applications exposed to caustic solutions
•           Chemical processing industries
•           Nuclear and power industries
•           Oil and gas industries

 

Machining and Fabrication with Inconel 690:

Inconel 690 can be processed using standard industrial production techniques. It can be hot worked at a temperature range of between 1,230 and 900 °C (2,250 and 1,650 °F) with subsequent rapid cooling down in water or by using air nozzles. Solution annealing should be carried out at temperatures between 1,020 and 1,070 °C (1,870 to 1,960 °F). It is forged at 1038 to 1233°C (1900 to 2250°F).
It is hardened by cold working. The alloy shows excellent weldability, and may be joined to other dissimilar metals and alloys using the appropriate filler metals. For extreme corrosive conditions, advice should be taken regarding the appropriate filler metal to be used.

 

Inconel 690 ASTM Specification:

Pipe Smls	Pipe Welded	Tube Smls	Tube Welded	Sheet / Plate	Bar	Forging
B163	B163	B163	B163	B168	B166	B564

 

Mechanical Properties of Inconel 690:
(20°C / 68°F)

Tensile Strength	>586 MPA
Yield	(0.2 % offset) >240 MPA
Elongation	>30 %