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* Inconel/Incoloy and Monel are
Registered Trademarks of Special Metals Corporation and its subsidiaries.
Inconel 617 Technical Data
Description: Inconel 617 is a solid-solution,
nickel-chromium-cobalt-molydenum alloy with an exceptional combination of
high-temperature strength and oxidation resistance. The alloy also has
excellent resistance to a wide range of corrosive environment, and it is
readily formed and welded by conventional techniques. The high nickel and
chromium contents make the alloy resistant to a variety of both reducing and
oxidizing media. The aluminum, in conjunction with the chromium, provides
oxidation resistance at high temperatures. Solid-solution strengthening is
imparted by the cobalt and molydenum.
Applications: The combination of high strength and oxidation resistance at temperatures over
1800 Degrees F makes Inconel 617 an attractive material for such components as ducting,
combustion cans, and transition liner in both aircraft, and land based gas
turbines. Because of its resistance to high-temperature corrosion, the alloy
is used for catalyst-grid supports in the production of nitric acid, for
heat-treating baskets, and for reduction boats in the refining of molybdenum. Inconel 617 also offers attractive properties for components of power-generating
plants, both fossil-fueled and nuclear.
Specification: Inconel 617 is available in Round Bar, Forging
Stock, Extruded Section, Pipe, Tube, Plate, Sheet, Strip and Wire.
Similar specifications are: UNS N06617, ASTM B 166, ASME SB-166, Boiler Code Sections I, VIII, SAE AMS 5887, SAE AMS 5888 and SAE AMS
Typical Mechanical Properties:
Inconel 617 Rupture Strength (1000 h)
|650 Degrees C / 1200
|760 Degrees C / 1400
|870 Degrees C / 1600
|980 Degrees C / 1800
|1095 Degrees C / 2000
The composition of Inconel 617 includes substantial
amounts of nickel, chromium, and aluminum for a high degree of resistance to
oxidation and carburization at high temperatures. Those elements, along with
the molybdenum content, also enable the alloy to withstand many wet corrosive
Oxidation and Carburization
The excellent resistance of Inconel 617 to oxidation results from the alloy's
chromium and aluminum contents. At elevated temperatures, those elements cause
the formation of a thin, subsurface zone of oxide particles. The zone forms
rapidly upon exposure to high temperatures until it reaches a thickness of
0.001 to 0.002 in. The oxide zone provides the proper diffusion conditions for
the formation of a protective chromium oxide layer on the surface of the
metal. It also helps to prevent spalling of the protective layer. Alloy 617
has excellent resistance to carburization.
Corrosion by Acids
Inconel 617 has good resistance to a variety of both reducing and oxidizing
acids. The chromium in the alloy confers resistance to oxidizing solutions
while the nickel and molybdenum provide resistance to reducing conditions. The
molybdenum also contributes resistance to crevice corrosion and pitting.
In boiling nitric acid, at concentrations under 20%, corrosion rates are less
than 1mpy (0.025mm/yr). At 70% concentration, the rate is a relatively low
20mpy (0.5 mm/yr). The rates were determined from tests of 72 hrs duration.
In sulfuric acid, alloy 617 has shown useful resistance to concentrations of
up to about 30% at a temperature of 175 Degrees F and about 10% at boiling
temperature. The table below gives the results of laboratory tests in sulfuric
acid. Test duration was 72 hrs except for tests in boilng 30% and 40%
solutions, which were of 48 hrs duration.
The alloy has shown moderate to poor resistance to hydrochloric acid.
Laboratory tests at 175 Degrees F have produced corrosion rates of 150 mpy (3.8 mm/yr)
at 10% concentration, 95 mpy (2.4 mm/yr) at 20% concentration, and 50 mpy (1.3
mm/yr) at 30% concentration. Inconel 617 has excellent resistance to phosphoric acid.
Inconel 617 has good fabricability. Forming, machining, and welding are carried
out by standard procedures for nickel alloys. Techniques and equipment for
some operations may be influenced by the alloy's strength and work-hardening
Hot and Cold Forming
Inconel 617 has good hot formability, but it requires relatively high forces
because of its inherent strength at elevated temperatures. In general, the
hot-forming characteristics of alloy 617 are similar to those of Inconel alloy
625. The temperature range for heavy forming or forging is 1850 to 2200
Degrees F .
Light working can be done at temperatures down to 1700 Degrees F. Inconel 617 is readily cold formed by conventional procedures although its
work-hardening rate is high. For best results , the alloy should be cold
formed in the fine-grain condition, and frequent intermediate anneals should
be used. Annealing for cold forming should be done at 1900 Degrees F.
Inconel 617 is normally used in the solution-annealed condition. That condition
provides a coarse grain structure for the best creep-rupture strength. It also
provides the best bend ductility at room temperature. Solution annealing is
performed at a temperature of 2150 Degrees F for a time commensurate with section
size. Cooling should be by water quenching or rapid air cooling.
Inconel 617 has excellent weldability. Inconel Filler Metal 617 is used for
gas-tungsten-arc and gas-metal-arc welding. The composition of the filler
metal matches that of the base metal, and deposited weld metal is comparable
to the wrought alloy in strength and corrosion resistance.
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