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Inconel 718 Nickel Alloy Products High Tensile Strength Excellent Weldability

Inconel 718 Nickel Alloy Products High Tensile Strength Excellent Weldability

Brand Name : VANFORGE
Certification : ISO9001, ISO10012, ISO14001, OHSAS18001, ABS, BV, DNV, Lloyd, NK
Place of Origin : China
MOQ : 500 kg
Payment Terms : L/C, T/T
Supply Ability : 50 metric tons per month
Delivery Time : 60 days
Packaging Details : Seaworthy package for export
Price : Negotiable
Material : Inconel 718
Process : Open die forged
Treatment : Annealed, or precipitation hardened
Surface : Peeled
Shape : Round
Length : Cut to length on request
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Forged high strength corrosion resistant nickel alloy Inconel 718 round bar​


INCONEL® alloy 718 (UNS N07718/W.Nr. 2.4668) is a high-strength, corrosion-resistant nickel chromium material used at -423° to 1300°F.


The age-hardenable alloy can be readily fabricated, even into complex parts. Its welding characteristics, especially its resistance to postweld cracking, are outstanding.


The ease and economy with which INCONEL alloy 718 can be fabricated, combined with good tensile, fatigue, creep, and rupture strength, have resulted in its use in a wide range of applications. Examples of these are components for liquid fueled rockets, rings, casings and various formed sheet metal parts for aircraft and land-based gas turbine engines, and cryogenic tankage. It is also used for fasteners and instrumentation parts.


Chemical composition, %

Nickel (plus Cobalt) .......................................................50.00-55.00

Chromium......................................................................17.00-21.00

Iron .....................................................................................Balance

Niobium (plus Tantalum)....................................................4.75-5.50

Molybdenum .....................................................................2.80-3.30

Titanium.............................................................................0.65-1.15

Aluminum ..........................................................................0.20-0.80

Cobalt ...............................................................................1.00 max.

Carbon..............................................................................0.08 max.

Manganese .......................................................................0.35 max.

Silicon ...............................................................................0.35 max.

Phosphorus.....................................................................0.015 max.

Sulfur...............................................................................0.015 max.

Boron ..............................................................................0.006 max.

Copper..............................................................................0.30 max.


Heat treating and mechanical properties

For most applications, INCONEL alloy 718 is specified as: solution annealed and precipitation hardened (precipitation hardening, age hardening, and precipitation heat treatment are synonymous terms). Alloy 718 is hardened by the precipitation of secondary phases (e.g. gamma prime and gamma double-prime) into the metal matrix. The precipitation of these nickel- (aluminum, titanium, niobium) phases is induced by heat treating in the temperature range of 1100 to 1500°F. For this metallurgical reaction to properly take place, the aging constituents (aluminum, titanium, niobium) must be in solution (dissolved in the matrix); if they are precipitated as some other phase or are combined in some other form, they will not

precipitate correctly and the full strength of the alloy with not be realized. To perform this function, the material must first be solution heat treated (solution annealed is a synonymous term).


Two heat treatments are generally utilized for INCONEL alloy 718:

•Solution anneal at 1700-1850°F followed by rapid cooling, usually in water, plus precipitation hardening at 1325°F for 8 hours, furnace cool to 1150°F, hold at 1150°F for a total aging time of 18 hours, followed by air cooling.

•Solution anneal at 1900-1950°F followed by rapid cooling, usually in water, plus precipitation hardening at 1400°F for 10 hours, furnace cool to 1200°F, hold at 1200°F for a total aging time of 20 hours, followed by air cooling.


If the material is to be machined, formed, or welded, it typically is purchased in the mill annealed or stress relieved condition. The material is then fabricated in its most malleable condition. After fabrication, it can be heat treated as required per the applicable specification.


1700°-1850°F Anneal and Age

The 1700°-1850°F anneal with its corresponding aging treatment as shown earlier is the optimum heat treatment for alloy 718 where a combination of rupture life, notch rupture life and rupture ductility is of greatest concern. The highest room-temperature tensile and yield strengths are also associated with this treatment. In addition, because of the fine grain developed, it produces the highest fatigue strength.


1900°-1950° Anneal and Age The 1900°-1950° anneal with its corresponding aging treatment as shown above is the treatment preferred in tensile-limited applications because it produces the best transverse ductility in heavy sections, impact strength, and low-temperature notch tensile strength. However, this treatment has a tendency to produce notch brittleness in stress rupture.


Bolting

INCONEL alloy 718 combines excellent mechanical properties over a wide temperature range with superior oxidation and corrosion resistance. Because of these properties it is specified for many fastener applications where superior performance is required under varying environmental conditions.


INCONEL alloy 718 can be strengthened in two ways:

(1) by solution treating and age hardening or (2) by cold working and age hardening only.


The use of alloy 718 for bolting applications is addressed under Section I and Section VIII, Division I of the ASME Code by Code Case 1993.


Metallography

INCONEL alloy 718 is an age-hardenable austenitic material. Strength is largely dependent on the precipitation of a gamma prime phase during heat treatment.


A major part of the development effort with this alloy was concerned with establishment of the proper heat treatments for producing optimum properties. These heat treatments and the applications for which they are intended are described in the section, Mechanical Properties.


The microstructure of alloy 718, especially with regard to the effects of heat treatment, has been extensively studied and reported. The literature should be consulted for detailed discussions on the various phases developed by various heat treatments and other metallurgical investigations.


Corrosion resistance

INCONEL alloy 718 has excellent corrosion resistance to many media. This resistance, which is similar to that of other nickel-chromium alloys, is a function of its composition. Nickel contributes to corrosion resistance in many inorganic and organic, other than strongly oxidizing, compounds throughout wide ranges of acidity and alkalinity. It also is useful in combating chloride-ion stress-corrosion cracking. Chromium imparts an ability to withstand attack by oxidizing media and sulfur compounds. Molybdenum is known to contribute to resistance to pitting in many media.


Heating and Pickling

When INCONEL alloy 718 is heated care must be taken to maintain both the furnace and the material being heated at correct temperatures.


Fuels used for heating must be extremely low in sulfur. The alloy must be absolutely clean and free from all oil, paint, grease, and shop soil when charged into the furnace.


The furnace atmosphere for forging or open annealing should be slightly reducing, containing at least 2% carbon monoxide. A slight positive pressure should be maintained in the furnace to prevent air infiltration.


When alloy 718 is heated in a reducing atmosphere, a thin, adherent green-black film of oxide will be left on the surface of the material. In oxidizing atmospheres, a heavy black scale is produced that is very difficult to remove. Every precaution should be taken in heating so that only the green-black film is formed.


Hot Forming

Because of its strength, INCONEL alloy 718 is more resistant than most materials to deformation during hot forming. Its relative resistance is shown by pressures developed in the roll gap at 20% reduction. It is readily hot-worked if sufficiently powerful equipment is used.


Hot forming is performed in the 1650°-2050°F temperature range. In the last operation, the metal should be worked uniformly with a gradually decreasing temperature, finishing with some light reduction in the 1650°-1750°F range. This procedure is necessary to ensure notch ductility in stress-rupture applications when material has been annealed and aged. (See below). In heating for hot working, the material should be brought up to temperature, allowed to soak a short time to ensure uniformity, and withdrawn.


To avoid duplex grain structure INCONEL alloy 718 should be given uniform reductions. Final reductions of 20% minimum should be used for open-die work and 10% minimum for closed-die work. Parts should generally be air cooled from the hot-working temperature rather than water quenched.


Care should be taken to avoid overheating the metal by heat buildup due to working. Also, the piece should be reheated when any portion has cooled below 1650°F. Preheating tools and dies to 500°F is recommended. Any ruptures appearing on the surface of the workpiece must be removed at once.


Cold Forming

INCONEL alloy 718 can be cold-formed by standard procedures used for steel and stainless steel.


Super-Plastic Forming

A special grade of alloy 718 that is specifically designed for the super-plastic forming process is manufactured by Special Metals. This alloy, designated INCONEL alloy 718SPF, is available as annealed sheet in thicknesses from 0.02 to 0.08 inches (0.5 to 2.0 mm) in widths up to 36 inches (914 mm). The specification SAE AMS 5950 was developed to define the requirements for the alloy.


Available products and specifications

INCONEL alloy 718 is designated at UNS N07718, UNS N07719, and Werkstoff Nr. 2.4668. It is listed in NACE MR-01-75 for oil and gas service. Alloy 718 is available as pipe,

tube, round bar, flat bar, forging, hexagon, wire and extruded section.


Rod, Bar and Forging Stock - ASTM B 637, ASME SB 637, SAE AMS 5662, SAE AMS 5663, SAE AMS 5664, SAE AMS 5832, SAE AMS 5914, SAE AMS 5962, ASME Code Case 1993, ASME Code Case 2206, ASME Code Case 2222, AECMA PrEN 2404, AECMA PrEN 2405, AECMA PrEN 2952, AECMA PrEN 2961, AECMA PrEN 3219, AECMA PrEN 3666, ISO 9723, ISO 9724, ISO 9725, DIN 17752-17754


Pipe and Tube - SAE AMS 5589, SAE AMS 5590, ASME Code Case N-253, DIN 17751


Product size range
Diameter: 100mm - 600mm
Length: on request

Production Process










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