Nickel Alloy 718/ Inconel 718®


Technical Data Sheet

 

Chemical Composition Limits

Weight %

C

Mn

P

S

Si

Cr

Ni

Mo

Cb

Ta

Ti

Al

Co

B

Cu

Fe

Alloy 718
AMS 5662

0.08

0.35

0.015

0.015

0.35

17-21

50-55

2.8-3.30

4.75-5.50

0.05

0.65-1.15

0.20-0.80

1.00

0.006

0.30

Rem

Alloy 718 (UNS N07718, W Nr 2.4668) is an austenitic nickel-based superalloy. Alloy 718 exhibits excellent high yield tensile and creep-rupture properties at temperatures up to 1300ºF and oxidation resistance to 1800ºF. Alloy 718 is used in applications that require high strength such as parts for jet engines and high speed airframe parts such as wheels, buckets, spacers and high temperature bolts and fasteners.

Typical Mechanical Properties

There are two main types of solution annealed and aging treatments:
1) 
Solution Treatment (AMS 5662 Bar / AMS 5596 Sheet): 1725°F - 1850°F + Air Cool.
Heat Treatment (AMS 5663 Bar) : 1325°F for 8 hrs, cooling 100°F/hr to 1150°F, hold at 1150°F for 8hrs min, + Air Cool .

This treatment gives the highest room temperature tensile and yield strengths as well as producing the highest fatigue strength. It is the optimum heat treatment for Alloy 718 where a combination of rupture life, notch rupture life and rupture ductility is required.

2) 
Alternative Solution Treatment (AMS 5664 Bar / AMS 5597 Sheet): 1900°F - 1950°F + Air Cool
Heat Treatment: 1400°F for 10hrs, furnace cool to 1200°F, hold at 1200°F for a total aging time of 20 hrs + Air Cool.

This is the prefered treatment in tensile-limited applications as 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.

Material

Condition

Tensile Strength
ksi

Yield Strength
ksi

Elongation
4D

Reduction of Area
%

Hardness

AMS 5662 Bar

1700-1850°F Anneal

-

-

-

-

≤ 277 HB

AMS 5663 Bar

1700-1850°F Anneal + Age

185

150

12

15

≥331 HB

AMS 5664 Bar

1900-1950°F Anneal

-

-

-

-

3" dia 248 HB
3-5" dia 285 HB

 

1900-1950°F Anneal + Age

180

150

10

12

≥341 HB

Typical Mechanical Properties of Alloy 718 Bar above and Alloy 718 Sheet below.

Material

Condition

Tensile Strength
ksi

Yield Strength
ksi

Elongation
4D

Hardness

Alloy 718 Sheet

AMS 5596 < 0.1874" thick

140

80

30

102 HRB

Alloy 718 Sheet

AMS 5596 Aged < 0.1874" thick

180

150

12

≥36 HRC

Alloy 718 Sheet

AMS 5597

140

75

30

≤ 25 HRC

Alloy 718 Sheet

AMS 5597 + Aged

180

150

15

≥38 HRC

Specifications
UNS N07718
Werkstoff Nr 2.4668
AMS 5596 Sheet, Strip and Plate
AMS 5597 Sheet, Strip and Plate
AMS 5589 Seamless Tube
AMS 5590 Seamless Tube
AMS 5662 Bars, Forgings and Rings
AMS 5663 Bars, Forgings and Rings
AMS 5664 Bars, Forgings and Rings

AMS 5832 Welding Wire
ASTM B637 Forgings
ASTM B670 Plate, Sheet and Strip
AFNOR NC 19 Fe Nb, 
MSRR 7115 and MSRR 7116 
Inconel 718 (trademark) 
FMC Spec M40110, M40118, M40125, M40902, M40908, M40909, M40910
NACE MR-0175/ISO 15156 

 

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Inconel

 

Inconel is a family of austenite nickel-chromium-based superalloys. The name is a trademark ofSpecial Metals Corporation, a wholly owned subsidiary of Precision Castparts Corp.

Inconel alloys are oxidation and corrosion resistant materials well suited for service in extreme environments subjected to pressure and heat. When heated, Inconel forms a thick, stable,passivating oxide layer protecting the surface from further attack. Inconel retains strength over a wide temperature range, attractive for high temperature applications where aluminum and steel would succumb to creep as a result of thermally induced crystal vacancies. Inconel’s high temperature strength is developed by solid solution strengthening or precipitation strengthening, depending on the alloy.

Inconel alloys are typically used in high temperature applications. It is sometimes referred to in English as "Inco" (or occasionally "Inconel"). Common trade names for Inconel Alloy 625 include: Inconel 625, Chronin 625, Altemp 625, Haynes 625, Nickelvac 625 and Nicrofer 6020. 

Composition

Different Inconels have widely varying compositions, but all are predominantly nickel, with chromium as the second element.

Inconel

Element (% by mass)

Ni

Cr

Fe

Mo

Nb

Co

Mn

Cu

Al

Ti

Si

C

S

P

B

600 

72.0

14.0-17.0

6.0-10.0

     

1.0

0.5

   

0.5

0.15

0.015

   

617 

44.2-56.0

20.0-24.0

3.0

8.0-10.0

 

10.0-15.0

0.5

0.5

0.8-1.5

0.6

0.5

0.15

0.015

0.015

0.006

625 

58.0

20.0-23.0

5.0

8.0-10.0

3.15-4.15

1.0

0.5

 

0.4

0.4

0.5

0.1

0.015

0.015

 

690 

59.5

30

9.2

     

0.35

0.01

0.02

 

0.35

0.019

0.003

   

718 

50.0-55.0

17.0-21.0

balance

2.8-3.3

4.75-5.5

1.0

0.35

0.2-0.8

0.65-1.15

0.3

0.35

0.08

0.015

0.015

0.006

X-750

70.0

14.0-17.0

5.0-9.0

 

0.7-1.2

1.0

1.0

0.5

0.4-1.0

2.25-2.75

0.5

0.08

0.01

   

Properties

Inconel alloys are oxidation- and corrosion-resistant materials well suited for service in extreme environments subjected to high pressure and kinetic energy. When heated, Inconel forms a thick and stable passivating oxide layer protecting the surface from further attack. Inconel retains strength over a wide temperature range, attractive for high-temperature applications where aluminium and steel would succumb to creep as a result of thermally induced crystal vacancies (see Arrhenius equation). Inconel's high temperature strength is developed by solid solution strengthening or precipitation strengthening, depending on the alloy. In age-hardening or precipitation-strengthening varieties, small amounts of niobiumcombine with nickel to form the intermetallic compound Ni3Nb or gamma prime (γ'). Gamma prime forms small cubic crystals that inhibit slip and creep effectively at elevated temperatures. The formation of gamma-prime crystals increases over time, especially after three hours of a heat exposure of 850 °C, and continues to grow after 72 hours of exposure.

Machining

Inconel is a difficult metal to shape and machine using traditional techniques due to rapidwork hardening. After the first machining pass, work hardening tends to plastically deform either the workpiece or the tool on subsequent passes. For this reason, age-hardened Inconels such as 718 are machined using an aggressive but slow cut with a hard tool, minimizing the number of passes required. Alternatively, the majority of the machining can be performed with the workpiece in a solutionized form, with only the final steps being performed after age hardening.

External threads are machined using a lathe to "single-point" the threads or by rolling the threads in the solution treated condition (for hardenable alloys) using a screw machine. Inconel 718 can also be roll-threaded after full aging by using induction heat to 1300 °F without increasing the grain size. Holes with internal threads are made by threadmilling. Internal threads can also be formed using a sinker EDM (electrical discharge machining).

Cutting of a plate is often done with a waterjet cutter. New whisker-reinforced ceramic cutters are also used to machine nickel alloys. They remove material at a rate typically eight times faster than carbide cutters. Apart from these methods, Inconel parts can also be manufactured by selective laser melting.

Joining

Welding of some Inconel alloys (especially the gamma prime precipitation hardened family,e.g. Waspalloy and X-750) can be difficult due to cracking and microstructural segregation of alloying elements in the heat-affected zone. However, several alloys such as 625 and 718 have been designed to overcome these problems. The most common welding methods are gas tungsten arc welding and electron beam welding.

Innovations in pulsed micro laser welding have also become more popular in recent years for specific applications.

Uses

Inconel is often encountered in extreme environments. It is common in gas turbine blades, seals, and combustors, as well as turbocharger rotors and seals, electric submersible well pump motor shafts, high temperature fasteners, chemical processing and pressure vessels,heat exchanger tubing, steam generators and core components in nuclear pressurized water reactors,[13] natural gas processing with contaminants such as H2S and CO2firearmsound suppressor blast baffles, and Formula OneNASCAR and APR, LLC exhaust systems  It is also used in the turbo system of the 3rd generation Mazda RX7, and the exhaust systems of high powered rotary engined Norton motorcycles where exhaust temperatures reach more than 1,000 degrees C.[16] Inconel is increasingly used in the boilers of waste incinerators. The Joint European Torus and DIII-D (fusion reactor)tokamaks vacuum vessels are made in Inconel. Inconel 718 is commonly used for cryogenic storage tanks, downhole shafts and wellhead parts.

Several applications of inconel in aerospace include:

·         North American Aviation constructed the skin of the North American X-15 Rocket-powered aircraft out of an Inconel alloy known as "Inconel X".

·         Rocketdyne used Inconel X-750 for the thrust chamber of the F-1 rocket engine used in the first stage of the Saturn V booster.

·         SpaceX uses inconel in the engine manifold of their Merlin rocket engine which powers the Falcon 9 launch vehicle.

·         In a first for 3D printing, the SpaceX SuperDraco engine that provides launch escape system and propulsive-landing thrust for the Dragon V2 crew-carrying space capsule is fully printed, the first fully printed rocket engine. In particular, the engine combustion chamber is printed of Inconel using a process of direct metal laser sintering, and operates at a chamber pressure of 6,900 kilopascals (1,000 psi) at a very high temperature.

Tesla Motors is now using Inconel, in place of steel, to upgrade the main battery pack contactor in its Model S so that it remains springy under the heat of heavy current. Teslaclaims that this allows upgraded vehicles to safely increase the max pack output from 1300 to 1500 Amps, allowing for an increase in power output (acceleration) Tesla refers to as "Ludicrous Mode."

Rolled Inconel was frequently used as the recording medium by engraving in black boxrecorders on aircraft.

Alternatives to the use of Inconel in chemical applications such as scrubbers, columns, reactors, and pipes are Hastelloyperfluoroalkoxy (PFA) lined carbon steel or fiber reinforced plastic.

The exhaust valves on NHRA Top Fuel and Funny Car drag racing engines are made of Inconel. Iconel is also used in the manufacture of exhaust valves in high performance aftermarket turbo and Supercharged Mazda Miata engine builds (see Flying Miata INC).

Inconel alloys

Alloys of inconel include:

·         Inconel 600: Solid solution strengthened

·         Inconel 625: Acid resistant, good weldability. The LCF version is typically used in bellows.

·         Inconel 690: Low cobalt content for nuclear applications, and low resistivity

·         Inconel 713C: Precipitaion hardenable nickel-chromium base cast alloy

·         Inconel 718: Gamma double prime strengthened with good weldability

·         Inconel 751: Increased aluminium content for improved rupture strength in the 1600 °F range

·         Inconel 792: Increased aluminium content for improved high temperature corrosion properties, used especially in gas turbines

·         Inconel 939: Gamma prime strengthened to increase weldability

In age hardening or precipitation strengthening varieties, alloying additions of aluminum and titanium combine with nickel to form the intermetallic compound Ni3(Ti,Al) or gamma prime (γ’). Gamma prime forms small cubic crystals that inhibit slip and creep effectively at elevated temperatures.

Availability:

 

 

 
 

INCONEL 718 Plate

INCONEL 718 Fittings

INCONEL 718 Tube / Pipe

 

 

 

 

 

INCONEL 718 Bar

INCONEL 718 Sheet

INCONEL 718 Coil /Strap

 

 

 

 

 

INCONEL 718 Fasteners / Flanges

INCONEL 718 Powder

INCONEL 718 Welding Product

 

 

 

 

 

 

 

Provide all grade of these alloy by different shape & size is Our expertise

For any inquiry & request, don't hesitate to contact us

Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.