Inconel 718
Table of Content
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Inconel 718 is a nickel-chromium-molybdenum alloy designed to withstand severe corrosive environments, pitting, and crevice corrosion. Additionally, this nickel steel alloy exhibits excellent yield, tensile, and creep-rupture properties at high temperatures. Whether you are using this nickel alloy at cryogenic temperatures or at 1200° F for long periods of time, it will meet your needs. The addition of niobium to Inconel 718’s composition allows age hardening, which allows annealing and welding without spontaneous hardening.
The addition of niobium stiffens the alloy’s matrix and provides high strength without a strengthening heat treatment. By adding aluminum and titanium, nickel-chromium alloys can also be age-hardened.
Nickel steel alloys are readily fabricated and can be welded either annealed or precipitation hardened. Many industries use this superalloy, including aerospace, chemical processing, marine engineering, pollution control, and nuclear power.
Nickel-chromium alloy Inconel® 718 contains significant amounts of iron, columbium, and molybdenum, along with a lesser amount of aluminum and titanium. 718 materials are strong and ductile up to 1300°F (704°C). In comparison to other precipitation hardening nickel alloys, this alloy has relatively good weldability, formability, and cryogenic properties. Due to its slow precipitation hardening response, this alloy can be readily welded without hardening or cracking. There is no magnetic property to Inconel® Alloy 718. It is used for parts that require high creep and stress rupture resistance up to 1300°F (704°C) and oxidation resistance up to 1800°F (982°C).
In addition to exhibiting exceptional yield, tensile, and creep-rupture properties at temperatures up to 1300°F, alloy 718 exhibits a sluggish age-hardening response. In addition to exhibiting exceptional yield, tensile, In addition to exhibiting exceptional yield, tensile, and creep-rupture properties at temperatures up to 1300°F, alloy 718 exhibits a sluggish age-hardening response.and high temperature bolts and fasteners.
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Specifications Of Inconel 718
Specification | ASTM B637 UNS N07718, ASTM B 637 / ASME SB 637, Inconel Alloy 718 AMS 5662, AMS 5663, AMS 5664, PWA 1009 PWA 1010 GE B50TF15 |
Grade | Inconel 718 – UNS N07718 |
UNS N07718 Hex Bar size | 2-100mm A/F |
ASTM B637 Alloy 718 Round bar size | Diameter: 3-~800mm |
ASTM B637 Alloy 718 Square bar size | 4 to 100mm |
N07718 Flat bar size | Thickness: 2 -100mm |
Width: 10 to 500mm | |
Alloy 718 Rectangles Size | 33 x 30mm to 295 x 1066mm |
ASTM B637 N07718 Angle bar size | 3mm*20mm*20mm~12mm*100mm*100mm |
UNS N07718 Section | 3.0 to 12.0mm thickness |
Inconel 718 AMS 5666 Channel Bar | 80 x 40mm to 150 x 75mm section; 5.0 to 6.0mm thickness |
N07718 Hollow Bar | 32mm OD x 16mm ID to 250mm OD x 200mm ID) |
ASTM B637 N07718 Billet Size | 1/2″ to 495mm Diameter |
Round Bar Standard Dimensions | Diameter / Height: |
Finish | Cold (bright) drawn, centreless ground, hot rolled, smooth turned, peeled, slit rolled edge, hot rolled annealed, Rough Turned, Bright, Polish, Grinding, Centreless Ground & Black |
Tolerance | H8, H9, H10, H11, H12, H13K9, K10, K11, K12 or as per clients’ requirements |
Surface | Hot Rolled Pickled, Bright, Sand Blasting Finished, Cold Drawn, Hairline, Polished |
Condition | Hardened & tempered, annealed |
Technique | Inconel 718 Cold Drawn, Hot Rolled, Forged Round Bar,Cold Rolled, Rod |
Processing | Bar cutting to 650mm |
Form | Inconel 718 Round, Welding Rod, T-Bar, Rod, Precision Ground Bar, Channel Bar, Square, Flat Bar, Blocks, Round Rod, Hollow, Rings, Rectangle, Hex (A/F), Triangle, Threaded, Profiles, Billet, Ingot, I/H Bar, Half Round Bar, Forging etc. |
Our stockyad location for fast delivery across India | Hyderabad, Noida, Shivamogga, Pimpri-Chinchwad, Agra, Coimbatore, Chennai, Tiruchirappalli, Tirunelveli, Bhubaneswar, Mumbai, Pune, Bengaluru, Ahmedabad, Thiruvananthapuram, Dhanbad, Navi Mumbai |
Our Inconel 718 Round bar conforms to NACE MR0175/ISO 15156 |
Chemical Composition Of Inconel 718
Carbon | 0.08 max |
Manganese | 0.35 max |
Phosphorus | 0.015 max |
Sulfur | 0.015 max |
Silicon | 0.35 max |
Chromium | 17-21 |
Nickel | 50-55 |
Molybdenum | 2.80-3.30 |
Columbium | 4.75-5.50 |
Titanium | 0.65-1.15 |
Aluminum | 0.20-0.80 |
Cobalt | 1.00 max |
Boron | 0.006 max |
Copper | 0.30 max |
Tantalum | 0.05 max |
Iron | Balance |
Physical Constants Of Inconel 718
Density | Annealed: 0.296 lb/in3 |
Annealed and aged: 0.297 lb/in3 | |
Melting Point Range | 2300° to 2437°F (1260° to 1336°C) |
Specific Heat at 21 Deg C (70°F) | 0.104 Btu/lb-°F |
Permeability at 200 oersted and 21 Deg C (70°F) | Annealed material: 1.0013 |
Annealed and aged material: 1.0011 | |
Curie Temperature Deg C (°F) | Annealed material: <-320°F (<-196°C) |
annealed and aged material: -170°F (-112°C) |
Properties Of Inconel 718
Temperature resistance
Due to its melting point of 1430°C, Inconel 718 is highly resistant to heat and high temperatures, as well as working well at cryogenic temperatures.
Natural heat protection
When exposed to heat, this nickel superalloy forms a strong and stable oxide layer, providing natural passivation.
Corrosion resistance
As a result of its protective oxide layer, this Inconel variant is highly resistant to oxidation.
High mechanical strength
When Inconel 718 undergoes solution and precipitation treatment, it exhibits a minimum yield strength of 725 MPa and a maximum tensile strength of 1035 MPa.
Exceptional welding quality
In contrast to other Inconel alloys, Inconel 718 has been designed to address this issue, regardless of whether electron beams or arcs are used to weld it.
Good malleability and machining quality
There is a difference between Inconel 718 and most Inconel alloys. Inconel 718 is easier to machine when using a hard cutting implement and a slower cutting mechanism.
This superalloy can be threaded by induction heating at 700°C after it has been fully aged.
Production and processing
The following processes can be used to produce Inconel 718:
- The metal is heated and then gradually brought down to a lower temperature through annealing. This gives the metal its strength and resistance to stress.
- By adding impurities before heating, precipitation hardening, also known as age hardening, increases the alloy’s strength.
The process of annealing, or solid solution strengthening, involves completely dissolving metal components so that they will precipitate properly to give Inconel 718 its strength.
During precipitation strengthening, nickel and niobium combine to form gamma double prime (or Ni3Nb).
When machined above 540°C, Inconel 718 can be shaped and oriented in custom ways.
Modulus of Elasticity (E) Inconel 718
Temperature |
psi x 10(6) |
MPa x 10(3) |
|
°F |
°C |
||
70 200 400 600 800 1000 1200 1400 1600 1750 |
21 93 204 316 427 538 649 760 871 954 |
29.6 29.2 28.8 27.6 26.5 25.5 24.5 23.1 18.1 11.1 |
208 205 202 194 186 179 172 162 127 78 |
Coefficient of Thermal Expansion Inconel 718
Temperature Range |
10(-6)/°F |
10(-6)/°C |
77°F to |
25°C to |
200 400 600 800 1000 1200 1400 |
93 204 316 427 538 649 760 |
7.1 7.5 7.7 7.9 8.0 8.4 8.9 |
12.8 13.5 13.9 14.2 14.4 15.1 16.0 |
Heat Treatment Of Inconel 718
For the best combination of tensile and stress rupture properties, use the following heat treatment:
1 hour 1750°F to 1800°F (954 to 982°C) air cool + 8hrs 1325°F (718°C) cool 100°F/hr to 1150°F (56 °C/hr to 621°C), hold 8 hours and air cool.
In order to achieve the best cryogenic tensile properties at room temperature, the following heat treatment should be applied:
1950°F (1066°C), air cool + 8 hr 1325°F (718°C) cool 100°F/hr to 1150°F (56°C/hr to 621°C), hold for 8 hours, and air cool.
Workability Of Inconel 718
Hot Working
For hot-working, the maximum temperature is 2050°F (1121°C). If the service temperature is below about 1100°F (593°C), hot-cold working in the range 1700/1850°F (927/1010°C) will improve the strength of the forging. Prolonged soaking at the forging temperature is not desirable. It is important to reduce the material uniformly to prevent duplex grain structures from forming.
Machining
The alloy can be machined in either annealed or age-hardened conditions. The age-hardened condition gives better chip action on chip breaking tools, while the annealed condition will give a slightly longer tool life
Welding
Welding alloy 718 in the aged condition will cause a softened heat-affected zone to form.
Inconel 718 Bar Price
Inconel 718 Bar Price in India |
Quantity |
Price in USD $ |
Alloy 718 AMS 5663 Rod 30.0 Dia x 100mm long |
1 |
$118.02 |
Alloy 718 AMS 5663 Rod 30.0 Dia x 100mm long |
2 |
$198.11 |
Alloy 718 AMS 5663 Rod 30.0 Dia x 100mm long |
3 |
$269.76 |
Alloy 718 AMS 5663 Rod 30.0 Dia x 250mm long |
1 |
$217.78 |
Alloy 718 AMS 5663 Rod 30.0 Dia x 250mm long |
2 |
$386.38 |
Alloy 718 AMS 5663 Rod 30.0 Dia x 250mm long |
3 |
$531.09 |
Alloy 718 AMS 5663 Rod 30.0 Dia x 500mm long |
1 |
$386.38 |
Alloy 718 AMS 5663 Rod 30.0 Dia x 500mm long |
2 |
$609.77 |
Alloy 718 AMS 5663 Rod 30.0 Dia x 500mm long |
3 |
$833.17 |
Alloy 718 AMS 5663 Rod 30.0 Dia x 1000mm long |
1 |
$519.85 |
Condition Of Inconel 718
H&T |
Hardened and tempered. |
ANN |
Annealed |
PH |
Precipitation hardened. |
718 Inconel Bar Surface finish
CD |
Cold drawn |
P |
Polished |
BD |
Bright drawn |
SRE |
Slit rolled edge |
CG |
Centreless ground |
HF |
Hot finished |
CF |
Cold finished |
HRAP |
Hot rolled annealed and pickled |
P&T |
Peeled and turned |
RT |
Rough turned/peeled |
ST |
Smooth turned |
PR |
Peeled and reeled |
718 Inconel Bar Sizes
Type |
SIZES (mm) |
SIZES (Inches) |
ISO Tolerance |
Cold Drawn and Polish |
3.00 – 75.00 |
1/8 – 3.00 |
h8-h9-h10-h11 |
Cold Drawn and Ground |
10.00 – 75.00 |
5/6 – 2.50 |
h8-h9-h10-h11 |
Peeled and Polished |
40.00 – 150.00 |
1.50 – 6.00 |
h11, h11-DIN 1013 |
Peeled and Ground |
20.00 – 50.00 |
3/4 – 2.00 |
h9-h10-h11 |
Standard lengths of Inconel 718 bars are 2010 mm to 7180 mm. Cut to size is available (tolerance +2/-0 mm).
5.0 |
45.0 |
6.0 |
50.0 |
7.0 |
55.0 |
8.0 |
60.0 |
9.0 |
65.0 |
10.0 |
70.0 |
12.0 |
75.0 |
16.0 |
80.0 |
20.0 |
90.0 |
25.0 |
100.0 |
30.0 |
130.0 |
35.0 |
160.0 |
40.0 |
201.0 |
Workability Of Inconel 718
- Sheet
- Plate
- Bar
- Wire
Overview
Gamma Prime strengthened Inconel 718 has excellent mechanical properties at elevated temperatures, as well as cryogenic temperatures. Suitable for temperatures up to around 1300 F, it can be readily worked.
Strength from -423 degrees F to 1300 degrees F (-253 degrees C to 705 degrees C). Age hardenable and can be welded in fully aged condition. Excellent oxidation resistance up to 1800 degrees F (980 degrees C). Generally sold in solution annealed temper, but available aged, cold worked, or cold worked & aged tempers.
Applications of Inconel 718
3d Printing
As a result of its ability to print parts and components for a variety of industries, Inconel 718 has become synonymous with 3D printing technology. Several studies have looked into the use of the superalloy in the additive manufacturing (AM) industry and further enhancements to maximize its features.
Gas Turbine Engine Parts
Superalloys have become integral parts of gas turbine engines due to their weldability and heat resistance.
Aerospace And Aircraft Manufacturing
Inconel 718 has become widely used in turbojet engine parts such as compressor casings, discs, and fan blades because of its strength and resistance. Because of its high heat resistance, Inconel 718 has also found its way into rocket engine production. This is why about half of the components in conventional aircraft engines are made of Inconel 718.
Die Casting
This Inconel variant works well in hot environments, making it ideal for extreme heat applications such as metal die casting. While other non-ferrous metals are more popular in this industry, Inconel 718 is tough enough to resist damage. As a result, dies and die holders made of Inconel 718 last longer and resist deformation better.
What are the characteristics of Inconel 718?
- Tensile, fatigue, and creep-rupture properties are good
- Properties such as yield tensile strength, creep, and rupture strength are extremely high
- Stress corrosion cracking resistant to chloride and sulfide
- Aqueous corrosion and chloride ion stress corrosion cracking-resistant
- Resistant to high temperatures
- It is age-hardenable with a slow aging response that permits heating and cooling during annealing without cracking.
- Excellent welding characteristics, resistant to cracking after welding
Features of Inconel 718 round bar:
-
- Exceptional resistance to oxidation
- Formability and weldability are good
- Oxidation resistance is excellent
- Cryogenic properties that are good