Alloy 718, Inconel 718, UNS N07718, 2.4688


Alloy 718, Inconel 718, UNS N07718, HAYNES 718, DIN 2.4688 is a high-strength, high-temperature resistant and corrosion resistant nickel-chromium alloy acc. to AMS 5589, AMS 5832, ASTM B637, GE B50TF14, PWA 1009

Alloy 718, Inconel 718, UNS N07718, 2.4688 - Introduction and Application

Alloy 718, Inconel 718, UNS N07718, HAYNES 718, DIN 2.4688 is a high-strength, high-temperature resistant and corrosion resistant nickel-chromium alloy. is an age hardenablenickel-chromium alloy having high creep-rupture strength at high temperatures to about 1300°F (700°C). The age-hardenable alloy can be readily fabricated into complex parts. Its welding characteristics,especially its resistance to postweld cracking, are outstanding.This alloy provides excellent high-temperature strength of up to 650°C (1202°F), formability, weldability, and good ductility. The following sections about super alloy HAYNES 718 will be discussed in detail below. mian use Nuclear hold down spring and other components, Gas turbine components, Springs, Seal rings, Cryogenic storage tanks, Gas turbine hot section components, Fasteners and instrumentation parts, Various components for oil/gas well down holes and well heads, Aircraft and land-based turbine engine components such as rings, casings, and formed sheet metal components.

Spec.

AMS 5589, AMS 5832, ASTM B637, GE B50TF14, GE B50TF15, AMS 5590, AMS 5664, ASTM B670, GE B50 TF69, PWA 1009, AMS 5596, AMS 5663, DIN 2.4668, GE B14H89, PWA 1010, AMS 5597, AMS 5662, DIN 2.4688, GE B50 TF14, PWA 1033, RBO 170-153, SPS M275, SPS M637

Forming

Alloy 718, Inconel 718, UNS N07718, HAYNES 718, DIN 2.4688 can be readily formed using all the traditional methods. As this alloy has high strength, powerful equipment has to be used. It is important that the material is properly cleaned of all traces of lubricant after forming to prevent embrittlement from occurring.


Forging

Forging can be done at 1121-926°C (2050-1700°F).

Annealing

Annealing of the material can be performed at 1037°C (1900°F) and then rapidly air cooled.


Hot Working

Hot working can be performed by heating the alloy to 1121-899°C (2050-1650°F). The alloy has to be reheated if hot working temperatures drop below 899°C (1650°F).


Cold Working

HAYNES 718 can be cold worked using all the traditional methods and tooling.


Aging

For aging HAYNES 718, anneal at 982°C (1800°F) and age at 718°C (1325°F) for 8 h. This should be followed by furnace cooling to 621°C (1150°F) and holding at that temperature for 10 h, and then air cooled.



Melted process

VIM + VAR


Alloy 718, Inconel 718, UNS N07718, 2.4688 - Chemical composition WT %

ElementWT %
Nickel, Ni50.00-55.00
Iron, FeBal
Chromium, Cr17.00-21.00
Niobium, Nb4.75-5.50
Tantalum, Ta
Molybdenum, Mo2.80-3.30
Cobalt, Co≤ 1.00
Titanium, Ti0.65-1.15
Aluminum, Al0.20-0.80
Manganese, Mn≤ 0.35
Silicon, Si≤ 0.35
Copper, Cu≤ 0.10
Carbon, C0.050
Boron, B0.0090

Mechanical Property of Alloy 718, Inconel 718, UNS N07718, 2.4688

PropertiesMetricImperial
Tensile strength1395 MPa202300 psi
Yield strength1175 MPa170400 psi
Elastic modulus200 GPa29000 ksi
Elongation at break22.3 %22.3 %

Annealed Typical

Ultimate Tensile Strength: 120 KSI min (827 MPa min)

Yield Strength: (0.2% offset) 60 KSI min (414 MPa min)

Elongation: 30% min ( gauges: > 0.040 inches)

-6

Properties:Tempered

Alloy 718 can be cold rolled to achieve the temper properties required by specific customers

and/or manufacturing requirements. Contact Ulbrich Wire for details.



Physical Property of Alloy 718, Inconel 718, UNS N07718, 2.4688

Density: 0.296 lbs/in³, 8.19 g/cm³

Specific Heat: Btu/lb °F (J/kg °C):

At 70°F (21°C): 0.104 (435)

Mean Coefficient of Thermal Expansion: in/in/° (mm/m/°C)

70-212°F (20-100°C): 7.6 x 10 (13.0)

Modulus of Elasticity: KSI (MPa)

29.7 x 10³ (204.9 x 10³) in tension

Magnetic Permeability, H = 200 Oersteds:

Annealed: 1.013

Annealed and Aged: 1.011

Melting Range: 2300-2437°F (1260-1336°C)



Heat Treatment of Alloy 718, Inconel 718, UNS N07718, 2.4688

Solution anneal at 1700-1850°F followed by rapid cooling, usually in water, plus precipitation hardening at 1325°F for 8hours, 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.



Welding of Alloy 718, Inconel 718, UNS N07718, 2.4688

Welding of Alloy 718, Inconel 718, UNS N07718, HAYNES 718, DIN 2.4688 can be performed using all the traditional welding methods. It is recommended that a matching alloy filler metal be used. Preheating is not required. The surfaces to be welded have to be free from oil, paint or crayon markings.


Machining of Alloy 718, Inconel 718, UNS N07718, 2.4688

Alloy 718, Inconel 718, UNS N07718, HAYNES 718, DIN 2.4688 can be machined using the common processes used for iron based alloys. The material work hardens during machining and has higher strength and gumminess. It is recommended that heavy duty machining equipment and tooling be used to reduce chatter. Commonly available commercial coolants can be used for the process.


Equivalent grades of Alloy 718, Inconel 718, UNS N07718, 2.4688

Alloy 718, Inconel 718, UNS N07718, HAYNES 718, DIN 2.4688


Alloy 718, Inconel 718, UNS N07718, 2.4688 Nickel and High Temperature Alloys stock list

Grade Shape Dimensionmm Qty.kg
Alloy 718 Round bar Φ14 217
Inconel 718 Round bar Φ16 527
UNS N07718 Round bar Φ20 489
718 Round bar Φ25 326
718 Round bar Φ35 265
718 Round bar Φ45 193
718 Round bar Φ55 315
718 Round bar Φ60 284
718 Round bar Φ65 242
718 Round bar Φ70 284
718 Round bar Φ80 308