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How Much Do You Know About The Knowledge Of 718?
Nov 12, 2018

ALLOY 718 DESCRIPTION


Alloy 718 is Associate in Nursing age hardenablenickel-chromium alloy having high creep-rupture strength at high temperatures to concerning 1300°F (700°C). The age-hardenable alloy will be promptly made-up into advanced components. Its fastening characteristics,especially its resistance to postweld cracking, are outstanding.

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APPLICATIONS


Nuclear hold down spring and different elements

Gas turbine elements

Springs

Seal rings



CHEMISTRY TYPICAL


Nickel + Cobalt: fifty.00 – 55.00

Chromium: seventeen.00 – 21.00

Molybdenum: a pair of.80 – 3.30

Columbium + Tantalum: four.75 – 5.50

Titanium: zero.65 – 1.15

Aluminum: zero.20 – 0.80

Cobalt: 1.00 max

Carbon: 0.80 max

Manganese: zero.35 max

Silicon: 0.35 max

Phosphorus: zero.015 max

Sulfur: 0.015 max

Boron: 0.006 max

Copper: 0.30 max

Iron: Balance



PHYSICAL PROPERTIES


Density: 0.296 lbs/in³, 8.19 g/cm³



Specific Heat: Btu/lb °F (J/kg °C):

At 70°F (21°C): zero.104 (435)



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

70-212°F (20-100°C): seven.6 x 10 (13.0)



Modulus of Elasticity: KSI (MPa)

29.7 x 10³ (204.9 x 10³) in tension



Magnetic porousness, H = two hundred Oersteds:



Annealed: one.013



Annealed and Aged: one.011



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



MECHANICAL PROPERTIES AT temperature

ANNEALED TYPICAL

Ultimate Tensile Strength: one hundred twenty KSI min (827 MPa min)

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



Elongation: thirtieth min ( gauges: > zero.040 inches)

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PROPERTIES:TEMPERED

Alloy 718 will be cold rolled to realize the temper properties needed by specific customers and/or producing necessities. 

HEAT TREAT CAPABILITIES

Two heat treatments are typically used for Alloy 718 resolution temper at 1700-1850°F followed by fast cooling, typically in water, and precipitation hardening at 1325°F for 8hours, chamber cool to 1150°F, hold at 1150°F

for a complete aging time of eighteen hours, followed by air cooling.

Solution temper at 1900-1950°F followed by fast cooling, typically in water, and precipitation hardening at 1400°F for ten hours, chamber cool to 1200°F, hold at 1200°F for a complete aging time of twenty hours, followed by air cooling.

ADDITIONAL PROPERTIES

CORROSION RESISTANCE

STANDARD WIRE FINISHES

Extra Clean: (XC) further clean is additionally observed as “bright treated” or “bright annealed and cold rolled”

Grease (round wire only): Drawn AN exceedingly|in a very} significant grease produces an “Ultra bright” end for ornamental applications

Soap (round wire only): Soap is employed as a stuff within the drawing method and isn't removed. It acts as a stuff throughout client half forming operation. 

A soap end is out there in tempered merchandise.

Plated: several plating choices are accessible.

plating requests.

FORMS

Continuous Coils

Cut to lengths

Precision cutting

HEAT TREATMENT

Alloy 718 will be hardened by:

Cold operating

Age Hardening

Cold operating followed by Age Hardening

Limitation of Liability and Disclaimer of Warranty: In no event can Ulbrich unstained Steels and Special Metals, Inc., be to blame for any damages arising from the employment of the knowledge enclosed during this document or that it's appropriate for the ‘applications’ noted. we tend to believe data|the information} and data provided to be correct to the most effective of our knowledge however, all information is taken into account typical values solely. it's supposed for reference and general data and not counseled for specification, style or engineering functions. Mr Jiang assumes no understood or categorical pledge in relation to the creation or accuracy of the information provided during this document.


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