EFI Alloy 79 Properties

effi alloy 79 mechanical physical properties specifications chemistryEd Fagan Inc. recognizes that proper material selection is very important for the long term success of engineering applications.  With this in mind, the properties of EFI Alloy 79 are provided below to assist in your evaluation.  Within these tables you will find the typical physical, mechanical and chemistry data along with specifications pertaining to this alloy.


EFI Alloy 79 is a soft magnetic alloy consisting of 80% nickel, 5% molybdenum and balance iron.  The alloy is beneficial for conditions where extremely high initial and maximum permeability is needed with minimum hysteresis.

For an EFI Alloy 79 data sheet, or any other Soft Magnetics Alloys data sheets, please go to our Alloys and Metals Literature Library section.

Please contact the Ed Fagan Inc. sales team at 800-348-6268 with any questions you may have about the properties of this alloy.  We are experts in the metals and alloys we supply and are here to assist you.

EFI Alloy 79 Typical DC Magnetic Properties
Saturation Induction - Gausses8,700
Maximum Permeability230,000
Coercive Force - Oersteds0.015
Coercive Force - A/m1.19
EFI Alloy 79 Typical AC Magnetic Properties
Core Loss W/lb @ 400Hz & 20k GN/A
B-40 Permeability @ 60Hz45,000
N/A = not a typical application value
EFI Alloy 79 Physical Properties 
Densitylb/cu in0.316
Specific Gravity8.74
Curie Temp°F860
Melting Point°F2650
Electrical ResistivityMicrohms-cm59
ohm-cir mil/ft394
Thermal ConductivityW/cm °C0.35
BTU-in/sq. ft-hr-240
Specific HeatCal/gm °C--
BTU/lbm- °F--
Thermal Expansionppm / °F (75°F to 842°F)7.5
ppm / °C (25°C to 450°C)13.6
EFI Alloy 79 Mechanical Properties 
Tensile Strengthksi98
Yield Strengthksi38
Elongation% in 2 in.40
Typical Hardness Ann.Rockwell HRB85
Modules of ElasticityMpsi31.4
EFI Alloy 79 Chemistry 
Carbon, max0.05
Manganese, max0.80
Silicon, max0.50
Phosphorus, max0.02
Sulfur, max0.01
Chromium, max0.30
Cobalt, max0.50
Copper, max0.30
Iron is the balance by difference. Quantitative analysis of this element is not required.
Source: ASTM A753 Type 4, Chemical Requirements
EFI Alloy 79 Specifications  
ASTM A753 Type 4MIL N-14411CUNS N14080

For additional information on specifications of the materials distributed by Ed Fagan Inc., please visit the websites of the international standards organizations that develops and publishes technical standards, ASTM International and ASM International.

Ed Fagan Inc. is the leading global supplier of high-quality special purpose metals and alloys for the aerospace, communications, defense, electronics, energy, medical, research and other high-technology industries.