Nickel Iron Alloy 4750 / High Perm 49®


Technical Data Sheet

 

Chemical Composition Limits
Weight% C Mn Si P S Ni Fe
Nickel Iron 4750 0.035 max 0.8 max 0.5 max 0.02 max 0.008 max 47.0-50.0 Bal
As per MIL-N-14411 Comp 3 and 4

Alloy 4750/ High Perm 49® is a 48% nickel-iron alloy which combines a high saturation flux density (approx. 16000 gauss / 1.6 tesla) with high magnetic permeability and low core loss. This alloy has the high saturation flux density of any of the nickel-iron alloys, making it a versatile alloy. Typical applications include laminated cores for instrument transformers, magnetic shields, and cores for certain electronic and communications devices where its high permeability at low magnetizing forces can greatly increase the device's efficiency.

In order to achieve the maximum softness and optimum magnetic and electrical properties, Alloy 4750 should be annealed in a dry hydrogen atmosphere at 2150°F for 2-4 hours, followed by a furnace cool at 100-200°F per hour down to 800°F and at any rate thereafter.

Typical Mechanical Properties

 

Material Condition Tensile Strength Modus of Elasticity (in tension) Elongation (%) Hardness Rb
ksi Mpa psi x10 (4) Mpa x 10 (3)
Alloy 4750 Sheet As cold drawn 130 896 24 166 5 100
Alloy 4750 Sheet Forming/Deep Drwg 80 552 24 166 32 68

 

Material Condition Tensile Strength Yield Strength Elongation (%) Reduction of area (%) Hardness Rb
ksi Mpa ksi Mpa
Alloy 4750 Bar As cold drawn 95 655 80 552 25 62 98
Alloy 4750 Bar Hydrogen (2150°F) 70 483 22 152 45 68 62
Alloy 4750 Bar Hydrogen (1600°F) 75 517 23 154 43 65 75


Technical Data

Physical Properties
Specific Gravity - 8.18
Density - 0.2950 lb/in ³
Mean Specific Heat - 0.1200 Btu/lb/°F
Thermal Conductivity - 90.20 BTU-in/hr/ft ²/°F

Modulus of Elasticity
After Process Anneal at 871°C, in tension, Bar - 22.0 x 10³ ksi
After Process Anneal at 871 °C, in torsion, Bar - 7.60 x 10³ ksi
Cold drawn, in torsion, Bar - 7.80 x 10³ ksi
Cold drawn, in tension, Bar - 24.0 x 10³ ksi
Cold rolled, in tension, Strip - 24.0 x 10³ ksi
Forming and Deep Draw Qlty, in tension, Strip - 24.0 x 10³ ksi
Hydrongen Annealed @ 1177°C, in tension, Bar - 22.5 x 10³ ksi
Hydrongen Annealed @ 1177°C, in torsion, Bar - 7.50 x 10³ ksi
Electrical Resistivity - 290.0 ohm-cir-mil/ft
Temp Coefficient of Electrical Resistance - 20.0 x 10(-4) Ohm/Ohm/ °F
Curie Temperature - 840 to 930°F
Melting Range - 2600°F

Magnetic Properties
DC Magnetic Properties (according to ASTM A-596)

Properties Bar Strip
0.014" 0.025-0.125"
Initial Permeability (B100) 6500 12000 8000
Max. Permeability 75000 150000 90000
Residual Magnetism (Gausses 9000 9000 9000
Coercive Force, Oersteds from 10,000 Gausses 0.04/0.07 0.05-0.06 0.004-0.007
Saturation Induction from H-100 Oersteds, Gausses 15000 15000 15000

Remant Flux & Coercive Force
0.060" thick rings from a flux density of 13,000 gausses

Treatment Remnant Flux Gausse Coercive Force Oersteds
Typical Mill Process Anneal 6300 0.85
1450°F-2h-Dry H2 9900 0.48
1600°F-2h-Dry H2 10200 0.32
17500°F-2h-Dry H2 10300 0.18
2050°F-2h-Dry H2 10900 0.05

Availability
Alloy 4750 is available in bar, wire, sheet and strip. For all stock availability contact Sales for further availability.

Specifications
UNS K94840
Carpenter High Perm 49®
AMS 7718
Mil-N-14411 Comp 3 - all products forms
Mil-N-14411 Comp 4 - strip (<0.020" thick)
ASTM A753 Alloy 2
IEC 404-8-6 (Alloy class E3)

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.