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K94840 Iron-Nickel Soft Magnetic Alloy Highest SaturationFlux Density FeNi Alloy

Place of Origin China
Brand Name XUNSHI
Certification ISO9001:2015
Model Number UNS K94840
Minimum Order Quantity 150 kg
Price Negotiable
Packaging Details Plywood crate
Delivery Time 30 days
Payment Terms T/T
Supply Ability 10 ton per month

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Product Details
Equal Grade 1.3922, K94840 Trade Name HIGH PERMEABILITY 49, IMPHY® SUPRA 50, FeNi48
Spec ASTM A753, ASTM F30
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Product Description

K94840 is a 48% nickel-iron alloy that possesses the highest saturation flux density of any nickel-iron alloy. The saturation flux density of about 16000 gauss (1.6 Tesla) combined with high magnetic permeability and low core loss makes this a versatile alloy with many potential applications.

K94840 has been used in laminated cores for instrument transformers, magnetic shields and cores for certain electronic and communications devices in which extremely high permeability at low magnetizing forces greatly increases the efficiency and effectiveness of the equipment.

Because of its high permeability, it has also been used in solenoid cores and sensitive relays that must respond to low magnetizing forces


Chemical composition

Element C Mn Si P S Cr Ni Mo Co Cu Fe
Wt, % 0.05 0.80 0.50 0.03 0.01 0.30 47-49 0.30 0.50 0.30 rem


Key Properties:

  • High saturation flux density
  • High magnetic permeability
  • Low core loss



  • Actuators
  • Gas safety valves
  • Ground fault circuit breaker (relay parts)
  • High precision current transformer cores
  • Safety valves
  • Relays
  • Resolvers
  • Sensors
  • Shielding
  • Watches
  • Instrument transformers
  • Sensitive relay and solenoid components



  • 1.3922
  • 1.3926
  • K94800
  • K94840
  • DIN17405
  • ASTM F30
  • ASTM A730
  • IEC 404
  • JIS C2531
  • ASTM A753 Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490,
  • K94840, N14076, N14080)
  • MIL-N-14411B (MR) (Composition 3 and 4)



Heat treatment

Standard hydrogen anneal

For maximum softness and optimum magnetic and electrical properties, K94840 should be annealed in an oxygen-free, dry hydrogen atmosphere with a dew point below -40°F (-40°C) for 2 to 4 hours at 2150°F (1177°C), followed by a furnace cool at a rate of 100/200°F (55/110°C) per hour down to 800°F (427°C) and at any rate thereafter.

Oil, grease, lacquer, and any other contaminants must be removed before annealing. During hydrogen annealing, the individual parts should be separated by a surface insulation media or an inert insulating powder, such as magnesium or aluminum oxide.


K94840 Iron-Nickel Soft Magnetic Alloy Highest SaturationFlux Density FeNi Alloy 0


K94840 Iron-Nickel Soft Magnetic Alloy Highest SaturationFlux Density FeNi Alloy 1K94840 Iron-Nickel Soft Magnetic Alloy Highest SaturationFlux Density FeNi Alloy 2