Smiths Local Branch Finder

You are here: → HomeMaterialsNickel AlloysRadiometal 4550

Radiometal 4550 Nickel AlloyRadiometal 4550

45% Nickel-Iron Alloy

Radiometal 4550 has a nominal 45% nickel content and combines excellent permeability with high saturation flux density.

The alloy is used to great advantage in sensitive relays which need to respond to very weak currents. It is also widely employed in transformers, chokes and special motors where the properties of silicon-iron do not provide the required magnetic performance. Material is supplied in the hot rolled condition. It should be noted that optimum magnetic properties in components are only achieved after heat treatment at 1,180°C in dry hydrogen – our laboratory can provide full details of the process.

The density of this nickel-iron alloy is 8,250 kg/m3.

Forming & Machining:

Nickel-iron alloys are austenitic in structure and are therefore readily formable by bending, stretching and deep drawing.

Machining is not difficult but it must be recognised that this type of material work hardens readily and care needs to be taken over the choice of tool geometry and material feeds, speeds and cutting fluids. We are able to provide recommendations.

Download Radiometal 4550 Nickel Alloy Datasheet

Typical Applications:

  • Toroidal cores and laminations
  • Telecommunications transformers
  • High performance motors
  • Protection relays
  • Servo valves and actuators
  • Gas valves
  • Missile systems
  • Watch movements

We offer Radiometal 4550 nickel alloy in black, peeled or precision ground hot rolled bar.


With power saws across the Group including a fully automated magazine feed CNC rod blanking line, we can cut your material to your size requirements.

Pick a Product

To find out more about Smiths Metal Centres own range of nickel alloys, click on one of our products on the side menu of this web page.

Have a question or need a detailed quote?

Our staff are ready to take your call. For all supply and technical enquiries call us today
on 0845 527 3331 or click here to contact us.