ArnokromeTM Magnetic Alloys

Ductile permanent magnet alloys with low coercivity

PTM's Arnokrome Magnet Alloys are designed to provide superior performance in applications that require low coercivity magnetic materials, including magnetic clutch/break, anti-theft tags, sensing, and guitar strings. Produced in strip or wire forms and available in different formulations of iron and other metal constituents, Arnokrome is mechanically tough, stable across a wide temperature range, and machinable. Arnold can customize the properties of Arnokrome, including magnetic orientation and coercivity, to satisfy a variety of mechanical, surface, magnetic, and other requirements.

Excellent substitute for Vicalloy and Cunife

Vicalloy and Cunife materials provide good shape-forming freedom; however, their relatively low performing magnetic properties and cost are a barrier for continued use of these older materials. By updating your design with an Arnokrome iron-chrome-cobalt alloy, you can achieve a higher magnetic performance at a more attractive price point.


Arnokrome composition


Material Composition (% weight)
Iron (Fe) Chromium (Cr) Manganese (Mn) Cobalt (Co)
Arnokrome 3
strip, rod & wire
60 - 67 26 - 30   7 - 10
Arnokrome 4 95 - 97 3 - 5    
Arnokrome 5 91.5 - 93   7 - 8.5  




Characteristics


  Coercivity range Hc oersted Remanence (KGauss) Rolled strip thickness
ARNOKROME 3
Bar, Rod, Wire
50 - 300 9 - 12 0.002" - 0.008" (0.05 - 0.20mm)
ARNOKROME 3 50 - 300 9 - 12 0.0008" - 0.006" (0.02 - 0.15mm)
ARNOKROME 4 20 - 55 9 - 14 0.050" - 0.0005" (1.27 - 0.13mm)
ARNOKROME 5 20 - 50 2 - 16 0.002" - 0.008" (0.05 - 0.20mm)

Choosing the right Arnokrome material for your application

These materials are suitable for a range of applications. Contact us to discuss your application requirements.
Product Description Applications
Arnokrome 3
rod & wire
Best for low coercivity applications.

Cold drawable to 0.010" (0.25mm) diameter and can be supplied in coils up to 0.250” (6.35mm) in diameter and in cut lengths of up to 4 feet (1219.20mm). 

Through heat treating, the magnetic properties can be tailored for your specific application.
Inductors
Arnokrome 3 Cold rollable to 0.0005" (0.13mm) thick foil, and can be supplied in widths from 0.062" (1.575mm) to 9" (228.6mm). Sensor
Arnokrome 4 Arnokrome 4 is isotropic and supplied in the heat treated form.

Lacks Cobalt, making it lower cost than Arnokrome 3. 

Cold rollable to 0.0008" (0.02mm) thick foil and can be supplied in widths from 0.040" (1.016mm) to 10" (254mm).
Sensor
Arnokrome 5 Arnokrome 5 is isotropic and supplied in the heat treated form. 

Cold rollable to 0.002" (0.051mm) thick foil, and can be supplied in widths from 0.040" (1.016mm) to 14" (355.6mm).

A much narrower range of magnetic characteristics compared to Arnokrome 3 but at a significantly reduced cost.
Sensor