Cobalt Steels


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Cobalt Steels employ 12 to 50% of Cobalt to increase the saturation flux density (by ~ 13%) to about 2.4 Tesla.   Vanadium is added to increase ductility. They are sold under a variety of trade names such as Hiperco, Vacodur.  Some are optimized to deliver superior magnetic properties (and inferior mechanical properties) and vice versa.  Specific annealing procedures, recommended by a manufacturer, should be used to attain their high flux density capability. Those with higher cobalt are rather expensive; they are used in the aerospace industry where small size and lightweight are more important than cost. Those with lower cobalt are less expensive, but their magnetic properties are less attractive.  For a full list of all grades, click the searchable ‘Steels List’ button on the home page.

Version 6 stores both B(H) and Core Loss properties of each grade in a single excel file.  MagWeb’s Cobalt Steel Folder has 243 excel files listing the magnetic properties of these materials, produced by 4 manufacturers.  They contain 51 data sets of B(H) magnetization curves 192 data sets of core loss curves.  For a full list of names of all these grades, please click ‘Steels List’.

Version 6 also added a data smoother. It is not unusual for measured data to be rough. Rough data can slow solution convergence.  To prevent such slowdown, MagWeb locates all rough spots in all raw data and spot-cleans them.  Version 6 also extrapolated all smoothed data to saturation. You can download Saturation Flux Density Js of thousands of Grades from SMAG – Materials link.

By downloading this Folder, you will have 243 files on the magnetic properties of all Cobalt Steels manufactured worldwide at your fingertips!

Please review the ‘Steels Handbook’ from the Home Page for more technical information on these Cobalt Steel materials.

This website is designed for the automated download of Folders (containing the magnetic property files) via credit card. If you wish to purchase via quote/purchase order, please email


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