Carbon Steels


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Carbon Steels are those with relatively more carbon than electrical steels. They are grouped into low carbon steels (usually 0.05% to 0.3% C) and industrial steels (with more than 0.3%C).  This folder also contains magnetic properties of both mild steels and industrial steels.  It includes a variety of  10xx series of mild steels, 4340, HSLA, tool steels, etc in cold/hot rolled, annealed/ un-annealed conditions. It also lists six grades of pure iron (ie. carbon removed as much as possible, so has higher permeability and does not suffer from aging). 

These steels are very lossy above ~ 5 Hz. So they are used mostly in applications that carry large flux at low flux densities and frequencies. These include rotors, pole pieces, solenoids, actuators, lifting magnets, etc.   They are more ductile and machinable than electrical steel. Because of their higher carbon content, they are prone to aging.  Their magnetic properties can vary with manufacturer, heat, form, and annealing. They are available as sheets, rods, tubes, etc in fully annealed or hardened conditions.

Version 6 stores both B(H) and Core Loss properties of each grade in a single excel file.   MagWeb’s Carbon Steel Folder has 143 grades of carbon steel.  They contain 140 B(H) magnetization data sets and 3 core loss data sets.  For names of all these grades, please click on ‘Steels List’ on the home page.  

Data in Version 6 also exploited a novel 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 ‘Steels List’.

By downloading this folder you will have 143 files on magnetic properties of low carbon steels produced worldwide at your fingertips!

Please review the Steels Handbook for more technical information on these materials. Version 6 contains several less-known facts on the magnetic properties of these steels; they will help you to better utilize these materials for the magnetic purposes. 

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


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