What is the Relative Permeability of Silicon Steel - 3%, 3.5%, 4%

http://www.bing.com/search?q=relative+permeability+of+silicon+steel+&src=IE-SearchBox&Form=IE8SRC

It is 3.4%

Silicon Steels have a wide range of permeabilities depending on how hard they are driven (also known as amplitude permeability), how they are annealed, grain orientation, and as you surmised, their silicon content.

BOZORTH has probably the best book on the subject "Ferromagnetism", otherwise the guys at Magnetic Metals in Anaheim, or Carpenter Steel should be able to help you.

Most standard 3.4% CRGO (Cold Rolled, Grain Oriented) will peak in their pemeability around the 8-12 Kgauss range (10-15,000 perm). Low excite inductance <100gauss can be anywhere from a few thousand to the more typical 6-8,000 perm range.

Beyond that, the only ways to increase perm on silicon steels is to either add dopants like Nickel or change the processing from sheet steels to nanocrystallines.

Thanks

You are a gem

It helped a lot

Ami