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Magnetic properties of electrical steel and austenitic steel

Austenitic grades

Types and grades of stainless steel are distinguished by their crystalline structure: Ferritic and martensitic rolled steel have magnetic characteristics. Non-magnetic grades include austenitic chromium-nickel and chromium-manganese-nickel rolled steel. Austenitic grades account for more than 70% of rolled steel. They contain up to 0.15% carbon, at least 16% chromium and a sufficient proportion of nickel and/or manganese to maintain the austenitic structure from cryogenic temperature to melting point. The classic composition (containing 18% Cr and 10%, Ni) is known as 18/10 and is widely used in cutlery production. 18/10 and 18/8, the "Super Austenitic" stainless steel grades - AL-6XN and 254SMO - are very resistant to pitting and crevice corrosion due to the high proportion of molybdenum (>6%) with a mixture of nitrogen, while the high percentage of nickel increases resistance to stress corrosion cracking.

Alloy Permeability μ [Gn/m]

Relative permeability μ/μ0

Magnetic field
Permalloy 1,0x10-2 70 000 0.002 Tesla
Electrical steel 5,0x10-3 4000 0.002 Tesla
Ferrite (Ni-Zn) 2.0x10-5 -8.0x10-4 16-640
Ferrite (Mni-Zn) >8,0x10-4 640 (or more) 0.002 Tesla
Nickel 1,25x10-4 100 - 600 0.002 Tesla

Furnizor

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