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Insulation basis

Grain oriented electrical steel strip is supplied with a thin in- organic coating on the glass film layer formed during annealing. A film thickness of 2 to 5 µm provides good electrical resistance and a high stacking factor.

The coating, which is annealing resistant up to 840 °C, enables wound cores and sheet blanks to be stress relief annealed. The coating is chemically resistant to liquids to which it is typi-cally exposed during the production process and has no effect on the various types of transformer oils.

We offer two types of insulation coatings: the chromium-contain-ing coating and the chromium-free coating. Both coatings are similar from a technological point of view.

COLORATION
Color deviations are possible, but they have no influence on the properties Phosphate on glas film:
gray
COATING
Coated sides both sides
Coating thickness 2 µm - 5 µm
SURFACE INSULATION RESISTANCE
at room temperatureaccording to IEC 60404-11 > 10 Ω cm2
ANNEALING RESISTANCE
Under inert gas according to IEC 60404-12 840 °C / 2 h
DESIGNATION
Comparison with the designations IEC 60404-1-1 EC-5-G on EC-2
Comparison with the designations ASTM A976 C-5 over C-2
CHEMICAL RESISTANCE
w.r.t. transformer oil very good

General inquiry

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Contact

thyssenkrupp Steel Europe AG

Kaiser-Wilhelm-Strasse 100

47166 Duisburg, Germany

+49 (0)203 52-0

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