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.
|Color deviations are possible, but they have no influence on the properties||Phosphate on glas film:
|Coated sides||both sides|
|Coating thickness||2 µm - 5 µm|
|SURFACE INSULATION RESISTANCE|
|at room temperatureaccording to IEC 60404-11||> 10 Ω cm2|
|Under inert gas according to IEC 60404-12||840 °C / 2 h|
|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|
|w.r.t. transformer oil||very good|