CRNGO Steel
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Every type of steel has "grains" which consist of "domains". These "domains" are nothing but electrical charges oriented in any random direction. Therefore if a transformer were to be made of Mild Steel used as core material, the core loss would be approx. 16 to 17 wkg at 1.5T50Hz and the size of the transformer would be approx. 18 to 20 times the size of a transformer manufactured with GO steels.