Steel grades consist of numbers, letters and digits.
The letter symbols for non-oriented and oriented Silicon-steels are “W” and “Q” respectively.
The thickness is placed in the front, the letter symbol in the middle, and the iron loss value at the end, e.g. 30Q113. In oriented Silicon-steel, the letter symbol “G” and “Q” are placed together for high magnetic susceptibility, e.g. 30QG113.
The number after the letter indicates 100 times the value of iron loss (W/kg).