B50A310 is up to 0.8% -4.8% silicon electrical steel, after hot and cold rolled steel. Usually the thickness of 1mm or less.

B50A350 is up to 0.8% -4.8% silicon electrical steel, after hot and cold rolled steel. Usually the thickness of 1mm or less.

B50A400 is up to 0.8% -4.8% silicon electrical steel, after hot and cold rolled steel. Usually the thickness of 1mm or less.