B35G155 steel silicon content is about 3% to 5%, and other major iron silicon alloy.

B30G140 steel properties : Low iron loss, magnetic flux density under a strong magnetic field (magnetic induction) high, smooth surface, uniform thickness and smooth, punching resistance

B30G130 steel properties : Low iron loss, magnetic flux density under a strong magnetic field (magnetic induction) high, smooth surface, uniform thickness and smooth, punching resistance