... : EI-28, EI-30, EI-35, EI-41, EI-41-2H, EI-48, EI-48-2H, EI-54,bEI-57, EI-57-2H / 4H, EI-60, EI-66, EI-66-4H, EI-76 ... .2, EI ... , such as Chinese steel4) Applicable to all kinds of iron cores for power transformers, rectifiers, electrical welders, etc