... international standards 3) Materials (cold rolled grain non silicon steel sheet:1) Specifications: EI-28, EI-30, EI ... to international standards3) Materials (cold rolled grain non oriented silicon steel coils):a) Baosteel: B50A1000, B50A800, B50A600, B50A470, ... silicon steel coils, such as Chinese steel4) Applicable to all kinds of iron cores for power transformers, rectifiers, electrical welders ...