... -4H.2. Performance: conforms to International standards3. Raw Materials (cold rolled grain non oriented silicon steel coils): a) Bao steel: B50A1000, B50A800, B50A600, B50A470 ... , 50AW1000, 50AW800, 50AW600, 50AW470 e) Imported silicon steel coils, such as Chinese steel.4. Applicable to all kinds of iron cores for power transformers ...