30QH120 Grain-Oriented Electrical Steel — 0.30 mm, 1.20 W/kg
30QH120: what it is and where it belongs
30QH120 matches the classic GB 30Q120 designation that has been in Chinese distribution transformer production for decades. At 1.20 W/kg it is the familiar, cheapest route to a serviceable core, and is positioned in our catalogue as backfill and stock rather than a lead product.
Typical applications
General distribution transformers
Export units with modest efficiency requirements
Cost-priority projects
Stock and replacement cores
Selection and processing notes
Efficiency regulation is narrowing the envelope for 0.30 mm conventional material: quote it only when the threshold allows.
Always offer a 0.27 mm alternative in the same quotation — the customer can then choose on unit cost, not on habit.
Supply form and documentation
Supplied as master coil 900–1250 mm wide (508 mm ID, 2–5 t per coil), slit strip from approximately 100 mm at ±0.5 mm width tolerance, or cut-to-length sheets to your lamination size. Standard insulation coating is C5, with C6 heat-resistant and chrome-free options. Every shipment carries an MTC to EN 10204 3.1 stating grade, heat number, measured core loss and flux density, plus packing list and — for export — certificate of origin and a standard cross-reference sheet against IEC 60404-8-7, ASTM A876, EN 10107 and JIS C 2553.
Equivalent designations
Nearest mill equivalent: GB 30Q120. Buyers specifying to IEC or ASTM may treat this grade as the 0.30 mm, 1.20 W/kg tier; the equivalence sheet is supplied with the quotation so the substitution can be written into the purchase order without ambiguity.
