30QH105 Grain-Oriented Electrical Steel — 0.30 mm, 1.05 W/kg
30QH105: what it is and where it belongs
30QH105 is the better of the two 0.30 mm grades: 1.05 W/kg with 1.88 T flux density. It exists for plants whose slitting and stacking lines handle 0.30 mm far better than thin gauge, but who still need to clear a Grade 2-class loss target in dry-type or larger distribution units.
Typical applications
Dry-type transformers
Larger distribution units
OEM equipment
Plants with tooling optimised for 0.30 mm
Selection and processing notes
The practical choice when a line cannot run 0.23 mm reliably — better a stable 0.30 mm build than a failing thin-gauge trial.
Confirm the loss margin: 0.27 mm 27GK090 gives roughly 0.15 W/kg more headroom at similar processing difficulty.
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: B30P105 equivalent. Buyers specifying to IEC or ASTM may treat this grade as the 0.30 mm, 1.05 W/kg tier; the equivalence sheet is supplied with the quotation so the substitution can be written into the purchase order without ambiguity.
