Patent ID: 7087869

Claim:
A transverse induction heating apparatus comprising: inductors including iron cores and coils wound around the iron cores, disposed between a rough rolling mill and a finish rolling mill of a steel hot-rolling line, opposite to each other on opposite sides of a material to be rolled and conveyed by a conveying roll, the material being heated by the inductors to which electric power is supplied from an AC power source, wherein, iron core widths of the inductors in a plate width direction of the material to be rolled are smaller than the plate width of the material to be rolled, the inductors are disposed on a plate width center line of the material to be rolled, and, when current penetration depth is δ(m), specific resistance of the material to be rolled is ρ(Ω-m), magnetic permeability of the material to be rolled is μ(H/m), frequency of the AC power source is f (Hz), and plate thickness of the material to be rolled is tw (m), δ = ρ μ · f · π ⁢ ⁢ and ⁢ ⁢ tw δ < 0.95 .