| 摘要 |
PURPOSE:To improve the quality of a steel sheet while saving a cost for installation, by directly supplying an electric current to a steel sheet passing through an annealing furnace to heat the steel sheet to a high temperature using the steel sheet itself as a heater. CONSTITUTION:A steel strip sheet 3 is uncoiled from a feed reel 1 and carried to a recoiling reel 2. A couple of electrode rolls 5 are arranged at start and final points which define a predetermined length of the steel sheet 3. The defined part of the steel sheet 3 is looped with electrically insulated guide rolls 6, and received in an annealing furnace 7. The annealing furnace is provided at its inlet and outlet sides with attachments to electrically insulate a part of the steel sheet 3 running outside the furnace. Two of thus constructed heating means are connected together. The upstream side is used as a heating zone 7a, while the downstream side is used as a soaking zone 7b. The steel sheet 3 is carried through these zones continuously. A direct or alternating electric current is supplied to each zone from individual power sources 4a, 4b, to heat the steel sheet to a high temperature with use of the steel sheet itself as a heater. |
