| 摘要 |
PURPOSE:To accelerate the reduction of a steel strip and to remove the fine oxidized films on the surfaces of the strip efficiently by generating corona discharge between discharge electrodes and the strip in a reducing furnace of a continuous plating line. CONSTITUTION:A steel strip A is heated to a required temp. in a heating zone H of a heating furnace 1 of vertical type. After the strip is subjected to a reduction treatment in a reducing zone R of a reducing furnace 2 of vertical type, the strip travels through a snout 3 continuous to the end part of the furnace 2 and is conducted into a plating cell 4 where the strip receives plating. Corona discharge is generated between discharge electrodes 10 provided in said furnace 2 and the strip A in contact with rolls 12 for grounding to induce ion impact, electron impact, etc. and to cause ion dissociation of gaseous hydrogen of the atmosphere in the furnace, thereby accelerating reduction reaction. Said electrodes 10 consist of heat resistant metallic rolls 101 coated with heat resistant electric insulators 11 of ceramics or the like and are constructed rotatable so as to prevent local consumption. |
