| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat-treatment method for metal band with which the heat-treatment for metal band, such as a steel band can continuously and stably be performed with a continuous heat-treatment line having a horizontal-type heating furnace. SOLUTION: When the round-speed of a hearth roll 13 set in the inner part of the heating furnace 12 is made to be V<SB>HR</SB>, the passing-through speed of the steel band 11 in the furnace is made to be V<SB>ST</SB>, the round speed of the inlet side bridle roll 14 set at the inlet side of the heating furnace 12 is made to be V<SB>IN</SB>and the round speed of the outlet side bridle roll 15 set at the outlet side of the heating furnace 12 is made to be V<SB>OUT</SB>; the hearth roll 13 is rounded at the round speed, so that a speed difference ratio L defined with L=(V<SB>HR</SB>-V<SB>ST</SB>)/V<SB>ST</SB>to an extending ratioγof the steel band in the furnace shown withγ=(V<SB>OUT</SB>-V<SB>IN</SB>)/V<SB>IN</SB>, becomes L≥γ, and also, the tension of the steel band 11 at the inlet side of the heating furnace is measured by an inlet side tension-meter 16 set between the heating furnace 12 and the inlet side bridle roll 14 and the round speed of the outlet side bridle roll 15 is adjusted based on the difference between the tension measured value in the inlet side tension-meter 16 and the inlet side tension target value. COPYRIGHT: (C)2011,JPO&INPIT
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