| 摘要 |
PROBLEM TO BE SOLVED: To improve the heating capacity in a heating furnace without executing the remodeling of the volume in the furnace. SOLUTION: The heating is started at the setting temp. in the furnace higher than the soaking target temp. and also, the temp. in the furnace is measured with a thermometer 4 at each prescribed time and the temp. at the edge part surface having the quickest heat-up and the temp. at the core part in the center line having the slowest heat-up in the steel material 1 heated based on the measured temp., are calculated with a steel material temp. calculating unit 10. When the calculated temp. of the edge part surface having quickest heat-up in the steel material 1 reaches the constant temp. near the soaking target temp. of the steel material 1, the setting temp. in the furnace is changed to set to the soaking target temp., and when the calculated temp. of the core part of the center line having slowest heat-up in the steel material 1 reaches the soaking target temp., the heating is completed.
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