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In order to plan effective energy saving measures for continuous heating furnaces, it is necessary to investigate the actual conditions in the equipments and furnace operations which have an effect on the unit fuel consumption. Therefore, from the heat balance equation of a heating furnace, 'heat transmission efficiency in a furnace' and 'heat loss' were considered to be characteristics of the unit fuel consumption. These values were calculated from the actual measurements in the main heating furnaces, and energy saving countermeasures and the expected effects were clarified by the comparison of these results. Among various countermeasures the increase in efficiencies of recuperators is especially effective and the improvements of recuperators were proposed individually and systematically. These countermeasures have been carried out in the various heating furnaces and contributed to drastic reduction in the fuel consumption. (Wassmann)