| 摘要 |
PROBLEM TO BE SOLVED: To provide a descaling method by which both ordinary oxidized scale which is generated when heating the steel material containing Si, Cr or Ni up to the hot-rolling temperature range and composed of three layers and a sub-scale which is generated on the interface of the oxidized scale and a base steel and difficult to be peeled can be efficiently removed in both aspects of equipment and energy consumption. SOLUTION: In this descaling of the steel material for hot rolling containing at least one kind of Si, Cr and Ni of≥0.1%, mechanical descaling is performed at the surface temperature of≥900°C after heating the steel material at the atmospheric temperature of≥1,200°C in a heating furnace. Under such mechanical descaling conditions, the porosity of the sub-scale is increased, the sub-scale is made into more porous structure or the rate of decrease of the hardness of the scale is increased. Then, the sub-scale is easily destroyed and peeled with a brush roll. COPYRIGHT: (C)2007,JPO&INPIT
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