| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat treatment method of a complex roll for rolling with which in the heating to austenizing temperature at the quenching time, the heat-rising of an inner layer is restricted to the minimum at the heating of an outer layer, and the brittleness of the inner layer and the coarsening of crystal grain are prevented and also, only the outer layer can be austenized in a short time and the carbide in the outer layer is sufficiently made to solid-solution in the matrix and thus, the excellent characteristic of a high speed steel can be obtained. SOLUTION: In the heat treatment method of the complex roll for rolling, the heating to austenizing temperature when the quenching is applied to the complex roll for rolling, is performed as the followings, that is; a first process for heating the complex roll for rolling in a first heating furnace at 10-30°C/Hr temperature-rising speed from the room temperature to 600-700°C, after heat-insulating the portion held into a second heating furnace in the inner layer and both end surface parts in the outer layer in the complex roll for rolling; and a second process for heating the outer layer at 300-600°C/Hr temperature-rising speed from 600-700°C to 1050-1150°C, after transporting the complex roll for rolling into the second heating furnace are contained. COPYRIGHT: (C)2007,JPO&INPIT
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