| 摘要 |
The objective is to provide a thick steel plate manufacturing method with which a high-quality thick steel plate with minimal variation in material quality can be obtained. This thick steel plate manufacturing method, which manufactures a thick steel plate by means of a hot-rolling process, a heated correction process, and an accelerated cooling process, in this order, is characterized by having between the heated correction process and the accelerated cooling process a descaling process in which descaling water is sprayed twice, with the total energy density of the descaling water sprayed on the surface of the thick steel plate in the two sprayings in the descaling process being 0.07 J/mm2 or greater, the second spraying of descaling water occurring no less than 0.5s after the first spraying of descaling water, and the surface temperature of the steel plate immediately before the second spraying of descaling water being no greater than the Ar3 transformation point. |
