| 摘要 |
PURPOSE:To obtain a steel plate having high quality, uniform mechanical property and excellent shape by forcedly cooling the steel plate after hot-rolling, adjusting the steel plate after completing the rolling to the specific surface roughness Ra and precisely and uniformly cooling the hot rolled steel plate. CONSTITUTION:The steel plate after hot-rolling is forcedly cooled under controlling water quantity density and cooling time. Then, the surface roughness Ra of steel plate after completing the rolling, is adjusted to 8-15mum. The above adjustment for the surface roughness is rolled by using the roll having suitable roughness and can be executed by transferring the roughness to the surface of steel plate. In this way, the prescribed cooling velocity and cooling stopping temp. are executed under high accuracy in the forced cooling to obtain the accurately and uniformly cooling condition for the steel plate.
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