| 摘要 |
PROBLEM TO BE SOLVED: To provide a preventing method of the camber of a U-shape sheet pile by which a special inverting device and restraining device are not required in the case the U-shape sheet pile is rolled in the inverted U-shape position. SOLUTION: This method has a stage where a long size U-shape sheet pile 1 is formed by hot finish rolling in the inverted U-shape position, a stage where the inside of the web part 2 of the long size sheet pile 1 is cooled as it is in the inverted U-shape position and a stage where the long size U-shape sheet pile 1 is divided into a prescribed length after or during cooling the inside of the web part 2 of the long size U-shape sheet pile 1. The cooling range is a range the length of which is≥25% of the length of a U-shape sheet pile 1 after dividing and which includes the neighborhood of the middle of the U-shape sheet pile 1 after dividing. Further, weak cooling is performed to the inside of the web part 2 at the temperature drop of <80°C and the cooling rate of≤5°C/s. Cooling water is sprayed from spray nozzles 8 toward the inside of the web part 2. The ranges where the cooling water jetted from a plurality of sprays is collided are away from each other. COPYRIGHT: (C)2007,JPO&INPIT |
