| 摘要 |
PURPOSE:To cool a steel tube quickly and uniformly without causing change of shape due to cooling in cooling a high temperature steel tube by water cooling forcibly from inside and outside of the steel tube while rotating the tube in a cooling tank. CONSTITUTION:A high temperature steel tube 14 is thrown down into a cooling tank from a throwing skid and placed on rotating rollers 12 provided at plural places in longitudinal direction and adjusted to roll load of >=100kg and <=1,000 kg. The steel tube is rotated at >=10 per minute and continued for >=0.7Xt second corresponding to the maximum thickness of the steel tube. At the same time, cooling water is spouted from agitating headers 5 and a nozzle for cooling inside of the tube, and the steel tube 14 is cooled forcibly from inside and outside. Deterioration of out of roundness of the tube 14 and bending of the end part due to cooling do not occur and the tube is cooled uniformly and quickly. After cooling, the tube is taken out from the cooling tank 2 by a chain lifter 6. |
