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1. 发明专利

JPS5569220A ANNEALING METHOD FOR HOLLOW METAL CYLINDER 失效
公开(公告)号：JPS5569220A
公开(公告)日：1980-05-24
申请号：JP14257878
申请日：1978-11-17
申请人： KOBE STEEL LTD
发明人： TAKAOKA NOBUO , HAYASHI TERUHIRO , AZUMI MAKOTO
IPC分类号： C22F1/00 , C21D9/08 , C22F1/18
摘要： PURPOSE:To prevent the annealing deformation of cylinder, by providing hollow cylindrical body made of zirconium (alloy) for nuclear reactor in casing sticking closely and carrying out annealing under a specific condition introducing pressurized gas in the cylinder. CONSTITUTION:The blind plate 4a, 4b are inserted into both tip end part of openings of the hollow cylinder 1 and the above body is closely furnished in the casing 3 composed of the upper and lower cover 6a, 6b and left and right blocking plate 7a, 7b. The above casing is put in the heating furnace kept at 400-800 deg.C and annealing treatment is carried out sending pressurized inactive gas at P kg/cm , shown in the formula I, from the gas duct 9. But, K is a constant determined by the sectional shape of the cylinder having thickness; t mm, outer circumference length; L mm, pressure resisting force at annealing temperature; thetay kg/mm and in case of n-gon, K is shown by the formula II and then, in case of round shape or oval, the value of K is 314. By the above method, forming or welding strain of the cylinder is removed and processing for reforming transformation after annealing is unnecessary.

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