Rolling and pickling process of wide zirconium plate

Abstract

The invention discloses a rolling and pickling process of a wide zirconium plate. The rolling and pickling process comprises the steps of plate blank heating, rough rolling, hot coil box machining, finish rolling, coiling, welding, pickling annealing, pickling and coiling. According to the process, the temperatures of the first heating section, the second heating section and the soaking section are controlled in a heating furnace, so that a zirconium plate blank is heated more sufficiently, various properties of the plate blank are more stable in the subsequent rolling process, and meanwhile, the heating time in the furnace is shortened; mandrel-free coiling is conducted on a rough-rolled intermediate blank, then uncoiling is conducted to convert the intermediate blank into an upper surface and a lower surface so as to eliminate a head-tail temperature difference, enable the temperature of the plant blank to be more balanced and improve the thin specification and deformation resistance of a zirconium plate, two-stage pickling is adopted in a pickling process, aurous is added into nitric acid and hydrofluoric acid, the temperature change amplitude is reduced, spray-type pickling is changed, and therefore, the pickling process is more sufficient, oxide skin treatment is more thorough, small pits can be prevented from appearing on the surface of the zirconium plate, and the surface quality of the zirconium plate is improved.

Description

technical field [0001] The invention belongs to the technical field of zirconium plate rolling, in particular to a rolling and pickling process of a wide zirconium plate. Background technique [0002] In recent years, with the gradual expansion of ecological and environmental protection tasks and the expansion of the demand for high-end materials for high-end equipment in the chemical industry in my country, the requirements for zirconium alloy materials tend to be high-end, localized, independent and specialized. It exhibits excellent corrosion resistance, and its corrosion resistance is better than that of titanium; its expansion coefficient is low, only 2 / 3 of that of titanium, and it is an excellent structural material for chemical corrosion-resistant pressure vessels; [0003] The following problems exist in the processing process of the existing pure zirconium wide sheet: 1) the hot rolling temperature range is narrow, the metal temperature drop is fast, the deformation...

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Problems solved by technology

[0003] The following problems exist in the processing process of the existing pure zirconium wide sheet: 1) the hot rolling temperature range is narrow, the metal temperature drop is fast, the deformation resistance during rolling is large, and the work hardening is remarkable. The rolling rate is too large or the rolling speed is too high, and rolling cracking is prone to occur, and the product surface quality is poor; 2) During the process of rolling and conveying, the slab will have a certain amount of heat loss, and the heat loss of the head and tail of the slab is relatively large. Fast, making the temperature of the whole slab unbalanced, making the slab edge cracks prone to occur during the rolling process, and the product quality is not stable enough

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