Production method of zirconium and zirconium alloy strip coil

Abstract

The invention provides a production method of a zirconium and zirconium alloy strip coil. The production method comprises the steps that a zirconium or zirconium alloy strip blank is heated in a heating furnace before production and is rolled on a steekle mill or a tandem rolling unit to the thickness that the blank can be transferred to a cold mill to be rolled, and the blank is directly coiled; surface treatment is carried out on a hot-rolling zirconium coil obtained through rolling on a continuous annealing-shot blasting-acid pickling production line, and a zirconium strip obtained after surface treatment is a smooth and clean zirconium strip which is in the metal natural color and free of oxide skin or harmful air suction layers; then a cold mill unit is adopted for carrying out cold rolling on the zirconium strip to obtain a thin strip, and cold rolling is carried out after annealing is carried out in an on-line annealing or vacuum annealing manner in the process of cold rolling; and finally various finished zirconium or zirconium alloy thin strip products of target thickness are obtained in a rolled manner. According to the production method, the cost is low, the product quality is good, and the rate of the finished products is improved by more than 15%; the requirements of nuclear power, chemical engineering and other aspects for thin zirconium materials and zirconium strips for thin-wall zirconium pipe welding can be completely met; and energy saving and consumption reduction are achieved, and high practical value is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a production method of zirconium and zirconium alloy coils. Background technique [0002] At present, the production of zirconium and zirconium alloy coils adopts the production method of splicing strips at home and abroad, that is, the zirconium slab is first rolled into a thickness of 1.0-2.0mm, a length of 1000-4000mm, and a width of 400-1000mm by hot rolling and cold rolling. Then cut the above zirconium plate into slabs, use the method of argon arc welding to tailor weld along the length direction to form a long strip with the required width of the finished product and roll it up to form a coil, and then roll it to a certain thickness through a strip rolling mill or thinner strip, the disadvantages of this method are as follows: First, the strip has multiple welds throughout the length, and the structure and properties of the welds are very different from the ...

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Problems solved by technology

[0002] At present, the production of zirconium and zirconium alloy coils adopts the production method of splicing strips at home and abroad, that is, the zirconium slab is first rolled into a thickness of 1.0-2.0mm, a length of 1000-4000mm, and a width of 400-1000mm by hot rolling and cold rolling. Then cut the above zirconium plate into slabs, use the method of argon arc welding to tailor weld along the length direction to form a long strip with the required width of the finished product and roll it up to form a coil, and then roll it to a certain thickness through a strip rolling mill or thinner strip, the disadvantages of this method are as follows: First, the strip has multiple welds throughout the length, and the structure and properties of the welds are very different from the original matrix. It is easy to break during use; the second is that due to the thickness deviation of the zirconium strips used for tailor welding, the strip shape after rolling is not good, the rolling speed is low, the rolling tonnage fluctuates greatly, and the roll shape is difficult to control by manual adjustment. , rolling is extremely difficult, and it is easy to cause strip pulling and broken strips; third, the yield of tailor-welded strip production is very low, and the production efficiency is extremely low, especially not suitable for zirconium foil rolling

There are also people who use the method of producing titanium strips or other metal strips to produce zirconium strips, but they have not been successful. The main reason is that the method of producing titanium strips or other metal strips cannot completely remove the zirconium oxide scales. , On the contrary, it causes the oxide skin to remain on the surface and be pressed into the metal in the subsequent processing, causing great damage to the surface of the subsequent processing strip, and a large number of scattered white spots and white lines appear on the surface, and the whole roll of strip will be scrapped

In short, the zirconium strips produced by the usual methods cannot meet the basic requirements of zirconium strips for welding thin zirconium materials and thin-walled zirconium tubes in nuclear power and chemical industry, etc., and titanium strips or other metal strips are used to produce zirconium strips The quality requirements cannot be met, so it is necessary to propose process improvement, develop and produce a zirconium and zirconium alloy strip with a length of 2000-10000m or more that has no welds in the length direction and whose surface quality and metallurgical properties can meet the above requirements.

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