Preparation method of nuclear-grade zirconium alloy cast ingot

Abstract

The invention belongs to the technical field of zirconium alloy preparation and particularly relates to a preparation method of a nuclear-grade zirconium alloy cast ingot. The preparation method comprises the following steps that (1) the alloy component and the total mass of the finished cast ingot are determined; (2) an intermediate alloy and an alloy cladding are prepared; (3) material mixing isconducted; (4) electrode pressing is conducted; (5) N electrodes are welded into one electrode; (6) vacuum self-consuming arc melting is conducted; and (7) surface machining and dead head cutting areconducted. According to a technology suitable for industrial scale production and used for preparation of the Zr-Sn-Nb-Fe / Cr zirconium alloy cast ingot, the technological economical efficiency can beobviously improved, meanwhile component evenness control over the cast ingot is superior to that of a traditional technology, and the preparation method can be used for industrial scale production ofthe nuclear-grade zirconium alloy cast ingot accordingly.

Description

Technical field [0001] The invention belongs to the technical field of zirconium alloy preparation, and specifically relates to a method for preparing nuclear grade zirconium alloy ingots. Background technique [0002] The preparation of nuclear zirconium alloy ingots includes: composition calculation, alloy element addition, mixing, electrode block forming, vacuum welding electrodes, vacuum melting and other technologies. In the preparation of zirconium alloy ingots, the addition of alloying elements generally adopts the method of adding a master alloy or an alloy package. At the same time, a certain proportion of return material can be added to improve economy. The return material is prepared by recycling the residual material generated during the processing. Since the development of vacuum consumable remelting (VAR) technology abroad in the 1950s, the use of VAR to prepare ingots has become the first choice for nuclear-grade zirconium alloys for reactors. The main equipment o...

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Problems solved by technology

[0010] At present, the preparation technology of zirconium alloy ingots is mainly: intermediate alloy elements such as Sn, Fe, etc. are added in the form of intermediate alloy button ingots (30g~100g), and nuclear-grade zirconium alloy ingots are prepared by multiple vacuum consumable electrode arc melting , this technology has played an active role in the preparation of small ingots (within 200kg), but for large ingots (above 1000kg) produced on an industrial scale, the traditional way of adding alloy elements is to melt a furnace of sub-ton zirconium alloy Finished ingots need to prepare hundreds of intermediate alloy button ingots, the intermediate alloy preparation cycle is long and the composition uniformity is difficult to control