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A kind of preparation method of nuclear grade zirconium alloy ingot

A zirconium alloy and ingot technology is applied in the field of nuclear-grade zirconium alloy ingot preparation, which can solve the problems of long preparation period of intermediate alloy and difficult control of composition uniformity, and achieve the effect of improving process economy.

Active Publication Date: 2019-08-13
NUCLEAR POWER INSTITUTE OF CHINA
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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

Method used

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Embodiment Construction

[0058] The technical solutions of the present invention will be described in detail below in conjunction with specific embodiments.

[0059] A method for preparing a nuclear-grade zirconium alloy ingot according to the present invention is aimed at ingots produced on an industrial scale, comprising the following steps:

[0060] (1) Determine the alloy composition of the finished ingot and the total mass of the finished ingot

[0061] In this embodiment, the alloy composition of the finished ingot is Zr-Sn-Nb-Fe / Cr, wherein Sn: 0.3-1.2wt.%, Nb: 0.3-1.2wt.%, Fe or Cr: 0.1-0.5wt. %, O: 600-1500ppm; the total mass of the finished ingot ≥ 1000kg;

[0062] (2) Preparation of Master Alloy and Alloy Ladle

[0063] (2.1) Preparation of ZrNb master alloy

[0064] Prepare a ZrNb master alloy in a vacuum melting furnace, and the Nb content in the ZrNb master alloy is 40-60wt.%. The preparation process is as follows:

[0065] Put zirconium sponge and metal Nb into a water-cooled copper...

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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 in particular relates to a method for preparing a nuclear-grade zirconium alloy ingot. Background technique [0002] The preparation of zirconium alloy ingots for nuclear use includes: composition calculation, addition of alloy elements, material mixing, electrode block forming, vacuum welding electrodes, vacuum melting and other technologies. The addition of alloy elements in the preparation of zirconium alloy ingots generally adopts the method of adding master alloy or alloy bag, and at the same time, a certain proportion of return materials can be added to improve economic efficiency. The return materials are prepared by recycling the residual materials generated during the processing. Since the development of vacuum self-consumable remelting (VAR) technology abroad in the 1950s, at present, the use of VAR to prepare ingots has become the preferred method for nuclear-gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/03C22B9/20C22C16/00C22C27/02
CPCC22B9/20C22C1/03C22C16/00C22C27/02Y02P10/25
Inventor 蒋明忠彭倩潘钱付邱绍宇杨忠波孙超王录全
Owner NUCLEAR POWER INSTITUTE OF CHINA
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