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.
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[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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