Manufacture method of nuclear grade zirconium-niobium alloy cast ingot

Abstract

The invention relates to the field of a manufacture method of a nuclear grade zirconium-niobium alloy cast ingot, adopting the following technical scheme: firstly, forming a pure niobium bar and sponge zirconium into zirconium-niobium master alloy scraps by the steps of pressing an electrode block, firstly smelting, secondly smelting and thirdly smelting, and the like; using the zirconium-niobium master alloy scraps and the sponge zirconium to form the zirconium-niobium alloy cast ingot by the steps of materials mixing, materials distributing, electrodes manufacturing and vacuum self-consumable electric arc smelting; and detecting that the zirconium-niobium alloy cast ingot has no defects such as components segregation and niobium impurity, and the like, to complete the manufacture of the nuclear grade zirconium-niobium alloy cast ingot. The nuclear grade zirconium-niobium alloy cast ingot has even components, has no metallurgical defects such as niobium impurity, and the like, has high raw materials yield, saves the production cost to a certain degree, and voids the waste.

Description

technical field [0001] The invention relates to the field of a method for preparing a nuclear-grade zirconium-niobium alloy ingot. Background technique [0002] Nuclear-grade zirconium-niobium alloy ingots are mainly used in the manufacture of zirconium materials for advanced nuclear reactors. At present, the grades of zirconium materials used in my country's Daya Bay Nuclear Power Station are M5 and the grades of zirconium materials used in Tianwan Nuclear Power Station are E110. Both belong to the category of zirconium-niobium alloys. Among them, the addition of niobium components is to improve the corrosion performance of the final zirconium material, but the niobium components have a high melting point (2468°C) and a high density (8.40g / cm 3 ), if niobium scraps / strips are added when preparing ingots, because the overall niobium content is not high, the uniformity of its composition is not easy to control. May fall into the molten pool in the solid state, forming niobiu...

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for preparing a nuclear-grade zirconium-niobium alloy ingot with high quality stability, which can improve the phenomenon of uneven components and niobium inclusions in the zirconium-niobium alloy ingot produced by the existing process, thereby avoiding uneven components such as niobium inclusions. Uniform metallurgical defects appear, improve the yield of raw materials, and save material loss