Method for preparing parent metal of nuclear-electric welding material with ultrahigh purity

Abstract

The invention belongs to the research field of welding materials, relating to a method for preparing a parent metal of a nuclear-electric welding material with ultrahigh purity. The method is characterized in comprising the following steps of: adopting a normal vacuum induction smelting furnace; pouring an ingot mold from the bottom through a central casting pipe of a pouring mould to obtain a cast ingot; and performing the steps of electrical slagging, forging, rolling and drawing to finally obtain the welding material. The pouring mould consists of three parts which comprise the central casting pipe, a bottom pouring way and the ingot mold, wherein liquid steel is evenly smelted in a crucible, and is firstly poured into the central casting pipe and secondly into the ingot mold from the bottom when pouring. As the existing vacuum upper pouring technology is replaced with a new vacuum bottom pouring liquid steel technology, the parent metal of the welding material is prepared; and with the steps of the electrical slagging, the forging, the rolling and the drawing, the synthetical impurity content (comprising oxide, sulfide, nonmetallic inclusion, gas and the like) of the welding material can be reduced from 200-300ppm to be lower than 100ppm, thereby greatly improving the purity of a cast ingot and the structural homogeneity, improving the yield, and reducing the production cost.

Description

technical field [0001] The invention belongs to the field of welding material research and relates to a method for preparing an ultra-high-purity nuclear power welding base material. Background technique [0002] Energy issues have become a bottleneck restricting the sustainable, rapid and balanced development of the world economy and environment. As a clean, efficient, safe and economical new energy source, nuclear power has become one of the most suitable renewable energy sources for development. In 2007, the State Council also approved the National Development and Reform Commission's "National Nuclear Power Mid- and Long-term Development Plan". The initial planning goal is to build an installed capacity of 40 million kilowatts by 2020, and to truly achieve independent design, independent construction, independent manufacturing, and independent operation in the nuclear power field. [0003] Owning large-scale advanced nuclear power technology with independent intellectual ...

AI Technical Summary

Problems solved by technology

At present, when the ingot is smelted by the vacuum induction melting process in the country, the molten steel is poured into the ingot mold directly from the top of the ingot mold after the high temperature smelting is uniform in the vacuum chamber, that is, the method of pouring the ingot is poured, which will easily lead to inclusions. And gas, etc. have no time to float up, and as the molten steel solidifies, it remains in the ingot, resulting in a decrease in purity, which cannot meet the stringent quality requirements of nuclear power for welding consumables

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