Oxide-strengthened low-activation steel, electroslag remelting slag system and smelting method

Abstract

The invention discloses an oxide-strengthened low-activation steel, an electroslag remelting slag system and a smelting method. The electroslag remelting slag system includes A slag and B slag, and the components of the A slag include: CaF 2 :40~55 copies, Y 2 o 3 : 30 to 35 parts, CaO: 20 to 30 parts; the composition of the B slag includes CaF 2 : 55-65 parts, CaO: 30-40 parts, MgO: 2-5 parts, SiO 2 : 3 to 7 parts; during smelting, a blind hole is processed inward from the upper end of the consumable electrode, filled with yttrium in the blind hole, the upper end of the consumable electrode is welded to the dummy electrode, and the consumable electrode Fix it at the smelting position, add slag A into the water-cooled crystallizer, and start arcing to make slag; start smelting after arcing, and add B slag after smelting to the designated position of the consumable electrode, and continue smelting until the end. The horizontal position corresponding to the bottom of the blind hole on the consumable electrode. The electroslag remelting slag of the present invention does not contain Al 2 o 3 , The smelting method can make full use of the electroslag remelting system of the present invention, improve the Y yield, and obtain a new oxide-strengthened low-activation steel.

Description

technical field [0001] The invention relates to the field of electrometallurgy, in particular to an oxide-strengthened low-activation steel, an electroslag heavy melting slag system and a smelting method. Background technique [0002] Due to its excellent performance, low-activation steel is generally considered to be the preferred structural material for future fusion demonstration reactors and fusion power reactors. It adopts a low-activation design, that is, the radioactivity of the material after service needs to drop to the limit level (10mSv / h) that can be recycled within 100 years. Therefore, high-activity elements Al, Ni, Cu, Nb, Existence of Mo and Sn. In order to further improve the mechanical properties of low-activation steel, scholars at home and abroad have passed a large number of experimental studies and applied powder metallurgy technology to develop Y 2 o 3 Oxide strengthened low activation steel. At present, the uniform dispersion of oxide dispersed ph...

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used slag system for electroslag remelting is CaF 2 Main raw material, add A1 2 o 3 , CaO and other oxides; the basic slag system has CaF 2 -A1 2 o 3 Slag system (70%CaF 2 -30% A1 2 o 3 ) and CaF 2 -CaO-A1 2 o 3 Slag system (60%CaF 2 -20% A1 2 o 3 -20% CaO and 40% CaF 2 -30% A1 2 o 3 -30%CaO) two series, the above slag series all contain a certain mass fraction of A1 2 o 3 , A1 during smelting 2 o 3 Will enter the molten steel and pollute the low-activation steel, resulting in an increase in its activity

At the same time Y 2 o 3 For rare earth oxides, the problem of extremely low recovery rate of rare earth (less than 5%) in the electroslag remelting process has not been solved

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