Oxide dispersion strengthening low activity ferrite/martensite steel and smelting method thereof

Abstract

The invention discloses oxide dispersion strengthening low activity ferrite / martensite steel and a smelting technology and a smelting method of the oxide dispersion strengthening low activity ferrite / martensite steel, and belongs to the technical field of special steel metallurgy. The oxide dispersion strengthening low activity ferrite / martensite steel comprises raw materials including, by mass percent, 8.9%-9.1% of electrolytic chromium, 0.4%-0.5% of electrolytic manganese, 0.05%-0.08% of high-purity silicon, 0.08%-0.12% of high-purity graphite, 1.4%-1.6% of metal tungsten, 0.1% of metal tantalum, 0.18%-0.22% of metal vanadium, 0.1%-0.25% of sponge titanium, 0.2%-0.5% of high-purity rare earth yttrium, 1% of oxide scales and the balance high-purity low-sulfur low-phosphorus pig iron. A preparing method of the oxide dispersion strengthening low activity ferrite / martensite steel comprises material preparing, vacuum induction smelting, casting, forging and electroslag remelting processes, ODS-RAFM is prepared, and the large-specification ODS steel high in density, uniform in component, little in energy consumption, high in purity, stable in smelting method and capable of meeting the need of large nuclear power equipment is achieved.

Description

technical field [0001] The invention belongs to the technical field of special steel metallurgy, and in particular relates to an oxide dispersion strengthened low-activation ferrite / martensitic steel and a smelting method thereof. Background technique [0002] The development of nuclear energy has reached the IX generation, and the working environment in the reactor has become more severe. Materials, especially the first wall / cladding materials, are the key issues to realize the "efficient, safe and economical" operation of the fourth generation nuclear reactor. Low-activation ferritic / martensitic steel (RAFM) has been selected as the preferred structural candidate material for fusion reactor cladding due to its low radiation swelling rate, thermal expansion coefficient, and high thermal conductivity as well as good mechanical properties, These materials have high thermal conductivity and resistance to neutron radiation damage at 300-500 °C. However, its insufficient high-t...

AI Technical Summary

Problems solved by technology

[0004] The ODS steel prepared by the above mechanical alloying process can improve the high temperature performance of the alloy to a certain extent, but due to the different mechanical alloying equipment used and the many process parameters to be controlled, the stability and weight of the current mechanical alloying process are caused. Poor performance, it is difficult to form a unified operating standard to achieve mass production

Moreover, the process has inherent problems such as easy pollution and oxidation of the powder, low compactness of the finished product, and many defects. It is difficult to prepare steel with the same cleanliness, structure and performance.

At the same time, the lack of large-scale mechanical alloying and forming equipment hinders the industrial application of ODS steel