Rare earth steel and preparation method thereof

Abstract

The invention discloses rare earth steel and a preparation method of the rare earth steel. The rare earth steel comprises the following components of, in percentage by weight, 0.01%-0.05% of C, 0.15%-0.3% of Si, 0.4%-0.5% of Mn, 8%-10% of Cr, 2%-2.5% of W, 0.2%-0.25% of V, 0.05%-0.1% of Ta, 0.001%-0.01% of Zr, 0.3%-0.6% of Y<2>O<3> and the balance Fe; during preparation, Cr, W, Ta, Fe, Si, Mn andY are smelted into metal mother liquor, then mixed gas of CO<2> and Ar serving as an oxidizing agent is introduced into the alloy mother liquor, Y is oxidized into Y<2>O<3>, Zr, V and C are added, casting is performed after melting down; electroslag remelting is carried out on a cast ingot in a protective atmosphere, purifying is carried out; austenitizing is carried out on a purified steel ingot,then the steel ingot is subjected to pressure machining to form a steel plate, water cooling is carried out after pressure machining; and heat treatment is carried out on the steel plate obtained through pressure machining, a yttrium nanometer precipitated phase is precipitated from the steel plate, and the rare earth steel is obtained. According to the rare earth steel and the preparation methodof the rare earth steel, RAFM ( Reduced Activation Ferritic / Martensitic ) steel can be produced in a smelting and casting mode, the yield of the RAFM steel can be increased, and meanwhile the high-temperature mechanical property of the RAFM steel is improved.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a rare earth steel and a preparation method thereof. Background technique [0002] Low activation ferritic / martensitic steel (Reduced Activation Ferritic / Martensitic, RAFM) has the advantages of low activation, low radiation swelling rate, excellent mechanical properties, thermophysical properties and mature technical foundation, etc. The preferred structure of cladding structural materials for fusion reactors. The designed operating temperature range of RAFM steel is 325-550°C, which cannot meet the requirements of CFETR Phase II and future nuclear fusion reactors. In order to improve the high-temperature mechanical properties of RAFM steel, a high melting point rare earth oxide disperse phase (Y 2 o 3 ) to prepare ODS-RAFM steel has become a good solution. Y 2 o 3 The melting point of the oxide is 2417°C, which has good thermal stability and does not c...

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Problems solved by technology

At present, the main preparation method of ODS steel is powder metallurgy (Powder metallurgy, PM), but PM-ODS steel preparation technology has disadvantages such as complex process and low efficiency, powder is easily oxidized and polluted, poor economy and poor product reproducibility.

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