Method for adding rare-earth element cerium in process of steel casting and melting
A technology of rare earth elements and cast steel, which is applied in the field of adding rare earth element cerium in the process of casting steel smelting, which can solve the problems of reducing the performance of steel castings, increasing inclusions, and difficulty in floating, etc., and achieves the effect of improving low temperature impact toughness and improving mechanical properties
Active Publication Date: 2019-11-22
KOCEL STEEL
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Problems solved by technology
However, if rare earth is added improperly, rare earth oxides will be formed, which are extremely difficult to float in steel, which will increase inclusions in steel, and even produce brittle intermetallic compounds of rare earth and iron, which will reduce the performance of steel castings
Method used
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Embodiment Construction
[0017] The technical solutions of the present invention will be further described in detail below in conjunction with the embodiments.
[0018] In the present invention, unless otherwise specified and limited, the terms should be understood in a broad sense, and those skilled in the art can understand the specific meanings of the terms in the present invention according to specific situations.
[0019] A method for adding rare earth element cerium in the smelting process of cast steel, the smelting process is EAF furnace+LF furnace+casting, specifically comprising the following steps:
[0020] EAF furnace smelting process control: add scrap iron and return material to EAF, the weight ratio of the scrap iron and return material is 5:5; After the temperature reaches 1530°C, take a clear sample to analyze the chemical composition. If the chemical composition meets the standard requirements, continue to heat up to 1590°C~1620°C and then carry out oxygen blowing decarburization; af...
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The invention belongs to the technical field of casting, and particularly relates to a method for adding rare-earth element cerium in the process of steel casting and melting. The smelting technological process comprises the following steps of performing treatment in an EAF stove, performing treatment in an LF stove and performing pouring treatment, and comprises the specific steps of performing EAF stove melting process control, performing LF stove melting process control and performing pouring process control, wherein during LF stove melting process control, if the temperature value is 1575DEG C-1600 DEG C and the oxygen activity is smaller than 5ppm, starting adding ferro-cerium alloy in batches, wherein the addition quantity of the ferro-cerium alloy in each batch is 10kg-15kg, and the addition quantity of the ferro-cerium alloy is controlled to be 2-3kg per tons of steel; and after the ferro-cerium alloy is completely added, performing tapping and pouring. According to the methodfor adding rare-earth element cerium in the process of steel casting and melting provided by the invention, the recovery rate of ferro-cerium is guaranteed, and inclusions in the steel can be sufficiently subjected to denaturation, so that the recovery rate of cerium elements can achieve 60% or so; and low-temperature impact toughness of cast steel products is notably increased, namely the mechanical properties of the cast steel products are increased.
Description
technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a method for adding rare earth element cerium in the smelting process of cast steel. Background technique [0002] Non-metallic inclusions in steel are mainly divided into three categories: sulfides, oxides, and nitrides. Sulfide inclusions mainly refer to manganese sulfide and iron sulfide inclusions. These inclusions are low in melting and easily soluble in steel. It is long and difficult to remove in the steelmaking process. It is the main source of non-metallic inclusions in steel castings, and sulfide inclusions are easily dissolved into steel, which will reduce the corrosion resistance of steel castings, especially Reduce pitting corrosion resistance and crevice corrosion resistance, while sulfide in steel will reduce the plasticity, toughness and fatigue resistance of steel castings. Rare earth elements are added to molten steel to form spherical rare earth su...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C22C33/06
CPCC22C33/006C22C33/06
Inventor 赵国伟张生存王平
Owner KOCEL STEEL