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Method for preparing high-purity h13 hot work die steel by aluminum rare earth composite deoxidation

A technology of hot work die steel and composite deoxidation, applied in the improvement of process efficiency, furnace, electric furnace, etc., can solve the problems of high total oxygen content, nitrogen content and inclusion content, and achieve the reduction of inclusion grade, performance improvement, shortening Gap effect

Active Publication Date: 2019-02-19
中科西王特钢有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing high-purity H13 hot work die steel by using aluminum rare earth composite deoxidation to solve the problems of high total oxygen content, nitrogen content and inclusion content of hot work die steel H13 in the prior art, effectively Improve the purity of H13 steel

Method used

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Embodiment 1

[0032] In this embodiment, the electric furnace is 70 tons, and the carbon content is 2.5wt%. When tapping, the phosphorus content in molten steel is 0.003wt%, and the carbon content is 0.08wt%. Add 1.5kg of aluminum per ton to the steel, add high alumina pre-slag (the content of alumina in the pre-slag is 35wt%), add 20kg of calcium carbide during the refining process, the refining slag foams well, and before vacuum degassing, the sulfur in the steel The content is 0.001wt%. After entering the vacuum degassing treatment station, the argon flow rate is 165L / min. After vacuum degassing, the measured dissolved oxygen is 4ppm, and the T.O is 25ppm. Add 0.05wt% rare earth element Ce, and use argon soft stirring (weak stirring) 20min. The test results of the billet after forging show: T.O=10ppm, S=0.0008wt%, N=83ppm. Inclusions: B+D≤2.0 level, A+C≤0.5 level.

Embodiment 2

[0034] In this embodiment, the electric furnace is 40 tons, and the carbon content is 1.8wt%. When tapping, the phosphorus content in molten steel is 0.002wt%, and the carbon content is 0.05wt%. Add 2kg / ton of aluminum to the steel, add high alumina pre-melted slag (the alumina content in the pre-melted slag is 40wt%), add 20kg of silicon carbide during the refining process, the refining slag is well foamed, and the sulfur content in the steel before vacuum degassing It is 0.0015wt%. After entering the vacuum degassing treatment station, the argon flow rate is 150L / min. The measured dissolved oxygen after vacuum degassing is 4ppm, and T.O is 25ppm. Add 0.05wt% rare earth element La, and use argon soft stirring ( Weak stirring) 20min. The test results of the billet after forging show: T.O=12ppm, S=0.0009wt%, N=80ppm. Inclusions: B+D≤1.5 level, A+C≤0.5 level.

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Abstract

The invention relates to the field of H13 die steel preparation, in particular to a method for preparing high-purity H13 hot work die steel through aluminum rare earth complex deoxidation. The problem of high total oxygen content, nitrogen content and inclusion content of H13 hot work die steel in the prior art is solved, and the purity of the H13 steel is effectively improved. The method includes the following steps that dissolved oxygen is controlled during steel tapping of an electric furnace, aluminum deep-deoxidation is adopted during steel tapping, and high-alkalinity reducing slag is formed in a ladle refining station; strong argon stirring is adopted in a vacuum degassing station; rare earth element treatment is performed after vacuum degassing is finished; and weak argon stirring is adopted before pouring. By means of the method for preparing the high-purity H13 hot work die steel through aluminum rare earth complex deoxidation, the total oxygen content (T.O) in the steel can be controlled to be 12 ppm or below, the sulphur content can be controlled to be 0.001wt% or below, the N content in the steel is controlled to be 85 ppm or below, and the inclusion grade can be remarkably lowered; and the properties are remarkably improved after heat treatment is finished.

Description

technical field [0001] The invention relates to the field of H13 die steel preparation, in particular to a method for preparing high-purity H13 hot work die steel by using aluminum rare earth composite deoxidation. Background technique [0002] Hot work die steel H13 is widely used domestically, but its preparation level has not yet reached the level of imported die steel. The main reason is that the purity of the steel is not high. Among them, the total oxygen content (T.O) of domestic H13 steel is mostly above 15ppm, while that of imported die steel is below 12ppm. Domestic inclusion grades are B+D≥2.5 and A+C≥1.5, while foreign inclusion control levels are lower than this level. In addition, the nitrogen content of foreign high-quality die steel is controlled below 90ppm, while most of the domestic ones are above 90ppm. Due to the gap in the purity of steel, it is difficult for domestic hot work die steel H13 to enter the high-end die market. Therefore, there is an urg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/10C21C5/52
CPCC21C5/52C21C7/06C21C7/10Y02P10/20
Inventor 刘宏伟傅排先胡小强栾义坤夏立军李殿中李依依
Owner 中科西王特钢有限公司
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