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Preparation process of high alloy hot work die steel

A technology of hot work die steel and preparation process, which is applied in the field of metallurgy, can solve the problems of low actual product quality index, distribution of carbides along the grain boundary, poor product preparation process, etc., and achieve the purpose and effect of upsetting, easy to realize, carbonization The effect of small particle distribution and increased degree of fragmentation

Active Publication Date: 2017-05-10
建龙北满特殊钢有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the materials produced by foreign manufacturers, there is still a certain gap in the purity of molten steel, uniform composition, fine structure, and precise size. The carbides in the structure are obviously distributed along the grain boundaries

Method used

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  • Preparation process of high alloy hot work die steel

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specific Embodiment approach 1

[0027] A preparation process of high-alloy hot work die steel, comprising the steps of:

[0028] Step 1. EBT primary refining in electric arc furnace, LF refining, VD vacuum degassing, and casting into high alloy hot work die steel electrode blanks;

[0029] Step 2. Perform electroslag remelting on the high alloy hot work die steel electrode blank produced in step 1 to obtain high alloy hot work die steel electroslag ingot, and enter the melted slag pool in the crystallizer from the high alloy hot work die steel electrode blank At the beginning, the high-alloy hot work die steel electrode blank is lifted from the crystallizer and the power supply is cut off. The smelting process is completed. According to the diameter of the mold, the melting speed of the whole remelting smelting process is set in different ranges. The average melting speed per hour (kg / h) = average crystallizer diameter D (mm) × A, A = 0.80 ~ 0.82 (kg / h.mm);

[0030] Step 3, performing high-temperature homo...

specific Embodiment approach 2

[0042] According to the preparation process of the high-alloy hot work die steel of specific embodiment one, the hot work die steel with 10% Cr content is on the basis of the H13 steel grade, increases Ni and Wo element content, and the Cr element content increases 5%, because As the alloy content increases, severe compositional segregation tends to occur inside the electroslag steel ingot, and the thermoplasticity of the steel ingot is poor during forging, making it more difficult to manufacture. The material itself has very strict requirements for carbide mesh, band, liquid analysis, inclusions, gas, and flaw detection. According to the characteristics of this steel type, the temperature and time of high-temperature homogenization of electroslag steel ingots before forging should be reasonably determined, and the forging method of multi-directional forging should be adopted during forging, so that the carbides can be broken to a certain extent and the fiber direction can be i...

specific Embodiment approach 3

[0044] According to the preparation process of the high-alloy hot work die steel of the specific embodiment 1, aiming at the chemical composition requirements of the finished product of the 10% Cr content hot work die steel, and considering the burning loss of easily burnt elements during electroslag remelting, first set The internal control billet composition of the steel type is determined.

[0045] The content of harmful elements Pb, Sn, As, Sb and Bi should be strictly controlled when selecting furnace materials for steel smelting. When the chemical element P and molten steel temperature are suitable, all slag is removed, and sufficient amount of slag is ensured. When the deoxidation is good, the slag turns white, and the steel is tapped when the tapping temperature is appropriate, and argon is blown at the same time as the tap is tapped. After the ladle arrives at the LF refining position, heat up the electric power, take a sample after heating for a certain period of ti...

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Abstract

The invention discloses a preparation process of high alloy hot work die steel and belongs to the technical field of metallurgy. A certain gap still exists between existing domestic high alloy hot work die steel and materials manufactured by foreign manufactures in the aspects of molten steel purity, constituent uniformity, structural fineness and dimensional accuracy. According to the preparation process, in the electroslag-remelting smelting process, the diameter of a crystallizer serves as a key parameter, and the mean melting rate of the smelting process is set through the diameter of the crystallizer; by raising the heating temperature of a steel ingot and prolonging retention time of a high-temperature section, nonuniformity of constituents of the steel ingot is remarkably reduced; an operation mode including three times of upsetting and three times of drawing-out is adopted for forging; according to a calculation method of the upsetting ratio, the ratio of heights, obtained before and after upsetting is conducted, of the steel ingot is adopted, operation can be easy and convenient to conduct, and the upsetting purpose and effect can be easy to achieve; the heat treatment temperature of quenching conducted after forging is completed is raised, and more alloying elements can be dissolved into austenite on the basis that a certain amount of carbide is reserved; and annealing is conducted through two temperature sections, and a spheroidized structure can be uniformly refined.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation process of high-alloy hot-working die steel. Background technique [0002] In recent years, my country has imported about 100,000 tons of high-end tool and die steel every year, with an output value of about RMB 6 billion. The high price not only increases the cost of manufacturing and production, but also seriously restricts the manufacturing capacity of high-end die steel in my country. The focus of the mold industry is to develop large-scale, precise, complex, and combined molds. There must be major breakthroughs in the high-strength, high-toughness, high-temperature resistance, and high wear-resistant materials required in aerospace, high-speed railways, electronics, and new energy. The development trend is that in the production process of die steel, it is generally developing in the direction of high purity, high isotropy, high toughness and hig...

Claims

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Application Information

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IPC IPC(8): C22C33/04C22B9/18C21D8/00C21D1/18C21D1/26
CPCC21D1/18C21D1/26C21D8/005C21D2211/009C22B9/18C22C33/04Y02P10/20
Inventor 姚凤祥刘洪波翟书研杨云志李庆斌李瑛李颇于瑞芝徐咏梅刘向军毛威昂唐刚张程范宇静贾俊林赵贺李明翟利志
Owner 建龙北满特殊钢有限责任公司
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