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Method for smelting high-quality high-speed steel by pressurized electroslag remelting technology

A high-quality technology of pressurized slag, applied in the field of high-speed steel smelting, can solve the problems of increasing the cooling rate of ingots, large air gap between ingots and molds, etc. The effect of efficiency

Inactive Publication Date: 2017-06-13
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the air gap between the ingot and the crystallizer is relatively large in the process of smelting high-speed steel using the traditional electroslag remelting technology, which limits the further improvement of the cooling rate of the ingot, the invention provides a method using pressurized electroslag remelting technology. Smelting method for smelting high-speed steel by remelting technology

Method used

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  • Method for smelting high-quality high-speed steel by pressurized electroslag remelting technology
  • Method for smelting high-quality high-speed steel by pressurized electroslag remelting technology
  • Method for smelting high-quality high-speed steel by pressurized electroslag remelting technology

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Effect test

Embodiment 1

[0026] M42 high-speed steel was smelted by pressurized electroslag remelting technology, and its chemical composition is shown in Table 1. The crystallizer diameter is 200mm, the electrode diameter is 140mm, and the electrode insertion depth is 15mm.

[0027] Table 1 M42 high-speed steel chemical composition range (wt.%)

[0028]

[0029] The steps to smelt M42 high-speed steel using pressurized electroslag remelting technology are as follows:

[0030] (1) Preparation of slag

[0031] First prepare slag, the mass percentage of slag is CaF 2 : 55%, CaO: 20%, Al 2 o 3 : 20%, SiO 2 : 5%, the amount of slag is 10kg, put it into the resistance furnace after mixing, bake at 600°C for 5 hours, remove the moisture in the slag, and then turn off the power to let the slag cool down with the furnace; The bottom pad, slag and arc ignition chips of the same material are placed in the center of the bottom water tank;

[0032] (2) Molten slag

[0033] Install the upper furnace she...

Embodiment 2

[0044]M2 high-speed steel was smelted by pressurized electroslag remelting technology, and its chemical composition is shown in Table 3 below. The crystallizer diameter is 350mm, the electrode diameter is 220mm, and the electrode insertion depth is 10mm.

[0045] Table 3 M2 high-speed steel chemical composition range (wt.%)

[0046]

[0047] The steps to smelt M2 high-speed steel using pressurized electroslag remelting technology are as follows:

[0048] (1) Preparation of slag

[0049] First prepare slag, the mass percentage of slag is CaF 2 : 70%, Al 2 o 3 : 30%, the amount of slag is 30kg, put it into the resistance furnace after mixing, bake at 600°C for 5 hours, remove the moisture in the slag, and then turn off the power to let the slag cool down with the furnace; The bottom pad, slag and arc ignition chips of the same material are placed in the center of the bottom water tank;

[0050] (2) Molten slag

[0051] Install the upper furnace shell to close the furna...

Embodiment 3

[0062] The W9Mo3Cr4V high-speed steel was smelted by pressurized electroslag remelting technology, and its chemical composition is shown in Table 5 below. The crystallizer diameter is 500mm, the electrode diameter is 350mm, and the electrode insertion depth is 10mm.

[0063] Table 5 W9Mo3Cr4V high-speed steel chemical composition range (wt.%)

[0064]

[0065] The steps to smelt W9Mo3Cr4V high-speed steel using pressurized electroslag remelting technology are as follows:

[0066] (1) Preparation of slag

[0067] First prepare slag, the mass percentage of slag is CaF 2 : 40%, CaO: 30%, Al 2 o 3 : 30%, the amount of slag is 66kg, put it into the electric resistance furnace after mixing, bake at 600°C-800°C for 4-6 hours, remove the moisture in the slag material, then turn off the power to let the slag material cool down with the furnace; The bottom pad, slag and arc ignition scraps of the same material as the steel to be smelted are placed in the center of the bottom wat...

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Abstract

The invention provides a smelting method for smelting high-quality high-speed steel by a pressurized electroslag remelting technology. The smelting method specifically comprises the following steps: slag is prepared and molten; after melting down of the slag, the pressure in a smelting chamber is gradually increased to 2-3 MPa, and meanwhile, the pressure of cooling water is increased for electroslag remelting; the feeding operation is performed in later smelting period; after the smelting is finished, the gas pressure and cooling water pressure in the smelting chamber are reduced; and an ingot is cooled to the room temperature under normal pressure. The method for smelting the high-quality high-speed steel can reduce an air gap between the ingot and a crystallizer, accelerates the cooling speed, accelerates refining of a solidification structure, and improves red hardness and wear resistance of the high-speed steel.

Description

technical field [0001] The invention relates to a high-speed steel smelting method, in particular to a high-quality high-speed steel smelting method using pressurized electroslag remelting technology. Background technique [0002] High-speed steel generally refers to heat-resistant steel with high hardness in use. Since this steel contains a large amount of alloying elements such as tungsten, molybdenum, chromium, vanadium, etc., more eutectic carbides are formed in the as-cast structure, that is, Lay Because of its microstructure, it is also called ledeburite steel. Because high-speed steel can still maintain high hardness and high wear resistance at 500 ° C to 600 ° C, it is widely used in the production of high-speed cutting tools, cold extrusion dies and dies. [0003] Because high-speed steel contains high carbon and alloy elements, it is difficult to avoid carbon segregation during solidification, and it is easy to form coarse network carbides on grain boundaries, res...

Claims

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Application Information

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IPC IPC(8): C22B9/18C22C33/04
CPCC22B9/18C22C33/04
Inventor 姜周华刘福斌余嘉李花兵耿鑫陈奎李星钱瑞清
Owner NORTHEASTERN UNIV
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