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Process for smelting high-speed steel through intermediate frequency furnace-LF furnace-VD

An intermediate frequency furnace and high-speed steel technology, applied in the field of iron and steel metallurgy, can solve the problems of low alloy recovery rate, low smelting efficiency, poor product performance, etc., and achieve the effect of good slag removal, improved metal recovery rate and less dust pollution.

Active Publication Date: 2022-04-29
丹阳市曙光新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an intermediate frequency furnace-LF furnace-VD process for smelting high-speed steel, which solves the problems of low alloy recovery rate, low smelting efficiency, serious environmental pollution, high energy consumption and poor product performance in the existing smelting process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] M2(CW6Mo5Cr4V2) high-speed steel is smelted in a factory's 20t intermediate frequency furnace -20t LF furnace -VD vacuum treatment production line. The internal control standard of chemical composition (by weight percentage) is: C 0.86～0.94％%, Mn 0.20～0.35％%, Si 0.25～0.35％%, S ≤ 0.005%, P.

[0049] The smelting process includes the following steps:

[0050] (1) intermediate frequency furnace roughing: taking steel ingot cutting head, rolling waste and waste drill bits as charging materials, sorting and cleaning before entering the furnace, and strictly controlling impurities entering the furnace; Select 20t furnace charge, add it to the intermediate frequency furnace in batches, electrify it until it is completely melted, measure the temperature to 1500℃, and sample it for spectral analysis. The results of the first analysis are shown in Table 1:

[0051] Table 1 Results of the first spectral analysis of intermediate frequency furnace (wt%)

[0052] C 硅 锰 P S 铜...

Embodiment 2

[0068] M2(CW6Mo5Cr4V2) high-speed steel is smelted in a factory's 20t intermediate frequency furnace -20t LF furnace -VD vacuum treatment production line. The internal control standard of chemical composition (by weight percentage) is: C 0.86～0.94％%, Mn 0.20～0.35％%, Si 0.25～0.35％%, S ≤ 0.005%, P.

[0069] The smelting process includes the following steps:

[0070] (1) intermediate frequency furnace roughing: steel ingot cutting head and waste drill bits are used as charging materials, and before entering the furnace, sorting and cleaning are carried out, and impurities are strictly controlled to enter the furnace; Select 20t furnace charge, add it to the intermediate frequency furnace in batches, electrify it until it is completely melted, measure the temperature to 1492℃, and sample it for spectral analysis. The results of the first analysis are shown in Table 6:

[0071] Table 6 Results of the first spectral analysis of intermediate frequency furnace (wt%)

[0072] C 硅...

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Abstract

The invention belongs to the technical field of ferrous metallurgy, and discloses a process for smelting high-speed steel through an intermediate frequency furnace, an LF furnace and a VD. The method comprises the following steps: firstly, melting a steel material in an intermediate frequency furnace, smelting until the steel material is melted down, adjusting chemical components, deoxidizing and slagging, carrying out power transmission heating, tapping, feeding into an LF furnace for smelting, heating to 1470-1510 DEG C, and adjusting the chemical components; and finally, feeding into a VD furnace for vacuum treatment, and tapping after the components are qualified. According to the method, the slagging process in the intermediate frequency furnace is adopted, rough adjustment of chemical components, preliminary deoxidation and slagging are conducted in the intermediate frequency furnace, the tapping temperature of the intermediate frequency furnace can be controlled within 1550 DEG C, rapid heating and slag adjustment can be conducted after the molten steel reaches the LF furnace, the LF smelting time is shortened, the smelting quality can be guaranteed, and the oxygen content of the molten steel subjected to VD vacuum treatment can be controlled within 10 ppm. According to the process, the oxygen content is greatly reduced, the smelting time is greatly shortened, and the production efficiency and the tapping quality are improved.

Description

Technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to a process for smelting high-speed steel by intermediate frequency furnace -LF furnace -VD. technical background [0002] Electric arc furnace -LF furnace (ladle refining furnace) -VD (vacuum degassing) process is the mainstream process for smelting high-speed steel at present. The process uses electric arc furnace as roughing furnace, and its main functions are melting raw materials, heating up, dephosphorization, etc. In order to ensure the cleanliness of steel, slag should be removed after electric arc furnace smelting. When molten steel is poured into ladle, slag materials such as lime are added. The steel and slag materials are mixed and washed to help melt slag, and then transferred to LF furnace station for refining. The main functions of LF furnace are deoxidation, precise adjustment of steel chemical composition and temperature adjustment. The function of VD ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C22C38/02C22C38/04C22C38/24C22C38/22C21C5/52C21C7/10C21C7/06C21C7/064C21C7/00
CPCC22C33/06C22C38/02C22C38/04C22C38/24C22C38/22C21C5/5241C21C7/0075C21C7/10C21C7/06C21C7/064C21C7/0087C21C7/0006Y02P10/20C22C38/06C22C38/44C22C38/46C22C38/002C22C38/42C21C5/52
Inventor 李亚波柴剑诸葛飞虎王银娣陈静陈坤陈思远
Owner 丹阳市曙光新材料科技有限公司
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