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Large-scale electroslag remelting pre-feeding and hot top sealing control method

A technology of electroslag remelting and control method, which is applied in the field of large-scale electroslag remelting prefeeding and heat capping control, which can solve the problems of shrinkage cavity in the center of the steel ingot and the difficulty of cooling water to meet the requirements of solidification, and achieve the amount of head cutting Reduce and improve the quality of steel ingot feeding and high economic benefits

Pending Publication Date: 2022-04-29
合智熔炼装备(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the production of large steel ingots and large forgings requires multiple pier pulls, in order to facilitate pier thickness, a smaller height-to-diameter ratio is usually required when designing steel ingots. When the diameter of the electroslag ingot is too large, the cooling water effect is difficult to meet the solidification of the central part. Therefore, shrinkage cavity, looseness, slag inclusion and other low-magnification defects often appear in the center of the steel ingot after solidification

Method used

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  • Large-scale electroslag remelting pre-feeding and hot top sealing control method
  • Large-scale electroslag remelting pre-feeding and hot top sealing control method
  • Large-scale electroslag remelting pre-feeding and hot top sealing control method

Examples

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Effect test

Embodiment 1

[0045] This embodiment provides a pre-feeding and heat-capping control method for an ingot-type 22t electroslag ingot. The smelted steel type is A steel type, and the melting and controlled solidification are completed in a protective atmosphere electroslag furnace to form the required electroslag ingot. , electrode weight M = 22t, crystallizer diameter D junction = 1200mm, electrode diameter d pole = 960mm, the remaining height of the electrode at the end of heat capping is 5mm, and the electrode weight at the end of heat capping is set to 280kg, according to the large electroslag remelting prefeeding and The whole technological process of the thermal capping control method figure 1 As shown, it specifically includes the following technological process:

[0046] Step 1: In the arcing stage and the steady state stage, the smelting is controlled by the melting speed, and the melting speed is set as V1=MR=15.6kg / min (the melting speed setting value varies with the smelting steel...

Embodiment 2

[0061] This embodiment provides a pre-feeding and heat-capping control method for an ingot-type 25t electroslag ingot. The smelted steel type is B steel type, and the melting and controlled solidification are completed in a protective atmosphere electroslag furnace to form the required electroslag ingot , electrode weight M = 25t, crystallizer diameter D junction = 1320mm, electrode diameter d pole = 1050mm, the remaining height of the electrode at the end of heat capping is 4mm, and the electrode weight at the end of heat capping is set at 270kg, according to the large electroslag remelting prefeeding and The whole technological process of the thermal capping control method figure 1 As shown, it specifically includes the following technological process:

[0062] Step 1: In the arcing stage and the steady state stage, the smelting is controlled by the melting speed, and the melting speed is set as V1=MR=16.3kg / min (the melting speed setting value varies with the smelting steel...

Embodiment 3

[0077] This embodiment provides a pre-feeding and heat-capping control method for an ingot-shaped 30t electroslag ingot. The smelted steel type is C steel type, and the melting and controlled solidification are completed in a protective atmosphere electroslag furnace to form the required electroslag ingot , electrode weight M = 30t, crystallizer diameter D junction = 1350mm, electrode diameter d pole = 1080mm, the remaining height of the electrode at the end of heat capping is 3mm, and the electrode weight at the end of heat capping is set to 216kg, according to the large electroslag remelting prefeeding and The whole technological process of the thermal capping control method figure 1 As shown, it specifically includes the following technological process:

[0078] Step 1: In the arcing stage and the steady state stage, the melting rate is controlled by the melting rate, and the melting rate is set as V1=MR=18.0kg / min (the setting value of the melting rate varies with the type...

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Abstract

The invention relates to a large-scale electroslag remelting stage in a large-scale electroslag remelting pre-feeding and hot top sealing control method. The large-scale electroslag remelting stage comprises an arcing stage, a steady state stage, a pre-feeding stage and a hot top sealing stage. The large-scale electroslag remelting pre-feeding and hot top sealing control method comprises the following steps: when the weight of a steel ingot in a pre-feeding stage is 81%-86% of the initial weight of an electrode, entering an electroslag remelting pre-feeding stage; when the weight of the steel ingot in the hot top sealing stage is 88-92% of the initial weight of the electrode, entering an electroslag remelting hot top sealing stage; the feeding effect of the electroslag ingot of the gas protection electroslag furnace can be effectively optimized, and the quality of the feeding end of the electroslag ingot is improved; the head cutting amount of the feeding end of the electroslag ingot can be reduced, the economic benefit is high, and the yield is high; the comprehensive yield of steel ingots is improved; and the solidification quality of the smelting electrode in the later stage of electroslag remelting can be improved.

Description

technical field [0001] Embodiments of the present invention relate to a remelting pre-feeding and thermal capping control method, in particular to a large-scale electroslag remelting pre-feeding and thermal capping control method. Background technique [0002] Electroslag remelting is a special metallurgical method that uses the resistance heat generated when current passes through slag in a water-cooled crystallizer to remelt and refine metals or alloys, and sequentially solidify them into ingots or castings. [0003] The electroslag remelting process is generally divided into three stages: the arcing stage, the steady state stage, and the heat capping stage. In the electroslag remelting process, the main purpose of the first stage of the arcing stage is to create a good slag to form a stable molten pool. In the second stage of the steady state stage, a large amount of electrode materials are melted, and the melting rate is controlled to achieve controlled solidification. I...

Claims

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Application Information

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IPC IPC(8): C22B9/18B22D23/10
CPCC22B9/18B22D23/10
Inventor 丁磊高杰李庄
Owner 合智熔炼装备(上海)有限公司