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Automatic feeding process for constant melting speed electroslag furnace

A technology of electroslag furnace and melting rate, which is applied in the field of automatic feeding process of electroslag furnace with constant melting rate, can solve the problems of difference in quality level, unstable feeding quality of the riser end of electroslag ingot, etc.

Active Publication Date: 2021-11-26
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to the instability of the feeding quality at the riser end of the electroslag ingot
With the same feeding method, the shrinkage cavity defect in the riser of the electroslag ingot with good feeding control can be controlled below 50mm, while the shrinkage cavity defect in the riser of the electroslag ingot with poor shrinkage control can reach about 200mm, and the difference in quality level is very obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1: An automatic feeding process for constant melting rate electroslag furnace, using 42CrMoA steel, ingot size: 7.6 tons, crystallizer: Φ790 / 830mm, quantity: 3 pieces, slag system: CaF 2 :Al 2 o 3 :CaO=65:30:5, slag amount: 300kg, consumable electrode specification is Φ600mm die casting slab, and the set melting rate in the normal stage of electroslag remelting is 9.5kg / min.

[0016] According to t =7~10v, the theoretical total time of electroslag remelting feeding stage is theoretically calculated to be 67~95min.

[0017] When the real-time melting rate drops to (0.80~0.70) times the set melting rate for remelting, the theoretically calculated range of melting rate at the beginning of the second feeding stage is 7.6~6.6kg / min, and the melting rate at the beginning of the fourth feeding stage The range of melting rate is 3.8~2.8kg / min. Set the melting rate at the beginning of the second feeding stage to 7kg / min, and set the melting rate at the beginning of th...

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Abstract

The invention relates to an automatic feeding process for a constant melting speed electroslag furnace. The change of an instantaneous melting rate is used as a control center in a feeding stage, and the actual feeding time is not fixed, and specifically determined according to a feeding weight arrival node. The feeding process is divided into five stages, wherein the first stage and the third stage are power decrease stages, and the second stage and the fourth stage are power maintaining stages; the main feeding process is the second stage and the fourth stage, and the fifth stage is a heat preservation stage; and the specific time of the first stage and the specific time of the third stage are not fixed, and the time for maintaining the second stage and the fourth stage is 10 min. The phenomenon that when the power is reduced in a traditional feeding method, the melting rate is not reduced but increased due to heat accumulation is avoided, and it is guaranteed that the feeding purpose is achieved.

Description

technical field [0001] The invention belongs to the technical field of electroslag metallurgy, and particularly relates to a method that avoids the phenomenon that the melting rate does not drop or rises instead due to heat accumulation when the power of the traditional feeding method is reduced, and ensures a constant melting rate for feeding. Electroslag furnace automatic feeding process. Background technique [0002] As a secondary refining technology, electroslag remelting is a remelting and recasting process carried out in a copper water-cooled crystallizer with slag participating in chemical and physical reactions. In the later stage of electroslag smelting, when the metal molten pool changes from a liquid phase to a solid phase, there is about 3-6% volume shrinkage. If the shrinkage volume is not replenished by molten steel in time, electroslag ingot shrinkage cavity will be formed. Defects such as porosity and segregation caused by shrinkage cavities often cause qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B9/18
CPCC22B9/18Y02P10/25
Inventor 王文洋王晓飞黄开元翟文进张宇林志强
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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