Hundred-ton large-scale three-phase electroslag furnace feeding technique

A three-phase electric and large-scale technology, applied in the field of shrinkage technology, can solve the problems of reduced material utilization rate, poor surface quality of electroslag ingots, low yield and utilization rate of steel ingots, etc., to improve the yield and utilization rate of steel ingots, and ensure Effect of improving crystal structure and utilization rate

A three-phase electric and large-scale technology, applied in the field of shrinkage technology, can solve the problems of reduced material utilization rate, poor surface quality of electroslag ingots, low yield and utilization rate of steel ingots, etc., to improve the yield and utilization rate of steel ingots, and ensure Effect of improving crystal structure and utilization rate

CN102978413AActive Publication Date: 2013-03-20烟台台海玛努尔核电设备有限公司
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Embodiment Construction

[0017] Below in conjunction with embodiment, the present invention is further described.

[0018] The invention adopts the small-diameter electrode for feeding, and controls the melting speed regularly through the continuous feeding process of adjusting the polar center circle and gradually reducing the power.

[0019] The specific implementation is as follows:

[0020] Electrode size: The size of the feeding electrode used in the large three-phase electroslag furnace of the present invention is about 65-75% of the diameter of the electroslag remelting electrode, wherein the diameter of the remelting electrode is about 0.25-0.30 times the diameter of the crystallizer.

[0021] Input power: The effective input power used in the feeding process is about 40~55% of normal remelting to ensure that the feeding electrode is in a slow melting state, and the melting rate is generally about 0.3~0.8t / h.

[0022] Electrode burial depth: During the feeding process, the burial depth should...

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Abstract

The invention relates to a hundred-ton large-scale three-phase electroslag furnace feeding technique. In the feeding process, a feeding electrode of which the diameter is 65-75% of the normal remelting electrode is adopted, and the electrode center circle and input power are adjusted to gradually reduce the depth and diameter of the bath, thereby implementing favorable feeding of hundred-ton steel ingots. In the feeding process, the effective input power is 40-55% of normal remelting, the melting speed is controlled at 0.3-0.8 t / h, and the buried depth is controlled at 10-20mm; in the early feeding stage, the diameter of the electrode center circle is one half of the crystallizer; and in the later feeding stage, the diameter of the electrode center circle is adjusted to 25-30% of the crystallizer. The feeding technique provided by the invention can control the shrinkage cavity depth of the hundred-ton electroslag ingot with the diameter of 1800mm at 100-240mm or so, whereas the shrinkage cavity depth of the existing feeding technique is 600mm or so, thereby enhancing the utilization ratio of the steel ingot.

Description

technical field [0001] The invention relates to a feeding process in the remelting and smelting process of a large-scale three-phase electroslag furnace (hundred tons). Background technique [0002] The diameter of the hundred-ton electroslag ingot exceeds 1800mm. If the feeding is not good, it is easy to cause shrinkage at the top, which will affect the utilization rate of the steel ingot. [0003] There are generally two ways of electroslag remelting feeding: continuous feeding and intermittent feeding. The main method of continuous feeding is to reduce the current, reduce the depth of the molten pool, and relatively increase the solidification speed. Since the liquid metal is continuously filled, the purpose of feeding is achieved. The main method of intermittent feeding is to implement at the end of smelting: power failure→interval for a period of time→power on→re-power outage→interval for a certain period of time→re-power→re-power outage. Smaller, for large cross-sect...

Claims

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Application Information

Patent Timeline
20 Mar 2013
Publication
CN102978413A
IPC
C22B9/187; B22D23/10
Inventors
刘仲礼; 姜科