Combined ingot protection plate device for electroslag remelting

Abstract

The utility model relates to a kind of combined ingot protection plate device for electroslag remelting, which can guarantee ingot tail quality and avoid post-cutting, comprising an ingot protection plate inner plate, an ingot protection plate outer ring outside the ingot protection plate inner plate, the ingot protection plate outer ring is sleeved on the ingot protection plate inner plate, the ingot protection plate inner plate is shaped as a circular truncated cone with the same diameter from top to bottom, and the diameter is the same as the inner diameter of the crystallizer; the ingot protection plate outer ring is a concentric circular ring platform with the same thickness as the ingot protection plate inner plate, and the outer diameter of the ingot protection plate outer ring is larger than the outer flange diameter of the crystallizer; an asbestos rope is placed on the contact gap between the ingot protection plate outer ring and the ingot protection plate inner plate.

Description

Technical Field

[0001] This utility model belongs to the field of iron and steel metallurgy technology, and specifically relates to a combined ingot protection plate device for electroslag remelting that can both ensure the quality of the ingot tail and avoid subsequent cutting. Background Technology

[0002] During electroslag remelting, many manufacturers place a circular protective plate on the bottom copper plate. This serves two purposes: firstly, to prevent the bottom water tank from being punctured by the electric arc or to prevent damage to the bottom copper plate; and secondly, to avoid long-term contact between the high-temperature slag and molten steel and the bottom copper plate, which would corrode its surface.

[0003] Traditional ingot retainer plates are divided into two categories: one type has a diameter larger than the outer diameter of the crystallizer, called an outer ingot retainer plate. This type utilizes the weight of the crystallizer itself to press down on the retainer plate, preventing deformation or drift caused by electromagnetic fields. However, after demolding, excess retainer plates around the electroslag ingot need to be removed using cutting equipment. This has three disadvantages: first, the cutting is carried out under high-temperature conditions, resulting in high labor intensity for workers; second, the cutting takes 0.5-1 hour, reducing production efficiency, and the prolonged air cooling of the electroslag ingot poses significant quality risks; third, the cut-off retainer plates can only be recycled as scrap, and the cutting process consumes large amounts of oxygen and acetylene, increasing production costs.

[0004] Another type of ingot retainer plate has a diameter smaller than the inner diameter of the crystallizer, and is called an inner ingot retainer plate. The inner ingot retainer plate solves the problems of high labor intensity, low production efficiency, prolonged air cooling after mold removal, and increased costs associated with cutting ingot retainer plates. However, during the initial remelting stage, due to electromagnetic stirring, the retainer plate may drift or float, causing slag to seep between the bottom of the electroslag ingot and the retainer plate, affecting conductivity. This can lead to minor issues such as slag inclusions and cracks at the ingot's tail end, affecting the ingot's forging utilization rate. In severe cases, it can damage the bottom water tank or even directly cut off the power, stopping smelting and resulting in scrap on-site, posing a significant quality hazard. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of the existing technology by providing a combined ingot protection plate device for electroslag remelting that optimizes and improves the two existing ingot protection plates, which can both ensure the internal quality of the ingot tail and avoid subsequent cutting.

[0006] The technical solution of this utility model is implemented as follows: A composite ingot retainer plate for electroslag remelting includes an inner ingot retainer plate and an outer ingot retainer plate ring located outside the inner ingot retainer plate. The outer ingot retainer plate ring is fitted onto the inner ingot retainer plate. The inner ingot retainer plate is shaped like a truncated cone with the same upper and lower diameters, and its diameter is the same as the inner diameter of the crystallizer. The outer ingot retainer plate ring is a concentric truncated cone with the same thickness as the inner ingot retainer plate. The outer diameter of the outer ingot retainer plate ring is larger than the outer flange diameter of the crystallizer. An asbestos rope is placed in the contact gap between the outer ingot retainer plate ring and the inner ingot retainer plate.

[0007] The inner plate and outer ring of the spindle guard are made of carbon steel.

[0008] The positive effects of this utility model's technical solution are as follows: Compared with traditional ingot protection plates, this utility model has the following advantages: 1. Traditional outer ingot plates must have a diameter larger than the outer flange diameter of the crystallizer. During use, the ingot plate is placed first, followed by the crystallizer, using the crystallizer's own weight to press down on the ingot plate for fixation. After demolding the electroslag ingot, excess ingot plate around the ingot needs to be removed using cutting equipment. This cutting process operates under high-temperature conditions, resulting in a harsh working environment and high labor intensity. The cut scraps can only be recycled as scrap steel, increasing production costs. Furthermore, the high-temperature electroslag ingot is exposed to the atmosphere during the ingot plate cutting process, posing certain quality risks. This new combined ingot plate device eliminates the ingot plate cutting process. After demolding, the electroslag ingot can be directly annealed or hot-transferred, reducing the time the ingot is exposed to the atmosphere, lowering labor intensity and quality risks, and improving production efficiency.

[0009] 2. Traditional inner ingot protectors, due to the lack of fixed steel plates, can drift or float, causing slag to seep between the bottom of the electroslag ingot and the protector plate, affecting conductivity. This can lead to minor issues like slag inclusions and cracks at the ingot's tail end, impacting ingot utilization. In severe cases, it can damage the bottom water tank equipment or even cause a power outage, halting smelting and resulting in scrap. The inner plate of this invention is fixed in the middle by the outer ring of the outer protector plate, preventing it from floating or sliding under the force of molten slag or metal, effectively solving the problems associated with traditional inner ingot protectors.

[0010] 3. The combined ingot guard plate for electroslag remelting has an outer ring that is not in contact with molten slag or molten metal, so it will not deform or erode during the production process, can be reused multiple times, and has good economic efficiency.

[0011] 4. The combined ingot retainer plate for electroslag remelting has an outer ring that is an integral circular ring. The contact end face of the outer ring of the ingot retainer plate is perpendicular to the working surface with the inner plate of the ingot retainer plate. The outer ring of the ingot retainer plate is easier and more efficient to cut during production, and it is more convenient to assemble during electroslag production. The materials of the inner plate and the outer ring of the ingot retainer plate are common and relatively inexpensive. Attached Figure Description

[0012] Figure 1 This is a front view of the combined ingot guard structure of this utility model.

[0013] Figure 2 This is a top view of the combined spindle guard structure of this utility model.

[0014] Figure 3 This is a rendering of the electroslag ingot after molding according to this utility model. Detailed Implementation

[0015] Example 1: A combined ingot retainer plate for electroslag remelting includes an inner ingot retainer plate 2 and an outer ingot retainer plate ring 1 located outside the inner ingot retainer plate. The outer ingot retainer plate ring 1 is fitted onto the inner ingot retainer plate 2. The inner ingot retainer plate 2 is shaped like a frustum with the same upper and lower diameters, and its diameter is the same as the inner diameter of the crystallizer. The outer ingot retainer plate ring 1 is a concentric ring with the same thickness as the inner ingot retainer plate 2, and the outer diameter of the outer ingot retainer plate ring 1 is larger than the outer flange diameter of the crystallizer. An asbestos rope is placed in the contact gap between the outer ingot retainer plate ring 1 and the inner ingot retainer plate 2.

[0016] The inner plate 2 and the outer ring 1 of the spindle guard plate are made of carbon steel.

[0017] The inner plate 2 of the retaining plate is shaped like a frustum with the same upper and lower diameters, and its diameter is the same as or slightly smaller than the inner diameter of the crystallizer. The outer ring 1 of the retaining plate is a concentric ring with the same thickness as the inner plate 2, and its outer diameter is larger than the outer flange diameter of the crystallizer. There are no specific requirements for the materials of the inner plate 2 and the outer ring 1; they can generally be made of inexpensive metals with good electrical conductivity, such as carbon steel. Before use, the oxide scale on the upper and lower surfaces must be polished or ground to reveal a metallic luster.

[0018] Example 1: The following example uses an electroslag crystallizer with a Ф725 / 790mm specification for further explanation.

[0019] like Figure 1 , 2 As shown in Figures 1 and 3, a combined ingot protection plate device for electroslag remelting is provided. The inner diameter of the ingot protection plate 2 is 790 mm, and the inner and outer diameters of the outer ring 1 of the ingot protection plate are 795 mm and 1000 mm, respectively.

[0020] The thickness of the inner plate 2 and the outer ring 1 of the spindle guard plate is 16mm.

[0021] During electroslag remelting preparation, the inner plate 2 of the ingot retainer is first placed flat in the center of the bottom water tank. Then, the outer ring 1 of the ingot retainer is placed on the outside of the inner plate 2. The arc-initiating agent is placed in the center of the inner plate 2. Next, the crystallizer is placed on the outer ring 1 of the ingot retainer. The weight of the crystallizer presses down on the outer ring 1, fixing the inner plate 2 in place and preventing it from moving left or right. The gap between the two is filled with asbestos rope to prevent slag or steel leakage during the initial stage of remelting. During electroslag remelting, since the inner plate 2 of the ingot retainer does not contact the crystallizer, even if it deforms due to heat, it will not cause the crystallizer to shake or tilt, thus avoiding slag or steel leakage accidents.

[0022] After the electroslag remelting mold is cooled, the crystallizer is lifted away first, and then the electroslag ingot and the inner plate 2 of the sticky ingot protection plate are lifted away directly using a special clamp. The outer ring 1 of the ingot protection plate is reused after it falls off.

[0023] The following table compares the effects of conventional integral ingot guard plates with those of this utility model in the electroslag production of Ф725 / 790mm crystallizers.

[0024] The comparison results are shown in the table below. 1 Material 122kg 76kg Each furnace requires 46 kg of ingot protection plates, reducing costs by 160 yuan. 2 Cutting labor cost 20 yuan per ton of steel 0 yuan Cost reduction of 20 yuan per ton of steel 3 Cutting energy consumption 5 yuan per ton of steel 0 yuan Cost reduction of 5 yuan per ton of steel 4 Cutting time 0.5-1.0h 0h Overall efficiency improved by 3.8%-7.6%. .

Claims

1. A combined ingot guard plate for electroslag remelting, comprising an ingot guard plate inner plate and an ingot guard plate outer ring located outside the ingot guard plate inner plate, characterized in that: The outer ring of the spindle guard plate is fitted onto the inner plate of the spindle guard plate. The inner plate of the spindle guard plate is shaped like a frustum with the same diameter at the top and bottom, and its diameter is the same as the inner diameter of the crystallizer. The outer ring of the spindle guard plate is a concentric ring with the same thickness as the inner plate of the spindle guard plate, and the outer diameter of the outer ring of the spindle guard plate is larger than the outer flange diameter of the crystallizer. An asbestos rope is placed in the contact gap between the outer ring of the spindle guard plate and the inner plate of the spindle guard plate.

2. The combined ingot support plate for electroslag remelting as described in claim 1, characterized in that: The inner plate and outer ring of the spindle guard are made of carbon steel.

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