Slag stopping crucible for high-temperature alloy smelting

Abstract

The utility model discloses a slag-stopping crucible for high-temperature alloy smelting, which relates to the technical field of metallurgical industry, and comprises a crucible body, a downwards sunken tapping notch is arranged on the tapping hole side of the crucible body, a slag-stopping plate is arranged above the tapping notch, the slag-stopping plate is fixed at the tapping notch through a detachable connecting piece, and the slag-stopping plate is fixed on the tapping notch through a detachable connecting piece. The slag baffle tightly covers the upper portion area of the tapping opening, and a channel allowing molten steel to flow out is formed between the slag baffle and the tapping opening. The device is simple in structure, convenient to operate and high in practicability, the purity of molten steel is improved, and the quality of high-temperature alloy is improved.

Description

Technical Field

[0001] This utility model belongs to the field of metallurgical industry technology, specifically relating to a slag-blocking crucible for high-temperature alloy smelting. Background Technology

[0002] High-temperature alloys, with their excellent oxidation resistance, corrosion resistance, and high-temperature mechanical properties, have become key materials for aerospace engines. During their vacuum furnace refining process, inclusions in the molten metal float and migrate to the slag-steel interface, where they are adsorbed by the slag, thus achieving purification. However, traditional crucible designs generally lack effective slag-blocking structures. As a result, when casting the molten steel after refining, slag easily flows into the casting system with the molten steel, causing some inclusions to re-mix into the molten steel, affecting its purity. At the same time, the high-temperature molten steel continuously erodes the inner wall of the crucible, exacerbating the erosion and detachment of refractory materials, forming new inclusions. These inclusions severely damage the continuity of the alloy matrix, significantly reducing the alloy's strength, toughness, plasticity, corrosion resistance, and hot working properties, thereby affecting the overall quality of the alloy. Currently, for vacuum furnaces of 25Kg, 50Kg, 100Kg, and 200Kg, it is difficult to install traditional chute slag-blocking devices due to the limited space in the furnace body. Although there are improved crucibles with added filtering devices, they are often complex in structure, have high manufacturing costs, and insufficient strength in the furnace nozzle, making them prone to damage during transportation and in high-temperature environments. Therefore, there is an urgent need for a crucible slag-blocking device that is simple in structure, easy to operate, and can effectively improve the purity of high-temperature alloy steel liquid. Utility Model Content

[0003] This invention provides a slag-blocking crucible for high-temperature alloy melting to solve the problems mentioned above.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A slag-blocking crucible for high-temperature alloy smelting includes a crucible body. The crucible body has a downwardly recessed tapping notch on the tapping side. A slag-blocking plate is provided above the tapping notch. The slag-blocking plate is fixed to the tapping notch by a detachable connector. The slag-blocking plate tightly covers the upper area of ​​the tapping notch, forming a channel for molten steel to flow out between the slag-blocking plate and the tapping notch.

[0006] Furthermore, the notch of the steel tapping opening is rectangular at the top and semi-circular at the bottom, and its size is adapted to the crucible capacity.

[0007] 25kg vacuum furnace crucible: tapping notch width 20-30mm, vertical section height 20-25mm, arc section height 5-15mm; 50kg vacuum furnace crucible: tapping notch width 30-50mm, vertical section height 25-40mm, arc section height 10-20mm; 100kg vacuum furnace crucible: tapping notch width 40-60mm, vertical section height 30-50mm, arc section height 15-25mm; 200kg vacuum furnace crucible: tapping notch width 50-70mm, vertical section height 40-60mm, arc section height 20-35mm.

[0008] Furthermore, the detachable connector is a double-ended threaded anchor; the bottom of the steel outlet notch is provided with a first connecting hole with internal threads; the slag baffle is provided with a second connecting hole; the two ends of the double-ended threaded anchor are respectively screwed into the first connecting hole and the second connecting hole.

[0009] Furthermore, the diameter of the first connecting hole and the second connecting hole is 5-10 mm, and the depth is 5-10 mm; the diameter of the double-ended threaded anchor is 5-10 mm.

[0010] Furthermore, the detachable connector and the slag baffle are made of zirconium oxide ceramic.

[0011] The beneficial effects of this utility model are:

[0012] 1. This utility model improves the purity of high-temperature alloy steel liquid by setting a slag baffle above the steel tapping opening of the crucible and utilizing the principle that the density of slag and inclusions is lower than that of molten steel.

[0013] 2. The design dimensions of this utility model can be adapted to vacuum furnace crucibles of different capacities, exhibiting good versatility and adaptability, and can meet the needs of production at different scales.

[0014] 3. This utility model uses detachable connectors to fix the slag baffle plate, so that the slag baffle plate and connectors can be replaced separately after wear or damage, without having to replace the entire crucible, which reduces maintenance costs and extends the service life of the crucible.

[0015] 4. The dimensions of the connecting holes and the detachable connectors are matched. The appropriate size design ensures the firmness and stability of the connection between the slag baffle plate and the crucible body, and improves the ease of installation of the slag baffle plate.

[0016] 5. The slag baffle plate and detachable connectors made of zirconia ceramic material ensure that the device has excellent high temperature resistance and corrosion resistance in the high temperature alloy smelting environment, thus guaranteeing the stability and reliability of the slag baffle effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] In the attached image:

[0019] 1. Crucible body; 2. Steel tapping notch; 3. Detachable connector; 4. Slag baffle. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown, this utility model discloses a slag-blocking crucible for high-temperature alloy smelting, including a crucible body 1. The crucible body 1 has a downwardly recessed steel tapping notch 2 on the steel tapping port side. A slag-blocking plate 4 is provided above the steel tapping notch 2. The slag-blocking plate 4 is fixed to the steel tapping notch 2 by a detachable connector 3. The slag-blocking plate 4 tightly covers the upper area of ​​the steel tapping notch 2, forming a channel for molten steel to flow out between the slag-blocking plate 4 and the steel tapping notch 2. The tapping notch 2 has a rectangular upper part and a semi-circular lower part. Its dimensions are adapted to the crucible capacity. Specifically: for a 25kg vacuum furnace crucible: the tapping notch width is 20-30mm, the vertical section height is 20-25mm, and the arc section height is 5-15mm; for a 50kg vacuum furnace crucible: the tapping notch width is 30-50mm, the vertical section height is 25-40mm, and the arc section height is 10-20mm; for a 100kg vacuum furnace crucible: the tapping notch width is 40-60mm, the vertical section height is 30-50mm, and the arc section height is 15-25mm; for a 200kg vacuum furnace crucible: the tapping notch width is 50-70mm, the vertical section height is 40-60mm, and the arc section height is 20-35mm.

[0022] The detachable connector 3 is a double-ended threaded anchor. The crucible body 1 has a first connecting hole with internal threads at an appropriate position in the area of ​​the steel tapping notch 2, such as at the bottom of the steel tapping notch. The slag baffle plate has a second connecting hole. The two ends of the double-ended threaded anchor are screwed into the first connecting hole and the second connecting hole respectively, thereby realizing the detachable connection between the slag baffle plate 4 and the crucible body 1. The diameter of the first connecting hole and the second connecting hole is preferably 5-10 mm, and the depth is preferably 5-10 mm. The diameter of the double-ended threaded anchor 3 is preferably 5-10 mm, and the threads at both ends of the anchor match the first connecting hole on the crucible body 1 and the second connecting hole on the slag baffle plate 4 respectively.

[0023] The materials of the double-headed threaded anchor 3 and the slag-blocking plate 4 are preferably high-temperature resistant zirconia ceramics. Zirconia ceramics have excellent high-temperature resistance, corrosion resistance, and thermal shock resistance, and can maintain structural stability and good slag-blocking effect in high-temperature alloy smelting environments.

[0024] In the specific implementation of this invention, because the density of slag and inclusions is lower than that of molten steel, they float on the surface of the molten steel during the melting process. When the crucible body 1 is tilted at the end of melting for casting, the molten steel flows out through the channel formed between the slag baffle 4 and the tapping notch 2. At this time, the slag and most of the inclusions on the surface of the molten steel are effectively blocked by the slag baffle 4 located above the channel, preventing them from entering the casting system with the molten steel. This significantly improves the purity of the molten steel and effectively avoids the adverse effects of inclusions on the properties of high-temperature alloys. Simultaneously, since both the slag baffle 4 and the double-headed threaded anchor pins 3 are detachable, they can be easily replaced when worn or damaged due to long-term use, thereby greatly reducing the overall maintenance cost of the crucible and extending its service life. This device solves the problems of low molten steel purity and high maintenance costs in existing crucibles during high-temperature alloy melting, providing a slag-blocking device with a simple structure, convenient operation, strong practicality, and the ability to effectively improve the purity of molten steel, thus possessing excellent practicality.

Claims

1. A slag-blocking crucible for high-temperature alloy melting, characterized in that: The crucible body (1) has a downwardly recessed tapping notch (2) on the tapping side. A slag baffle (4) is provided above the tapping notch (2). The slag baffle (4) is fixed to the tapping notch (2) by a detachable connector (3). The slag baffle (4) tightly covers the upper area of ​​the tapping notch (2), forming a channel for molten steel to flow out between the slag baffle (4) and the tapping notch (2).

2. The slag-blocking crucible for high-temperature alloy melting according to claim 1, characterized in that: The notch (2) for steel tapping has a rectangular shape at the top and a semi-circular shape at the bottom, and its size is adapted to the crucible capacity. 25Kg vacuum furnace crucible: the width of the steel tapping notch (2) is 20-30mm, the height of the vertical section is 20-25mm, and the height of the arc section is 5-15mm; 50Kg vacuum furnace crucible: the width of the steel tapping notch (2) is 30-50mm, the height of the vertical section is 25-40mm, and the height of the arc section is 10-20mm; 100Kg vacuum furnace crucible: The width of the steel tapping notch (2) is 40-60mm, the height of the vertical section is 30-50mm, and the height of the arc section is 15-25mm; 200Kg vacuum furnace crucible: The width of the steel tapping notch (2) is 50-70mm, the height of the vertical section is 40-60mm, and the height of the arc section is 20-35mm.

3. The slag-blocking crucible for high-temperature alloy melting according to claim 1, characterized in that: The detachable connector (3) is a double-headed threaded anchor; the bottom of the steel outlet notch (2) is provided with a first connecting hole with internal threads; the slag baffle (4) is provided with a second connecting hole; the two ends of the double-headed threaded anchor are screwed into the first connecting hole and the second connecting hole respectively.

4. The slag-blocking crucible for high-temperature alloy melting according to claim 3, characterized in that: The diameter of the first connecting hole and the second connecting hole is 5-10 mm, and the depth is 5-10 mm; the diameter of the double-ended threaded anchor is 5-10 mm.

5. The slag-blocking crucible for high-temperature alloy melting according to claim 1, characterized in that: The detachable connector (3) and the slag baffle (4) are made of zirconium oxide ceramic.

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