Erosion-resistant anti-scouring stopper rod

Abstract

The utility model relates to an erosion-resistant and scouring-resistant stopper rod, and belongs to the technical field of refractory materials for continuous casting in the metallurgical industry. According to the technical scheme, the stopper rod comprises a stopper rod sleeve (1), a stopper rod body (2) and a stopper rod head (3), the upper portion and the lower portion of the stopper rod body (2) are cylinders with the same diameter, the middle of the stopper rod body (2) is in a big-end-up circular truncated cone shape, and the cylinder on the upper portion of the stopper rod body (2) and the circular truncated cone shape in the middle of the stopper rod body (2) form a fixing boss (6) matched with the stopper rod sleeve (1). The stopper rod sleeve (1) is sleeved on the upper portion of the stopper rod body (2), the center of the stopper rod body (2) is provided with a ventilation channel (5) penetrating through the stopper rod body (2), and the lower end of the stopper rod body (2) is provided with a stopper rod head (3) integrated with the stopper rod body (2). The utility model has the beneficial effects that the utility model relates to an anti-erosion and anti-scouring stopper rod, and belongs to the technical field of refractory materials for continuous casting in the metallurgical industry.

Description

Technical Field

[0001] The utility model relates to a corrosion-resistant and scour-resistant stopper rod, belonging to the technical field of refractory materials for continuous casting in the metallurgical industry. Background Art

[0002] The stopper rod is one of the three major parts of steelmaking continuous casting. It is a key functional refractory material for continuous casting. It maintains the flow of molten steel by controlling the distance between the rod head and the nozzle bowl. The stopper rod cannot be replaced during use like the submerged nozzle and long nozzle, so the service life of the tundish depends on the service life of the stopper rod.

[0003] At present, the stopper rod is mainly made of aluminum carbon and contains a certain amount of molten quartz. The stopper rod is located in the tundish molten pool area. The molten steel in this area is relatively active. During the use of the stopper rod, it will be physically washed and chemically eroded by the molten steel. The inclusions in the molten steel and the alumina of the stopper rod form a low-melting-point substance that is washed by the molten steel. At the same time, the covering agent in the tundish and the inclusions floating on the surface of the molten steel combine and aggregate at the slag line of the stopper rod to form a "crusting" phenomenon, which leads to abnormal erosion of the slag line of the stopper rod, and it is very easy for the stopper rod to break, which seriously affects the life of the tundish and the safety of use; in addition, due to the poor overall stability of the stopper rod, it is easy to fall off during baking and use.

[0004] In order to increase the service life of the stopper rod and the overall stability of the stopper rod, avoid the phenomenon of falling off and breakage of the stopper rod during baking and use, and reduce the cost of refractory materials in the tundish and smelting per ton of steel, a corrosion-resistant and erosion-resistant stopper rod is specially developed. Utility Model Content

[0005] The purpose of the utility model is to provide a corrosion-resistant and scour-resistant stopper rod, which can improve the corrosion resistance and scour resistance of the stopper rod slag line, avoid falling off and stopper rod breakage during baking and use, achieve synchronization with the life of the ladle, reduce the cost of refractory materials in the ladle and smelting a ton of steel, and solve the problems existing in the background technology.

[0006] The technical solution of the utility model is:

[0007] A corrosion-resistant and scour-resistant stopper rod comprises a stopper rod sleeve, a stopper rod body and a stopper rod head. The upper and lower parts of the stopper rod body are cylindrical with the same diameter, and the middle part of the stopper rod body is a truncated cone with a larger upper part and a smaller lower part. The cylindrical shape of the upper part of the stopper rod body and the truncated cone shape in the middle part of the stopper rod body constitute a fixed boss matched with the stopper rod sleeve. The stopper rod sleeve is sleeved on the upper part of the stopper rod body. A ventilation channel penetrating the stopper rod body is provided in the center of the stopper rod body. The lower end of the stopper rod body is a stopper rod head which is an integral structure with the stopper rod body.

[0008] The inner diameter of the stopper rod sleeve matches the cylindrical diameter of the upper and lower parts of the stopper rod body.

[0009] The outer diameter of the stopper rod sleeve is the same as the maximum diameter of the truncated cone in the middle of the stopper rod body.

[0010] Fire clay is filled between the stopper rod sleeve and the stopper rod body.

[0011] A steel nut is provided at the upper end of the air permeable passage in the center of the stopper rod body, and the steel nut is used for fixing and installing the stopper rod when it is in use.

[0012] The above-mentioned corrosion-resistant and erosion-resistant stopper rod has an alumina content of more than 60% in the stopper rod body, and the stopper rod sleeve is made of aluminum-zirconium-carbon material, and the zirconium oxide content is controlled to be more than 60%.

[0013] The beneficial effects of the utility model are:

[0014] (1) It can improve the corrosion resistance and erosion resistance of the stopper rod;

[0015] (2) Improve the overall stability of the stopper rod, making it less likely to fall off during baking and use;

[0016] (3) Improve the durability of the stopper rod, prolong its service life, synchronize its service life with the tundish, and reduce production costs;

[0017] (4) The stopper rod is relatively simple to produce, easy to control, convenient to use, and can be mass-produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of the utility model;

[0019] Figure 2 It is a cross-sectional view of the utility model;

[0020] Figure 3 is a cross-sectional view of the stopper rod body;

[0021] Figure 4 This is the front view of the stopper rod sleeve;

[0022] Figure 5 It is a top view of the stopper rod sleeve;

[0023] In the figure: a stopper rod sleeve 1, a stopper rod body 2, a stopper rod head 3, a steel nut 4, a vent channel 5, and a fixing boss 6. DETAILED DESCRIPTION

[0024] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0025] See attached Figure 1-5A corrosion-resistant and scour-resistant stopper rod comprises a stopper rod sleeve 1, a stopper rod body 2 and a stopper rod head 3. The upper and lower parts of the stopper rod body 2 are cylindrical with the same diameter, and the middle part of the stopper rod body 2 is a truncated cone with a larger upper part and a smaller lower part. The cylindrical shape of the upper part of the stopper rod body 2 and the truncated cone shape in the middle of the stopper rod body 2 constitute a fixed boss 6 matched with the stopper rod sleeve 1. The stopper rod sleeve 1 is sleeved on the upper part of the stopper rod body 2. The center of the stopper rod body 2 is provided with a gas permeable channel 5 that passes through the stopper rod body 2. The lower end of the stopper rod body 2 is a stopper rod head 3 that is an integral structure with the stopper rod body 2.

[0026] In this embodiment, the inner diameter of the stopper rod sleeve 1 matches the cylindrical diameters of the upper and lower parts of the stopper rod body 2 , and the outer diameter of the stopper rod sleeve 1 is the same as the maximum diameter of the truncated cone in the middle of the stopper rod body 2 .

[0027] The alumina content of the stopper rod body 2 is controlled to be above 60%, which can improve the corrosion resistance of the stopper rod slag line. The stopper rod sleeve 1 is made of aluminum zirconium carbon with a thickness of 20 mm, in which the zirconium oxide content is controlled to be above 60%.

[0028] The specific production process is as follows:

[0029] After the prepared raw materials are statically pressed, the stopper rod sleeve 1 and the stopper rod body are obtained respectively;

[0030] Clean the inner cavity of the stopper rod sleeve 1 and apply fire clay to fill it fully;

[0031] Slowly insert the stopper rod sleeve 1 along the stopper rod body 2 from top to bottom. When the bottom end of the stopper rod sleeve 1 is inserted into the position of the stopper rod body fixed boss 6, squeeze the stopper rod sleeve 1 to fill the gap between the fire mud and the fixed boss 6.

[0032] (4) After the stopper rod sleeve 1 and the stopper rod body 2 are firmly matched, the gaps between the upper and lower ends of the stopper rod sleeve 1 and the outer part of the stopper rod body 2 are evenly coated with fire clay;

[0033] (5) The assembled stopper rod is dried at 200°C and then vacuum fired to obtain a finished stopper rod.

Claims

1. A corrosion-resistant and scour-resistant stopper rod, characterized in that: The invention comprises a stopper rod sleeve (1), a stopper rod body (2) and a stopper rod head (3); the upper and lower parts of the stopper rod body (2) are cylindrical with the same diameter; the middle part of the stopper rod body (2) is a truncated cone with a larger upper part and a smaller lower part; the cylindrical shape of the upper part of the stopper rod body (2) and the truncated cone shape in the middle part of the stopper rod body (2) constitute a fixed boss (6) matched with the stopper rod sleeve (1); the stopper rod sleeve (1) is sleeved on the upper part of the stopper rod body (2); the center of the stopper rod body (2) is provided with a venting passage (5) penetrating the stopper rod body (2); the lower end of the stopper rod body (2) is a stopper rod head (3) which is an integral structure with the stopper rod body (2).

2. The corrosion-resistant and scour-resistant stopper rod according to claim 1, characterized in that: The inner diameter of the stopper rod sleeve (1) matches the cylindrical diameters of the upper and lower parts of the stopper rod body (2).

3. The corrosion-resistant and scour-resistant stopper rod according to claim 2, characterized in that: The outer diameter of the stopper rod sleeve (1) is the same as the maximum diameter of the truncated cone in the middle of the stopper rod body (2).

4. The corrosion-resistant and scour-resistant stopper rod according to claim 1 or 2, characterized in that: Fire clay is filled between the stopper rod sleeve (1) and the stopper rod body (2).

5. The corrosion-resistant and scour-resistant stopper rod according to claim 1, characterized in that: A steel nut (4) is provided at the upper end of the air permeable passage (5) in the center of the stopper rod body (2). The steel nut (4) is used for fixing and installing the stopper rod when in use.

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