CN217617718U

CN217617718U - Continuous casting tundish stopper rod for steelmaking

Info

Publication number: CN217617718U
Application number: CN202221750115.9U
Authority: CN
Inventors: 王小军; 朱国本; 左敬春; 李茂峰; 邬美强; 谌智勇; 朱克强; 张宝荣; 宋吉鑫
Original assignee: Qingdao Zhengwang Material Co ltd
Current assignee: Qingdao Zhengwang Material Co ltd
Priority date: 2022-07-06
Filing date: 2022-07-06
Publication date: 2022-10-21
Anticipated expiration: 2032-07-06

Abstract

The utility model discloses a package stopper rod in middle of steelmaking is with continuous casting, its stick head and stick pole that includes a body coupling, wherein the stick head is semicircle type bilayer structure, the first aluminium carbon layer of the tombarthite carbon layer of aluminic acid and inlayer including the inlayer. The utility model provides a ladle stopper stick in middle of steelmaking is with continuous casting can avoid the stopper stick out of control among the steelmaking process.

Description

Continuous casting tundish stopper rod for steelmaking

Technical Field

The utility model belongs to the technical field of metallurgical refractory material, concretely relates to package stopper stick in middle of continuous casting is used in steelmaking.

Background

The smelting of the rare earth steel is beneficial to improving the quality level of steel materials, and reaches or exceeds the product quality level of foreign advanced enterprises. With the continuous and intensive research, researchers find that the addition of rare earth into steel has various beneficial effects, including purification, modification, microalloying, hydrogen capture and the like, and the rare earth can improve the structure, and improve the tensile strength, wear resistance, drawing property and fatigue resistance of steel. However, the production of rare earth has a plurality of bottleneck problems, and under the high-temperature state of continuous casting, the Rare Earth (RE) in molten steel is very active and can react with magnesium, high-alumina and silicate refractory materials as follows:

4RE+3SiO ₂ ＝2RE ₂ O ₃ +3Si

2RE+Al ₂ O ₃ ＝RE ₂ O ₃ +2Al

2RE+3MgO＝RE ₂ O ₃ +3Mg

further leading to the plug rod out of control, the nozzle blockage and in severe cases to the pouring interruption or production accident. The above reactions occur in the covering agent, dry material, crystallizer casting powder and the like in the tundish, and the quality of the inner part and the outer part of the casting blank is widely influenced.

The technology of applying rare earth oxide to improve refractory materials in the field of refractory materials is still in the exploration stage, at present, rare earth oxide is usually added into basic refractory materials such as magnesium refractory materials, magnesium spinel refractory materials and the like to reduce the apparent porosity of the refractory materials, improve the compactness, high-temperature breaking strength, thermal shock resistance and the like of the refractory materials, but the refractory materials still have the phenomena of water gap blockage and plug rod runaway.

SUMMERY OF THE UTILITY MODEL

To one or more problems that exist among the prior art, the utility model provides a package stopper stick in middle of continuous casting is used in steelmaking, its stick head and stick pole that includes an organic whole connection, wherein:

the rod head is of a semicircular double-layer structure and comprises an inner layer and an outer layer, the outer layer is an aluminate rare earth carbon layer, and the inner layer is a first aluminum carbon layer;

the rod is of a rod type single-layer structure, a second aluminum carbon layer is formed, a tail hole is formed in the tail portion of the rod, and internal threads are arranged in the tail hole.

In some embodiments, a nut is embedded in the tail hole, and the nut is provided with the internal thread.

In some embodiments, the outer diameter of the rod is 120-160mm.

In some embodiments, the wand is a hollow structure.

In some embodiments, the continuous casting tundish stopper for steelmaking has a length of 1200 to 1800mm.

The utility model provides a package stopper rod in middle of steelmaking is with continuous casting includes stick head and stick pole of a body coupling, wherein the stick head is semicircle type bilayer structure, the aluminate rare earth carbon layer including the inlayer and the first aluminium carbon layer of inlayer. When the continuous casting tundish stopper rod is used for steelmaking, the outer layer of the aluminate rare earth carbon layer of the rod head in contact with molten steel can effectively avoid the reaction of rare earth in the molten steel with magnesium, high-alumina, silicate refractory materials and the like, and further can effectively avoid the phenomenon of out-of-control of the stopper rod in the production process of the rare earth steel.

Drawings

Fig. 1 is a schematic structural view of a continuous casting tundish stopper for steelmaking provided by the utility model.

Detailed Description

The present invention will be described in detail with reference to specific examples, which are provided to facilitate understanding of the present invention and are not intended to limit the present invention.

Example 1: continuous casting tundish stopper rod for steelmaking

As shown in fig. 1, a schematic structural diagram of a continuous casting tundish stopper for steelmaking according to this embodiment is shown, the continuous casting tundish stopper is of a rod-shaped structure, the length of the continuous casting tundish stopper may be 1200-1800mm, and the continuous casting tundish stopper comprises a rod head 20 and a rod 21 which are integrally connected, wherein the rod head 20 is of a semicircular double-layer structure and comprises a rare earth aluminate carbon layer 22 at an outer layer and a first aluminum carbon layer 23 at an inner layer, the rod 21 is of a rod-shaped single-layer structure and is formed into a second aluminum carbon layer 24, the rod 21 may be designed such that a protrusion 26 is provided on an outer surface of the rod 21, the outer diameter of the rod may be 120-160mm, and may also be designed as a hollow or solid structure, a tail hole 25 is provided at a tail portion of the rod 21, a nut is embedded therein or an internal thread is directly provided in the tail hole 25, and a connecting rod provided with an external thread matching the nut or the internal thread in the tail hole 25 may be screwed in the connecting rod.

Example 2: preparation of continuous casting tundish stopper rod for steelmaking

(1) Preparation of rare earth raw material for producing continuous casting tundish stopper rod for steelmaking

1.1 Uniformly mixing rare earth powder (which can be rare earth cerium powder, rare earth lanthanum powder, rare earth neodymium powder, rare earth yttrium powder or a mixture thereof) with the purity of more than or equal to 99.0 percent (the granularity is less than 325 meshes) and aluminum powder with the purity of more than or equal to 99.0 percent (the granularity is less than 325 meshes) according to the molar ratio of the rare earth to the Al (0.5-3) to 1 to obtain an intermediate;

1.2 Loading the intermediate obtained in the step 1) into a shuttle kiln, heating to 1500-1700 ℃, keeping for 3.5-4.5 hours, firing to obtain a composite oxide of rare earth and aluminum, cooling along with the kiln, crushing, screening and grinding, and selecting composite oxide powder with the granularity of less than 0.5mm as a rare earth raw material for producing a continuous casting tundish stopper rod for steelmaking.

(2) Preparation of continuous casting tundish stopper composite pug for steelmaking

The method for producing the continuous casting tundish stopper rod composite pug for steelmaking by using the rare earth raw material prepared in the step (1) comprises the working procedures of batching and granulating, and specifically comprises the following steps:

2.1 Putting the rare earth raw material (the addition amount is 90 percent of the total weight of the refractory pug) prepared in the step (1) into a granulator, adding crystalline flake graphite (purchased from Qingdao Mingsheng, the addition amount is 4 percent of the total weight of the refractory pug), boron carbide (purchased from peony Jiang boron carbide Co., ltd, the addition amount is 1 percent of the total weight of the refractory pug) and phenolic resin (the addition amount is 5 percent of the total weight of the refractory pug) as a bonding agent, and mixing for 15-30 minutes to prepare the composite pug.

(3) Preparation of continuous casting tundish stopper rod for steelmaking

The method for preparing the stopper rod of the continuous casting tundish by using the composite pug obtained in the step (2) comprises the following steps: filling a mold → isostatic pressing → curing → sintering → processing → glazing → flaw detection → packaging, which specifically comprises the following operations:

3.1 According to the schematic structural diagram of the continuous casting tundish stopper shown in fig. 1, the composite pug obtained in step (2), the bulk aluminum carbon layer pug (pug made of brown corundum and crystalline flake graphite), and the slag line zirconium carbon layer pug (pug made of zirconia and crystalline flake graphite) are filled into a mold, and then the qualified continuous casting tundish stopper is finally obtained through the processes of molding, curing (drying the pug for 5-7 hours at a temperature of 100-120 ℃), firing (keeping the temperature of the cured pug for 2-4 hours at a temperature of 1500-1700 ℃), processing, glazing, X-ray flaw detection and the like.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A continuous casting tundish stopper rod for steelmaking, characterized by comprising a rod head (20) and a rod (21) which are integrally connected, wherein:

the rod head (20) is of a semicircular double-layer structure and comprises an inner layer and an outer layer, the outer layer is a rare earth aluminate carbon layer (22), and the inner layer is a first aluminum carbon layer (23);

the rod (21) is of a rod-shaped single-layer structure, the rod is formed into a second aluminum carbon layer (24), a tail hole (25) is formed in the tail portion of the rod (21), and internal threads are arranged in the tail hole (25).

2. The continuous casting tundish stopper rod for steelmaking according to claim 1, wherein a nut is embedded in the tail hole (25), and the nut is provided with the internal thread.

3. The continuous casting tundish stopper rod for steelmaking according to claim 1, wherein the rod (21) has an outer diameter of 120 to 160mm.

4. The continuous casting tundish stopper rod for steelmaking according to claim 1, wherein the rod (21) has a hollow structure.

5. The continuous casting tundish stopper rod for steelmaking according to claim 1, wherein the length of the continuous casting tundish stopper rod for steelmaking is 1200-1800mm.