CN217252783U

CN217252783U - Composite impact plate for tundish

Info

Publication number: CN217252783U
Application number: CN202123368173.3U
Authority: CN
Inventors: 田守信; 张继国; 申娟娟
Original assignee: YANGGU XINMIN REFRACTORY MATERIALS CO Ltd; SHANDONG KEXIN NEW MATERIALS CO Ltd
Current assignee: YANGGU XINMIN REFRACTORY MATERIALS CO Ltd; SHANDONG KEXIN NEW MATERIALS CO Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-08-23
Anticipated expiration: 2031-12-29

Abstract

The application discloses middle package is with compound impingement plate coats the thermal-insulated dielectric clay of one deck in induction coil clearance and internal surface, inwards is the heat preservation, inwards again is the working layer of being made by the ramming material. The thickness of the heat-insulating dielectric cement is within 5 mm. The thickness of the heat insulation layer is within one third of the whole thickness. The heat insulation brick is built by adopting an embedded structure, and comprises a nano plate, a nano-micron pore material and a high-temperature anti-seepage coating coated on the inner surface from outside to inside in sequence. This will further prevent steel penetration. The safety is further improved. The structure reduces the heat dissipation of the induction furnace by more than 60%. Plays an important role in saving electricity, reducing cost and protecting environment.

Description

Composite impact plate for tundish

Technical Field

The application belongs to the technical field of refractory materials for steel smelting, and particularly relates to a composite impact plate for a tundish.

Background

From the steel ladle to the tundish, the flow velocity of the molten steel is very large, and the impact force on the steel falling point of the tundish is very large. This results in the impingement zone eroding very quickly and failing to meet the time requirements for pouring the steel from the tundish. Significantly limiting the service life of the tundish. The continuous casting production cost is obviously influenced.

At present, the tundish impact plate is mainly a precast block formed by casting. The materials for the prefabricated block mainly comprise Al2O3 and MgO. Their service life is namely around 20 hours. If the refractory material is required to be used for more than 50 hours, the refractory material needs to be thickened or a plurality of impact plates are stacked for use, even the thickness reaches more than 500mm, so that the cost is obviously increased and the unit consumption of the refractory material is increased. There are also impact plates of magnesium carbon or aluminium magnesium carbon using organic pressing. Because the area of the impact plate is very large, the sizes are 300 multiplied by 300, 400 multiplied by 400, 500 multiplied by 500 and 550 multiplied by 550, the forming pressure of a common press is insufficient, and the impact plate has insufficient density, high porosity and low impact strength due to low forming pressure, so that the erosion is fast, and the service life of the impact plate is even shorter than that of the impact plate made of pouring materials. And difficulty is brought to the improvement of the service life of the tundish and the improvement of the safety. This is the current situation.

Patent 201921417814.X is a long-life tundish composite impact plate. The casting molding prefabricated part and the mechanical pressing molded part are combined, and the mechanical pressing circular truncated cone-shaped impact plate is located in the center, so that the impact resistance to molten steel is improved. This significantly improves the service life, but is inconvenient in baking, and easily causes cracking and oxidation.

Patent 201811192144.6 discloses a method for producing tundish impact plate by combining a stopper rod turning material with a waste slide plate. The regeneration of the used refractory material proves cost reduction, efficiency improvement and environment improvement, and has better social benefit. However, since the used refractory has pseudo particles, slag and ash, the erosion and washing resistance is not good. At present, under the condition of taking the service life improvement as a main target, the method cannot meet the requirement of the service life.

There are also some reports of composite fired impingement plates used in tundish impingement plates. It has high hot strength and high flushing resistance. But its thermal shock resistance is greatly reduced and the accident rate of explosion is increased. Thus adversely affecting the stability of the continuous casting. Meanwhile, the cost of the product is also improved, the energy consumption of the manufactured product is increased, and the modern energy-saving and environment-friendly requirements are not met.

Disclosure of Invention

In order to improve the erosion resistance and the scouring resistance of the impact plate, the service life of the impact plate is prolonged. Overcomes the phenomenon of insufficient pressure of the existing forming equipment, and the tundish impact plate with large size is assembled in blocks.

The technical scheme includes that 1) the pressed area (cm) of a small impact plate is calculated according to the required molding pressure of a compact product which is more than or equal to 250MPa and the nominal pressure of a pressure device ² ) Not more than 0.4 multiplied by the nominal pressure (ton). And dividing the total area of the impact plates by the area of the small impact plates to obtain the number of the small impact bricks which need to be combined by one impact plate. 2) The small impact plate is made of high erosion resistant magnesium carbon and aluminum magnesium carbon material. 3) The combined edge of the small impact plate adopts a staggered edge structure. And rough twisting before assembly, and then coating high-temperature fire clay to form a large tundish impact plate blank. 4) And (5) curing the large tundish impact plate blank body. And (4) putting the mixture into a kiln for curing treatment at the temperature of more than 200 ℃ and the heat preservation time of more than 20 hours.

Preferably, the small impact plate is made of magnesite, corundum, magnesia-alumina spinel, graphite, carbon binding agent, metal aluminum powder and silicon powder.

The preferable scheme is that the carbon residue rate of the carbon binding agent is more than or equal to 40%, the viscosity is 2-20 Pa.S, and the volatile component is 3-10%.

Preferably, the high-temperature fire clay consists of liquid carbon resin and refractory oxide, the ratio of the liquid carbon resin to the refractory oxide is 20-30: 80-70, and the viscosity of the prepared fire clay is 20-50 Pa.S.

Preferably, the curing treatment means that the curing temperature is more than or equal to 200 ℃ and the heat preservation time is more than 10 hours. The curing temperature is 210-250 ℃ and the heat preservation is 24-36 hours. The curing time is related to the size of the impingement plate. When the size is large, the curing time is long, whereas it is short.

The beneficial effect of this application does: the tundish impact plate has high density, high strength, strong anti-scouring capability and good anti-erosion effect, and the service life of the tundish impact plate reaches more than 60 hours. Obviously reduces the unit consumption of refractory materials and improves the yield of continuous casting blanks.

Drawings

FIG. 1 is an overall schematic view of a composite impact plate for a tundish.

FIG. 2 is a schematic view of the misalignment structure of the composite impact plate for tundish.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention will be further explained with reference to the accompanying drawings and the detailed description thereof.

The first embodiment is as follows:

a 1600 ton press was used to produce tundish impact plates of dimensions 350 x 100. 98 portions of fused magnesite 5-1: 52, 1-0: 25, 12% of 200-mesh fine powder, 8% of-198 graphite, 3% of metal aluminum powder and 3.2% of thermosetting phenolic resin bonding agent are adopted. After mixing the materials in a powerful mixer, forming small impact plates with the size of 350 multiplied by 165/175 multiplied by (50+50), coating high-temperature fire clay on a staggered platform, and then pressing the two small impact plates together. And curing at 220 ℃ for 30h to obtain the high-performance impact plate. Its properties and effects in use are shown in example Table 1.

Example two:

a 2000 ton press was used to produce a tundish impact plate of dimensions 400 x 100. The material comprises 5-1: 52% of 98-electric melting spinel, 1-0: 25% of 98-electric melting magnesite, 15% of 200-mesh fine powder, 5% of-198 graphite, 3% of metal aluminum powder and 3.2% of thermosetting phenolic resin binder. After mixing the materials in a powerful mixer, small impact plates with the size of 400 multiplied by 200/180 multiplied by (50+50) are formed, high-temperature fire clay is coated on a staggered platform, and then the two small impact plates are pressed together. Curing at 240 ℃ for 25h to obtain the high-performance impact plate. Its properties and effects in use are shown in example Table 1.

Example three:

tundish impact plates of dimensions 500 x 100 were produced using a 2500 ton press. White corundum 5-1: 52%, 1-0: 25%, 200-mesh fine powder 4%, alpha-Al ₂ O ₃ 4% of micro powder, 4% of 98 electric smelting magnesite 200 mesh fine powder, 8% of-198 graphite, 3% of metal aluminum powder and 3.2% of an additional thermosetting phenolic resin bonding agent. After the materials are mixed well on a powerful mixer, the impact plates with the size of 500 multiplied by 167/155 multiplied by (50+50) are formed, high-temperature fire clay is coated on a staggered platform, and then the three impact plates are pressed together. And curing at 210 ℃ for 35 hours to obtain the high-performance impact plate. Its properties and effects in use are shown in example Table 1.

Table 1: example tundish impact plate Properties

By comparison with the examples, the composite impact plate of the present invention has very high hot strength and remarkably good compactness. With the addition of graphite, the thermal shock resistance is also very good. The erosion rate is therefore almost 50% lower. Therefore, a very good use effect is inevitable.

Claims

1. The utility model provides a middle package is with compound impingement plate, its characterized in that, the fritter by stamping forming strikes the combination of the slab body and forms, the combination limit of fritter impingement plate body adopts the wrong limit structure to constitute big middle package impingement plate body behind the coating high temperature fireclay, big middle package strikes the slab body and carries out solidification treatment and obtains middle package and use compound impingement plate.

2. The composite impact plate for a tundish according to claim 1 wherein the edges of the misalignment structure are roughened by rubbing before assembly.

3. The composite impact plate for the tundish as claimed in claim 1, wherein the small impact plate blank is obtained by means of impact pressure not less than 250 MPa.

4. The composite impact plate for the tundish according to claim 1, wherein the small impact plate blank is formed by combining a refractory raw material, granular powder and a carbon binder.

5. The composite impact plate for the tundish according to claim 4, wherein the refractory raw material is a combination of a plurality of magnesia, corundum, magnesia-alumina spinel, graphite, metal aluminum powder or silicon powder.

6. The composite impact plate for the tundish according to claim 1, wherein the high-temperature fire clay is composed of liquid carbon resin and refractory oxide, the ratio of the liquid carbon resin to the refractory oxide is 20-30: 80-70, and the viscosity of the prepared fire clay is 20-50 Pa.S.