Reasons for steel leakage between ladle slide gate and preventive measures

 The sealing protection of the ladle sliding nozzle is mainly at the connection between the upper nozzle and the upper slide, and the lower slide and the lower nozzle. In the pouring process, generally after pouring one or two furnaces of molten steel, the lower slide plate and the nozzle must be replaced and reassembled. The sealing protection adopts fibrous or mortar gaskets to ensure the high cleanliness of the molten steel and the uniformity of the internal quality of the casting slab.

Hydraulic transmission of sliding nozzle: Large and medium-sized ladle generally use hydraulic transmission to solve the problem of opening and closing of sliding nozzle. Hydraulic transmission is driven by liquid (common oil) as the working medium. Because the liquid has almost incompressible characteristics, when the liquid is filled with a closed container (consisting of oil pumps, pipes, valves, cylinders, etc.), the liquid is pressurized by the oil pump, and it can lose this pressure through pipes, valves, etc. It is transmitted to the oil cylinder very small, causing the oil cylinder to move and realizing hydraulic operation.

Reasons for steel leakage between ladle slide gate and preventive measures ：

(1)The reason for the leakage of the gap between the drain and the lower sliding plate: the sliding plate is not baked after pre-installation; the cement is not evenly coated during installation, resulting in gaps; there are bricks in the cement to make the contact loose.
Preventive measures: The fire mud must be clean during installation, the joints must be evenly seamed, and can only be used after baking and drying.

(2)The reason for the leakage of the upper and lower slide plates: the sliding surface is not flat; the upper and lower slide plates are cracked at the edge of the injection hole; the adjustment operation is not tight or the front and back are uneven.
Preventive measures: pay attention to choosing flat skateboards. Do not use skateboards without steel hoops to prevent cracking at the edge of the injection hole; adjustment operations should be tight and even before and after.

(3) The reason for the leakage of the gap between the upper nozzle?and the upper sliding plate: the upper sliding plate and the upper sliding plate are not evenly coated with mud; the mass in the fire mud causes the male and female mouths to be insufficiently deep and disconnected; the gap is too large.
Preventive measures: the fire mud should be clean, and the joints should be evenly cracked.

Article Source:Reasons for steel leakage between ladle slide gate and preventive measures
Company name: Henan Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com/

The advantage and feature of tundish dry vibration mix

 

1. Overview of tundish dry vibration mix

Dry vibration mix is an amorphous refractory that is formed by vibration without adding water or liquid binder. Under the action of vibration, the material can form a dense and uniform whole, which can be strengthened by thermosetting bonding agent or ceramic sintering agent when heated. Vibrating material is composed of refractory aggregate, powder, sintering agent and admixture. Its characteristics are: this kind of material is easy to flow under the action of vibration force, and the powder can fill the very small pores between particle accumulations even under the action of small vibration force, and obtain a dense body with higher filling density. In use, it is heated to form a working surface with certain strength. However, there are still parts of the non-working face that are unsintered and present the original dense packing structure.
This structure helps to reduce the stress caused by expansion or contraction; Helps to hinder the spread and extension of cracks; Helps prevent the intrusion of molten metal, and facilitates unpacking and cleaning. This material is constructed on the construction site by vibration method, which is simple in construction, short in construction period, does not need maintenance and baking, and can directly raise the temperature quickly and put the working layer into use.

2.The characteristics of tundish dry vibration mix

2.1 Rapid construction, the use of suitable construction methods can complete the operation within a few minutes, which greatly reduces the labor intensity of the workers and reduces the safety hazards caused by human factors.?
2.2 Dry molding can be put into use without long-term baking, which reduces energy consumption and greatly speeds up the turnover of the tundish.
2.3 Good anti-corrosion performance, improve the life of the lining, meet the demand for long-term pouring steel, and greatly reduce the cost of steelmaking.
2.4 Relying on phenolic resin as a binder to obtain demoulding strength, reducing phosphorus pollution and purifying molten steel, which can meet the requirements of smelting different steel grades, but resin-bonded dry vibration mix are easy to increase carbon.
2.5 There is a reasonable line change under various temperature conditions, which is easy to turn over.
2.6 Compared with the use of paint, the tundish dry construction method overcomes the shortcomings of manual application, especially the significant increase in service life meets the requirements of continuous operation in the steel industry. It has been rapidly applied in recent years and has shown the trend to completely replace tundish coatings.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality magnesia carbon bricks are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:The effect and function of tundish furnace
Company name: Henan Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.com

The effect and function of tundish furnace

 The continuous casting tundish was originally used for the heat preservation of molten steel, and its main purpose was to distribute and rectify molten steel. With the successful development of technologies such as slow cooling of molten steel, molten steel reheating technology, argon gas sealing technology, gas stirring technology and removal of non-metallic inclusions in molten steel, continuous casting tundishes have become the most important part of the final stage of the steel smelting process. The main refining vessel is developing to a large scale.

1 Purification function

To produce high-purity clean steel, install porous air-permeable bricks at the bottom of the tundish or embed porous tubular gas distributors between the working layer and permanent layer, or install porous bricks on the slag retaining wall to blow argon to make argon bubbles. Float evenly from the bottom to promote the removal of inclusions. These devices can eliminate the hydrogenation of molten steel in the initial stage of pouring, reduce the oxide inclusions in the molten steel, and reduce the defects caused by AI2O3 inclusions on the tin plate.

2 Temperature adjustment function

In order to make the temperature difference of molten steel before, during and after the tundish be less than 5℃ and close to the liquidus temperature during the pouring process, expand the equiaxed crystal area of the casting slab and reduce the center segregation, small scrap steel and iron injection can be adopted to the tundish casting?powder and other measures to adjust the temperature of molten steel.

3 component fine-tuning

The central hole of the tundish stopper rod feeds cored wires such as aluminum, titanium, boron, etc. To the mold to realize the fine adjustment of the microalloy composition in the steel, which not only increases the cost of easy oxidation elements, but also avoids nozzle blockage.

4 Refining function

Add double-layer slag to the surface of the molten steel in the tundish to absorb the floating inclusions in the molten steel, or feed the calcium wire in the tundish to change the shape of AI203 inclusions to prevent nozzle blockage.

5 heating function

In the tundish, induction heating and plasma heating are used to accurately control the molten steel pouring temperature within ±3~5℃. In the initial stage of continuous casting, the tundish heating is used at the end of ladle pouring to compensate for the decrease in molten steel temperature and keep the molten steel temperature near the target. This is conducive to the stability of the pouring operation and improves the quality of the slab. During the pouring period, proper heating can compensate for the natural cooling of molten steel. The heating method uses induction heating and plasma heating.
We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality magnesia carbon bricks are good sold to many countries say South Africa, Bangladesh, Indonesia, Malaysia, etc. Shall any interests, welcome to contact us. Our team would make best to be your reliable partner!

Article Source:The effect and function of tundish furnace
Company name: Henan Changxing Refractory Materials Co.,Ltd
Email:info@cxrefractories.com
http://www.cxrefractories.com/