What are the requirements of high-efficiency continuous casting for molten steel?

 Compared with ordinary continuous casting, high-efficiency continuous casting has stricter requirements for molten steel; it is mainly reflected in several aspects:

(1) Temperature: Compared with conventional continuous casting, the residence time of high-efficiency continuous casting molten steel in the mold is shortened by 1/3-1/4. In order to obtain the same thickness of the shell, in addition to further strengthening the cooling capacity of the mold , to ensure that the low temperature molten steel is a necessary pouring condition, and the high molten steel temperature will also aggravate the secondary oxidation and the corrosion of the lining. Too low temperature can also cause quality defects. Low temperature casting and strict temperature control are the prerequisites for efficient continuous casting.

(2) Chemical composition: High-efficiency continuous casting requires strict control of the chemical composition of molten steel. If multiple furnaces are continuously poured, the difference in carbon content between furnaces is required to be less than 0.02%, and the Mn/S ratio, S and P contents should be strictly controlled within the required range.

(3) Cleanliness: As the market has higher and higher requirements for steel quality, higher requirements have been placed on the cleanliness of steel. For example, the total content of five major elements of phosphorus, sulfur, oxygen, nitrogen and hydrogen in Pohang deep-drawing steel in South Korea has been reduced to 0.008%. The cleanliness of molten steel is not only reflected in smelting, but also clean pouring, that is, molten steel protection during the pouring process, is also an important guarantee for efficient continuous casting.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products 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:What are the requirements of high-efficiency continuous casting for molten steel?
Company name: Henan Changxing Refractory Materials Co.,Ltd
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What are the structural characteristics of high-efficiency continuous casting machine?

 Compared with traditional continuous casting, high-efficiency continuous casting is characterized by high drawing speed, high quality, high efficiency, high operating rate, and high-temperature slabs. In order to meet the requirements of high-efficiency continuous casting, the high-efficiency continuous casting machine has the following structural characteristics:

(1) High-efficiency continuous casting must firstly have the best model suitable for the production of continuous casting billet steel, that is, the equipment level of smelting equipment and casting machines must match the steel grades that achieve high-efficiency continuous casting.

(2) The improvement of the pulling speed makes the continuous casting machine develop in the direction of increasing the arc radius and the vertical bending type.

(3) The main equipment requires long life, low failure rate, high reliability, quick replacement and quick accident handling.

(4) The level of automation is high, and the high-efficiency continuous casting machine realizes automatic production.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products 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:What are the structural characteristics of high-efficiency continuous casting machine?
Company name: Henan Changxing Refractory Materials Co.,Ltd
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What are the requirements of high-efficiency continuous casting machine for tundish?

 The high-efficiency continuous casting machine has a high operating rate, so the accident rate of the tundish truck is required to be low. The lifting system of the tundish truck should be durable and stable to meet the requirements of protection and casting. In particular, the weighing device should be reliable and have a long service life to ensure the monitoring of the liquid level of the tundish, so that the liquid level of the tundish is stable and the fluctuation is small, so as to meet the needs of high-efficiency continuous casting. The lateral movement of the tundish truck should be stable and precise to ensure the accurate alignment of the nozzle and the mold. At present, tundish trucks with high and low legs are mostly used on billets. This tundish truck is easy to operate and hydraulically driven, which is faster and more stable.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality refractory products 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:What are the requirements of high-efficiency continuous casting machine for tundish?
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The use of aluminum-magnesium-carbon bricks on LRF

 When MgO-C bricks are used for refining ladle furnaces and ladles, they are mainly used in headroom and slag lines. According to the operating conditions, the refractory materials used in these parts must have high temperature resistance, thermal shock resistance, and resistance to mechanical corrosion caused by slag erosion.

So in the past, these parts used magnesia-chromium refractory materials, but considering that chromium pollutes the environment, its consumption has been reduced, and now magnesia-carbon bricks are used.

Since the magnesia-carbon bricks in the new ladle will be severely damaged during the preheating process, the loose decarburized layer can reach 30-60mm thick. This layer is washed away during the injection of molten steel, bringing the magnesia grains into the slag.

Obviously, preventing the carbon in the magnesia carbon bricks from being burned out during preheating is one of the important steps to improve the service life of the magnesia carbon bricks at the ladle clearance and slag line.

Its technical measures, in addition to compounding the composite antioxidant into the magnesia carbon brick, the key is to cover the surface of the magnesia carbon brick with an alkali-containing low-melting glass phase liquid after lining, so as to protect the ladle magnesia carbon brick. Carbon is not burned off during the preheating process of the ladle.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality ladle 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 use of aluminum-magnesium-carbon bricks on LRF
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Deoxidizer commonly used in steelmaking

 What are the commonly used deoxidizers for steelmaking? Let's learn.

1. Ferro Silicon

The main components of ferrosilicon are iron and silicon. It is a commonly used deoxidizer for steelmaking and foundry. The chemical affinity between silicon and oxygen is very large, and it can effectively convert oxygen into silicon dioxide. Add a certain amount to steel silicon can effectively improve the strength, hardness and elasticity of steel.

2. Silicon Metal

Metallic silicon is also a commonly used deoxidizing material for steelmaking, which can effectively remove oxygen in molten steel, and reduce the reaction capacity during smelting while deoxidizing, making deoxidation safer!

3. Carbon Ferromanganese (Carbon Ferromanganese)

The main components of ferromanganese are manganese and iron. Ferromanganese is often used as a casting deoxidizer, desulfurizer and alloy additive. Using ferromanganese as a steelmaking material can effectively deoxidize and increase the hardness and durability of steel!

4. Silicon barium alloy

Silicon barium is a new type of multi-element alloy. Its advantage is that the content can be customized, and the internal silicon element can also be customized to make more deoxidation!

5. Silicon slag is the bottom slag produced by smelting ferrosilicon and metallic silicon.?

It still contains a certain amount of silicon. The silicon slag can be used as a deoxidizer for steelmaking, and it can also be purified again to produce ferroalloy products with high silicon content. It can effectively reduce the cost of steelmaking and improve the efficiency of manufacturers and product quality.

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What are the refractory materials for the bottom of the AC EAF

 The AC EAF has a long history of steelmaking, so its refractory materials for the bottom of the furnace have also undergone changes. The bottom of the furnace is rammed with asphalt tar magnesia or brine magnesia. Because brine magnesia is eroded quickly at the bottom of the furnace, it cannot meet the requirements for use. Although asphalt tar magnesia has better durability, it is troublesome to construct and has environmental pollution. Therefore, more magnesia bricks and low-grade magnesia-carbon bricks are used to build the bottom of the furnace. The durability of the brick-built furnace bottom is very good, but the masonry is labor-intensive and time-consuming.

By the 1990s, my country began to use the furnace bottom dry ramming material. It is simple and convenient to construct, and does not need to be baked. After the construction is completed, it can be directly used for steelmaking. The material is magnesium calcium iron dry vibrating ramming material. Using the low melting point calcium ferrite it contains, when the temperature rises above 1200 °C, it can quickly sinter to produce strength. Under the hydraulic pressure of molten steel, it can rapidly sinter and shrink, the shrinkage reaches 4% to 5%, and the bulk density increases to more than 3.0 g/cm3. Has particularly good corrosion resistance and good use results. The consumption of steel per ton of refractory materials is reduced from 4 to 8 kg of asphalt magnesia bricks to less than 2 kg. Some modern EAF bottom dry materials consume as little as 0.3 kg per ton of steel, which is mainly corresponding to the steelmaking process technology; In the process of use, the material is sintered layer by layer, sintered and densified near the molten steel, resisting The erosion and scouring of molten steel, the transition layer is under the sintered layer, and the loose non-sintered layer is under it. This loose layer has low density and low thermal conductivity, which play an important role in the insulation of the EAF. After years of promotion and development, the vast majority of electric furnace bottoms in my country use this kind of ramming material.

The construction and use of the furnace bottom dry material are the key factors affecting the use effect. The bottom material should be called dry vibratory castable more appropriately. Because the vibration densification density of the material is more than 0.2g/cm3 higher than that of ramming, the erosion resistance will be significantly improved. Kairuid kiln believes that the dry material should be vibrated for construction, especially for the DC EAF bottom that is not easy to be repaired. When repairing, the slag and scrap steel at the bottom of the furnace must be cleaned up, otherwise the steel slag under the repairing material may melt when used to a certain extent, and the furnace bottom material will float up under the impact of the steel block. When tapping, the floating bottom block may block the tapping hole and affect the tapping. In the process of use, the furnace bottom should be observed at any time. When there is a floating, it should be repaired in time (generally, the same kind of material can be filled to the pit) to prevent the floating from further expansion and prevent the occurrence of steel breakout. It is worth noting that when using in the first few furnaces, due to the thin sintered layer, the ability to withstand the impact of scrap steel is weak, so light and thin materials should be added, and the feeding basket should be lowered to prevent the scrap steel from having a large impact on the bottom of the furnace.

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality EAF dry ramming mix 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:What are the refractory materials for the bottom of the AC EAF
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Brief introduction of tundish lining coating

 In the process of steelmaking, the tundish is the transition device between the mold and the ladle. The use of the tundish can make the molten steel better and more smoothly injected into the mold, and can ensure the stability and stability of the molten steel and the effect of cleaning the molten steel. Therefore, the tundish is used in steelmaking. The role in the process cannot be underestimated. This article briefly introduces the characteristics and technological process of the tundish dry vibrating material.

The refractory materials used in the tundish are more miscellaneous and the turnover is fast, so the refractory dry vibrating material is a consumable material. The tundish refractory lining mainly includes thermal insulation layer, permanent layer and working layer. The thermal insulation layer of the tundish has been using thermal insulation fibers or thermal insulation bricks with little change. In the mid-1970s, the permanent layer was mainly built with clay bricks, and later with high-alumina bricks. At first, the working layer and permanent layer of the tundish were integrated, and most of them were made of clay bricks. However, with the development of metallurgical technology, clay bricks as the working layer and permanent layer of the tundish could not meet the requirements for service life, and they were damaged by corrosion. Seriously, causing molten steel to be contaminated in the tundish. Later, the permanent layer was cast as a whole using high-alumina castables. In the early days of the working layer, aluminum refractory bricks were used. Later, in order to keep the temperature change of the molten steel in the tundish not exceeding 15 °C during casting, the working layer began to use a thermal insulation board. Replaced by refractory paints and refractory spray coatings, with the development of tundish refractories, the latest dry vibrating materials have begun to replace spray coatings with significant advantages. The refractory material for the tundish working layer has gone through the development of refractory clay brick (permanent layer is working layer), thermal insulation board, spray paint (spray material) and the latest dry vibrating material (ie dry working lining).

We Changxing Refractory Material Co.,LTD is professional manufacturer and supplier of refractory materials for more than 30 years. Our high quality tundish dry vibrating mix 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:Brief introduction of tundish lining coating
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