Non-carbon steel refractory

1, the role of ladle in steelmaking

Ladle is a container for the storage and transportation of molten steel, and its standard name is steel ladle, commonly known as ladle, ladle. At present, the refining process of molten steel outside the furnace is mostly completed in ladle, so ladle plays an important role in the molten steel smelting system.

2. Working environment of ladle

When the steel is connected, the molten steel of about 1650°C is tilted into the ladle from the furnace, and the ladle is not only subjected to strong thermal impact and mechanical impact of the molten steel, but also subjected to a large number of slag and chemical erosion of the molten steel. The bottom of the bag in particular, the damage is worse.

● Ladle is a periodic operation, the temperature difference is large, the thermal cycle is frequent, which also seriously affects the life of ladle, especially some steelmaking enterprises production discontinuity has a greater impact on ladle.

● Due to the popularization of LF furnace refining and vacuum refining technology, the working conditions of ladle are more demanding, the temperature of molten steel is further increased, some as high as 1700°C or even higher, and the retention time of molten steel in ladle is longer, during which the slag erosion of the ladle lining is more serious.

● In the refining process, some ladle is used under vacuum conditions, and some will be subjected to high temperature arc heating, intense blowing stirring, electromagnetic stirring, and the amount of slag is greatly increased, which puts forward higher requirements for the material of ladle.

Significance of neutral non-carbon steel refractory for clean steel (1)

1. Reaction between molten steel and refractory materials

2. Reaction of slag and refractory

      Significance of neutral non-carbon steel refractory for clean steel (2)

Ladle has large capacity, high temperature, long residence time of molten steel and frequent refining

Refractory materials react strongly with molten steel and slag: secondary pollution of molten steel, damage of refractory materials Poor working environment will inevitably lead to the damage of ladle lining materials, melting and peeling ladle resistant materials into molten steel, the carbon element in the current general magnesia carbon system lining materials, inevitably cause carburization effect, seriously affect the quality of steel grades, while increasing the burden of subsequent refining

      Significance of neutral non-carbon steel refractory for clean steel (3)

      Significance of neutral non-carbon steel refractory for clean steel (4)

Corundum and spinel are used as the substrate for non-carbon steel cladding with high high temperature strength, good thermal shock resistance, stable structure and limited resistance to mixing and scouring of molten steel. In addition, in the process of high temperature use under the action of specific external components, in-situ spinel can be formed, and the crystal phase volume will slightly expand, making the cladding brick densified, so as to achieve better resistance to slag erosion and penetration

      Significance of neutral non-carbon steel refractory for clean steel (5)

In situ synthesis of spinel technology, Anetjer introduced spinel components into the carbon-free lining material. The spinel has a strong ionic bond, and the internal structure of the whole spinel is balanced and firm, which makes the spinel have good slag resistance, thereby improving the slag resistance of the whole lining material.

      Significance of neutral non-carbon steel refractory for clean steel (6)

Most of the special steel products have high requirements for the cleanliness of molten steel and need to be refined outside the furnace, and the contact time between molten steel and ladle resistant materials is long. In the refining process, LF and V units are mainly used for a series of purified steel treatment such as heating, desulfurization, decarbonization, degassing and calcium treatment of high technology content and high value-added steel. As a gap atom in steel, carbon becomes the main control object in most special steels, and the requirements are as low as possible. Although VD vacuum decarburization can control the carbon content of molten steel to a fairly good level, the molten steel continues to react with the ladle lining, and carburization will occur, increasing the refining burden.
At present, the slag of ladle is mostly acidic slag, and the erosion of alkaline resistant materials is particularly severe, which will affect the use safety and production rhythm of ladle. Our neutral non-carbon steel ladle is obviously better than alkaline magnesia carbon resistant materials in terms of acid resistant slag.
3, Anaejie neutral non-carbon steel refractory material economic benefits

4, no carbon steel cladding scheme