Converter Lining Repair with Bricks

In the process of steelmaking in converter, due to the impact of molten iron and scrap on the lining, the scouring of the lining in the smelting of molten steel and slag, and the chemical erosion of the slag to the lining, the converter lining will be damaged to varying degrees during use. The lining is gradually thinned. When the lining is thinned to a certain thickness, the damaged part of the lining must be repaired in time.
In order to improve the converter operation rate, the principle of rapid sintering of magnesium carbide ladle bricks and residual slag of the converter at high temperature is utilized, and the existing furnace technology is boldly innovated and improved, and the bricks are used instead of materials to fix the converter. Fixing with firebricks saves more time and cost when compared to ramming mass.
Brick repair is a kind of furnace protection method with low cost and short sintering period. After the steel is finished, the steel can be repaired by pouring the residual bricks that meet the requirements of the furnace into the converter. By pouring it to the position need being repaired, using the residual heat in the slag after tapping, where the converter is damaged, the slag and the ladle are quickly sintered and formed to achieve the purpose of repairing the lining.
Article Source:Converter Lining Repair with Bricks
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Refractory design concept on reheating furnace

1. The plastic refractories can have high refractoriness and high flexural strength. Its function is to directly contact the flame in the furnace and resist the erosion of the furnace gas. According to the difference of working temperature of various parts inside the furnace body, different grades of plastic can be selected to reduce the construction cost.
2. The thermal insulation coefficient of the lightweight thermal insulation brick is between the plastic and the fiber refractory material, and its working position is also between the two. However, because there are many parts in the furnace body that are in direct contact with the plastic and fiber refractory materials, the calculation of the heat dissipation of the furnace body is based on the refractory material with the smallest thermal conductivity, so its chemical composition and physical properties can be neglected.
3. Because of the large thermal conductivity of plastics, in order to reduce the energy loss of the reheating furnace and improve the resource use efficiency, a fiber refractory material with very low thermal conductivity is designed and used together. Compared to plastics, fiber refractories can be considered as 0, ie insulation materials.
4. According to the particularity of the furnace body and the convenience of construction, fiberboard is used in the furnace wall, and the fiber blanket is used at the top of the furnace. Because of the limited space in the roof, a thin ceramic fiber blanket with a lower thermal conductivity is used.

Article Source: insulation brick
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Steel-making

Steel is made by pig iron produced by blast furnace and DRI sponge iron and scrap as raw material, using different melting methods into steel, which include converter steelmaking method, open hearth furnace, electric arc furnace steelmaking etc. three categories. All the three kinds of steel-making process can meet the general quality requirements of steel users.

In order to meet requirements for higher quality and more varieties of high-grade steel, there has a variety of handling methods for molten steel outside of the furnace (also known as refining), such as blowing argon, vacuum degassing and desulfurization outside of furnace etc. By additional refining processing of molten steel produced from converter, open-hearth furnace and electric arc furnace etc., we can get advanced steel grades.

For some high-quality steel for special purpose and special requirements, if further processing outside of furnace still can not meet requirements, then we will use a special method for steel refining, such as ESR, which is a complicate refining process need secondary refining. After got molten steel from converter, open-hearth furnace or electric arc furnace steel smelting, do casting for forging to make it as electrode, then start secondary refining by heating with remelting slag.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
Article Source: refractory raw materials
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Refractory properties

The physical functions of refractory materials include structural function, thermal function, mechanical function, function of use and homework function.
The structural functions of the refractory include porosity, bulk density, water absorption, transthoracic, stomatal pore size distribution, and the like.
The thermal function of the refractory materials includes thermal conductivity, thermal expansion coefficient, specific heat, heat capacity, temperature coefficient, thermal emissivity, and the like.

The mechanical properties of refractory raw materials include compressive strength, tensile strength, flexural strength, torsional strength, shear strength, impact strength, wear resistance, creep, bond strength, modulus of elasticity, and the like.
Refractory use functions include refractoriness, load softening temperature, re-firing line change, thermal shock resistance, slag resistance, acid resistance, alkali resistance, hydration resistance, CO corrosion resistance, electrical conductivity, oxidation resistance wait.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
Article Source: refractory raw materials
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Why is the R.U.L of refractory materials a key indicator?

The actual temperature that the refractory product can withstand is slightly higher than the load softening temperature, mainly for two reasons. First, in actual use, the load on the refractory product is generally lower than the load during the measurement; the second is the masonry in metallurgy. The refractory bricks in the furnace are only heated on one side.
Since the temperature experienced in actual use is higher than the load softening temperature, higher requirements are imposed on the refractory products. The softening temperature of the refractory product depends mainly on its chemical mineral composition and microstructure. The crystalline phase forms a network backbone, and the load softening temperature of the material is high. If the structure is dispersed in the liquid phase in an island shape, the load softening temperature is determined by the content of the liquid phase and its viscosity. For example, the more the liquid phase or the smaller the viscosity, the lower the load softening temperature. The interaction of both the crystalline phase and the liquid phase also changes the amount and nature of the liquid phase. The degree of compactness of the product also has a certain influence on the softening temperature of the load. The commonly used magnesium brick phase composition, mainly periclase crystals, is bonded together by the combination, so the load softening temperature of the magnesium brick depends on the nature of the combination. The combination of magnesia bricks is generally a low-melting silicate phase such as calcium forsterite and magnesium rosewood. Due to the melting point phase of the periclase crystal, the viscosity at low temperature is low, and the magnesia brick exhibits a low load softening temperature. This is where the magnesia fire bricks need to be tackled.
Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.
Article Source:refractory product
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Sliding gate damage theory and meaning of conjunction

Ladle slide gate plate mainly contains two types, alumina carbon and alumina zirconium carbon. With steel production increasing and steel quality improving, calcium treatment process is applied, therefore, calcium content in the melton steel increased. Using alumina carbon and alumina zirconium carbon slide gate plate when casting steel, SiO2 and Al2O3 in the slide gate plate would mixed with [Ca], [CaO] in the melton steel or slag and get into low-melting point materials and feldspar, which would cause damage of slide gate plate. This type low-melting point materials would be easy to crushed down by erosion, new low-melting point material would re-appear. This progress would cause the erosion heavier, in which way the slide gate plate would be damaged gradually.

Conjunction of slide gate plate can reduce the number of turnover ladle, low down ladle serves and turnover pressure. In addition, slide gate plate conjunction can low down labor working, improve ladle lining temperature, thus low down casting temperature and bring a number of benefit for production and reducing cost.
From Year 2008, our factory succeed to develop double conjunction and from Year 2010, triple conjunction is developed. With the triple slide got into the normal production, on-site production, reduce labor intensity, the effect of reducing the cost of generation is very obvious.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Sliding gate damage theory and meaning of conjunction
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Silica ramming mass lining for tundish

Because of low investment, induction furnace is still very popular in worldwhile. Out of power, financial and other elements limit, many steel plants can not do continues casting. In this way, the tundish can only do sequential for 2 or 3 heats, or even 1 heat. In this condition, many factories are using tundish board, which should be broken down after one casting.
Say for one 2-strands tundish, cost for one set tundish board would be 20-25 USD. One casting service life would be a very big cost, and also bring a heavy labor work. To sort out this problem, many of Chinese small factories choose to use silica ramming mass to do tundish lining. After every casting, they would operate as following:

1. Pure out all melton steel.
2. Blow the tundish nozzle with oxygen lance.
3. Clean slag inside the tundish.
4. Cool down the tundish in normal temperature.
5. Change the sizing nozzle.
6. Preheat the sizing nozzle and start to use the tundish again.

In this way, we should only change the tundish nozzle every casting. For the silica ramming mass lining, it would last at least 10 castings, which would save a big cost from using tundish board.
For further details, please feel free to contact us, we would be your reliable partner.

Changxing refractory provides refractory products, calcium silicate products, castable & mortar, china refractory brick, ceramic fiber felt, ladle & tundish nozzle, ceramic fiber with high quality for you. Such as high alumina refractory bricks, magnesia carbon brick, clay refractory bricks and other refractory products.

Article Source:Silica ramming mass lining for tundish
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/