Refractory Material Technology News: Technical measures for smelting clean steel

Technical measures for smelting clean steel
Smelting clean steel should be based on the variety and application requirements. The operations of hot metal pretreatment-steelmaking-refining-continuous casting should be under strict control. The main technical countermeasures are as

follows:
(1) Hot metal pretreatment. The sulfur content of molten iron in the molten iron desulfurization or triple desulfurization process should be less than 0.005% or even less than 0.002%.
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Article source:
http://www.ruizhirefractory.com/en/new/technical-measures-for-smelting-clean-steel.html

Technical measures for smelting clean steel

Smelting clean steel should be based on the variety and application requirements. The operations of hot metal pretreatment-steelmaking-refining-continuous casting should be under strict control. The main technical countermeasures are as Neutral Ramming Mass

follows:
(1) Hot metal pretreatment. The sulfur content of molten iron in the molten iron desulfurization or triple desulfurization process should be less than 0.005% or even less than 0.002%.
(2) End-point control of converter compound blowing and steelmaking. Improve dephosphorization conditions, increase the final hit rate of the end point composition and temperature, reduce the dissolved oxygen content of the steel grade, Tundish Nozzle

and reduce the number of non-metallic inclusions in the steel.
(3) Slag blocking and tapping. The slag blocking is adopted for tapping, and the thickness of the slag layer in the ladle is controlled below 50mm. Can avoid phosphorus back and improve the yield of the alloy, reduce oxide inclusions.
(4) Ladle slag modification. In the tapping process, slag modifier is added to the steel stream. Reduce iron oxide and adjust ladle slag composition.
(5) Refining outside the furnace. According to the quality requirements of steel grades, one or more refining combinations are selected to complete the refining task of molten steel, to achieve dehydrogenation, extremely low carbonation, High Alumina Brick

extremely low sulfidation, denitrification, reduce inclusions and form control of inclusions, etc.
(6) Protection pouring. The use of protective pouring technology in the pouring process is particularly important for the production of clean steel. The ladle-tundish-crystallizer adopts long nozzle argon seal protection pouring, the

tundish adopts double-layer protective slag, and the crystallizer adopts protective slag. It has the function of adsorbing inclusions and reducing secondary oxidation.
(7) Tundish metallurgy. Organize reasonable molten steel flow and reasonable molten steel residence time in the tundish to promote the floating of inclusions.
(8) Crystallizer operation technology. Choose protective slag with proper performance; immersion nozzle centering and proper insertion depth; pulling speed and liquid level stability; applying crystallizer electromagnetic stirring

technology; controlling the flow of molten steel, which is beneficial to the upward discharge of gas and inclusions and improves the quality of the slab .
(9) Internal quality control of the slab. Use electromagnetic stirring and light pressure technology to reduce center looseness, center segregation and shrinkage. Increase the density of the slab.
(10) Use straight crystallizer arc continuous casting machine and vertical curved continuous casting machine to facilitate the floating of inclusions.

Article source:
http://www.ruizhirefractory.com/en/new/technical-measures-for-smelting-clean-steel.html

Refractory Material Technology News: Nozzle filling compound treatment method

Nozzle filling compound treatment method
In view of the impact of the nozzle filling compound on the quality of the molten steel in the tundish, part or most of the nozzle filling compound, which is very polluted by molten steel, is taken away manually, which greatly reduces

the pollution to the molten steel and reduces the impact on the tundish. Corrosion of refractory materials. The specific operation method is as follows:
(1) Raise the ladle to a high position under the action of the hydraulic cylinder of the ladle turntable.
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Article source:
http://www.ruizhirefractory.com/en/new/nozzle-filling-compound-treatment-method.html

Nozzle filling compound treatment method

In view of the impact of the nozzle filling compound on the quality of the molten steel in the tundish, part or most of the nozzle filling compound, which is very polluted by molten steel, is taken away manually, which greatly reduces the pollution to the molten steel and reduces the impact on the tundish. Corrosion of refractory materials. The specific operation method is as follows:
(1) Raise the ladle to a high position under the action of the hydraulic cylinder of the ladle turntable.
(2) Put on the ladle shroud, the lower port of the ladle shroud leaves the liquid surface and slag surface of the impact zone.Silica Ramming Mass
(3) Place the container for collecting nozzle filling compound under the ladle shroud port.
(4) Open the slide mechanism to the maximum position, that is, the upper and lower slide holes are aligned.High Alumina Brick
(5) Collect the nozzle filling compound.
(6) Approximately 1/2 to 2/3 of the nozzle filling compound will be collected, and the steel will be casted immediately.
(7) Lower the ladle and insert the ladle shroud into the molten steel in the impact zone.

Article source:
http://www.ruizhirefractory.com/en/new/nozzle-filling-compound-treatment-method.html

How to use taphole filler

refractory suppliers

During the period of electric furnace smelting, the taphole filler of the contact part with the molten steel produced the sintering layer, thus preventing the molten steel from penetrating downwards. refractory brick manufacturers The non sintered taphole filler under the sintering layer can flow smoothly when the steel plate is opened by the tapping, and the sintering layer is broken by the pressure of the molten steel to achieve the purpose of automatic pouring. When the electric furnace is finished tapping, when the stuffing is put into the EBT platform, the refractory material taphole filler can flow out of the tapping hole automatically, and the molten steel flows into the ladle. refractory brick china The automatic casting rate can reach more than 90%.

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http://www.ruizhirefractory.com/en/new/how-to-use-taphole-filler.html
Email: sales@ruizhirefractory.com

The selection or refractory material for silicon package

refractory

At present, the most common silicon package is a ton of garden cone silicon package, the diameter of 1.2-1.5 meters, the mouth diameter of about meters.

Although this silicon package with refractory material is not much, but it is very particular about. General silicon package with two castables, one is silicon package with corundum refractory castable, used in the silicon package pouring hole site. One is the silicon package with high-performance castable, used in the package along the silicon package parts.
Silicon package pouring hole, high temperature, impact larger. Optional silicon package special corundum castable, this castable has excellent high temperature performance, and anti-erosion, high temperature state volume stability, when used in silicon package can be cast with corundum castable prefabricated parts (prefabricated general mouth Diameter of 250-300cm height, the mouth diameter of about 150cm. Park cone). This easy to use excellent construction.
Silicon package with high-performance castable silicon package castable silicon package corundum castable 1 ton of silicon package refractory
Silicon cladding is made of refractory alumina brick, refractory brick suppliers thickness of about 150cm. The total weight of about 1 ton.
Silicon package along the 10-15 cm at the silicon package with high castable, high-performance castable wear resistance, thermal shock, high strength, heat resistance and strong features, so the package along the edge of high performance Casting material, but also cheap, extremely reasonable.
Although the small package of silicon material is small, but very particular about, such as the wrong choice of refractory brick manufacturers. It is a waste of materials, a waste of costs. Therefore, the choice of materials, it is recommended or use the above materials as well. In this way, that is economical and practical.


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The impact of sintering temperature and holding time for refractory materials

refractory

Sintering temperature and holding time is an important external sintering refractory material. With the increase of temperature, the vapor pressure of the material increases, the diffusion coefficient increases, and the viscosity of the liquid phase decreases, thus facilitating the process of material transfer such as evaporation-aggregation, diffusion of ions and vacancies, particle rearrangement, viscous and plastic flow. So that sintering speed. Prolonging the sintering time can also promote the completion of sintering. However, in the latter stage of sintering, unreasonably prolonging the sintering time can sometimes aggravate the secondary recrystallization, but can not obtain a sufficiently dense product.
The firing temperature of refractory products should be controlled within the sintering temperature range, at this temperature should maintain the appropriate sintering time to complete the sintering, if continue to increase the temperature deformation of the body.

The impact of the atmosphere:
Atmosphere directly affects the firing effect and product quality. Burning atmosphere can be divided into general oxidizing atmosphere, neutral atmosphere and reducing atmosphere. Different materials for the green body should choose a different atmosphere to ensure the physical and chemical reactions in the body smoothly. At the end of sintering, the atmosphere (the type of gas in the pores) has an influence on the sintering when the pores are closed. Study of Al2O3 sintering found that when the gas solubility in the lattice is small and slow diffusion, the isolated pores is not easy to discharge from the body. For example, Al2O3 is sintered in argon and air. On the contrary, when the diffusion rate of gas in the lattice is fast enough, the atmosphere has no effect on the sintering end. If the atmosphere to control the defect structure has a certain role, you can speed up the proliferation and conducive to sintering.

It must be pointed out that the influence of firing atmosphere depends on the material composition, sintering conditions, the type and amount of additives, and other factors. Therefore, specific analysis should be conducted for different temperatures.

In the actual sintering process, the impact of the above factors are interrelated and mutually restrictive. The factors that play a major role under different conditions may be different.


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