Submerged Entry Nozzle---Refractory Nozzle

Submerged entry nozzle enjoys performances of purifying liquid steel, prevent liquid steel oxidation, with good liquid steel washing resistance and erosion resistance.

Submerged Entry Nozzle

Introduction

Changxing Refractory's submerged entry nozzle is isostatically pressed from alumina-graphite with zirconia inserts and magnesia seats as required. Argon channels are also available. These pieces are 100% X-ray tested for flaws and cracks prior to shipment. These submerged entry nozzles are engineered to provide maximum life at minimal cost.
Advantages

1. The Submerged Entry Nozzle (SEN) and Submerged Entry Shroud (SES) protect the steel flow from the Tundish to the mould.
2. Submerged Entry Nozzle is fixed inside the Tundish and also functions as a Tundish Nozzle. Submerged Entry Shroud on the other hand is fitted from the outside on the Tundish Nozzle.
3. The body is made of Alumina Carbon quality while the seat and slag zone are made of different qualities as per customer requirements including Zirconiz-Carbon and Magnesia Carbon quality.
4. The SEN and the SES are protected from the outside with a ceramic paper lining.
5. Submerged entry nozzle is served to protect and control the molten steel stream between the tundish and the mould during casting.
Application

Submerged entry nozzle enjoys performances of purifying liquid steel, prevent liquid steel oxidation, with good liquid steel washing resistance and erosion resistance.

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Performance and requirements of refractory materials for ladle

Ladle is to undertake the molten steel, continuous casting of the necessary equipment. Because many steel grades need to be refined in the ladle, including blast argon tempering, fine-grained alloy composition, powder refining and vacuum treatment, Ladle Permeable Brick lining working conditions worse and worse, the working environment is:

(1) The temperature of the molten steel is higher than that of the molded ladle.
(2) The residence time of the molten steel in the ladle is prolonged.
(3) Ladle liner itself volatilizes under high temperature vacuum and undergoes the stirring action of molten steel.
(4) lining to undertake the impact of the role of steel received.
(5) slag erosion of the lining.

Therefore, the requirements for ladle refractory are:
(1) high temperature, can withstand high temperature molten steel for a long time without melting softening.
(2) heat shock, can be repeated to withstand the installation of molten steel, without cracking peeling.
(3) resistance to slag erosion, can withstand slag and slag basicity changes on the erosion of the lining.
(4) has sufficient high temperature mechanical strength, can withstand the stirring and erosion of molten steel.
(5) lining has a certain expansion of the role of high-temperature molten steel, so close contact between the liner into a whole.

Refractory company Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.

Refractory plastics for heating furnaces

Furnace is used to bloom blanks, continuous casting billet, small steel ingot, slab heating to the required temperature of the thermal equipment.
The furnace body components of the furnace mainly include furnace top, furnace wall, furnace bottom, discharge end and feeding end, slope slipping, front wall brackets, slippery and curved slide rails, , The bottom of the water pipes, chute pipes, flues and chimneys, stove and steel structure and so on, in addition to a combustion device, air supply systems, heat exchangers, push steel and so on.

Furnace temperature is generally below 1400 ° C, for continuous and ring furnace, it can be divided into low temperature, medium temperature, high temperature, or preheating, heating and soaking section, the use of temperature Respectively, 800-900 ° C / 1150-1400 ° C / 1200-1300 ° C.

Refractory plastic is a longer time in a high plasticity was hard mud paste-like unshaped refractory material, it is a certain level of the refractory aggregate, fine powder, the right amount of binder, plasticizer, save Agent and water.
In recent years, China's large and medium-sized steel enterprises in the rolling mill furnace top, wall lining work on the overall use or part of the use of refractory plastic can provide the service life of the furnace, and achieved good economic returns.

Refractory company Henan Xinmi Changxing Refractory Material Co., Ltd. Located in Henan Province,China.ChangXing's product portfolio covers shaped products such as refractory materials,refractory brick, refractory castable,refractory nozzle, ceramic fiber, slide gate, etc; unshaped products including repair, construction and casting mixes and mortars.exported to more than 20 countries, such as Thailand, Indonesia, Pakistan, Saudi Arabia, South Africa, Turkey, Iran, Iraq and so on.

The reasons of ladle upper nozzle damage and its reventive measures

Ladle nozzle is widely used in steel plant.

1. The reasons of ladle upper nozzle damage
1) Under the scouring and erosion of liquid steel and steel slag, the slag erosion will occur under wrong operation process.
2) Mechanical damage during installation process.

2. To prevent the damages of sliding gate nozzle system, measures should be taken as below:
1) Use better raw material with high corrosion and erosion resistantance to make the upper nozzle, such as

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Article source:

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Analysis on Performance Requirement of Refractory material in Heat Treatment Furnace

The qualified of anchor brick is similar to the material of furnace lining castables and formed by preeing and being fired at high temperature. Characterized by good thermal shock resistance and high strength, it is used for several heating furnace and has good effect.

Refractory: Any material capable of resisting high temperatures and capable of withstanding high temperature physical and chemical effects.
Heat treatment furnace refractory material performance requirements:
1 has sufficient refractoriness. Refers to the refractory material after heating to a certain degree of softening temperature, but not its melting point.
According to the level of refractoriness, ladle refractory can be divided into ordinary refractories (refractory degree of 1580 ~ 1700 ℃), advanced refractories (refractory degree of 1770 ~ 2000 ℃) and special refractories (refractoriness greater than 2000 ℃).
2 has a certain high temperature structural strength. The structural strength at high temperature is evaluated by the softening point of the load, and the softening point of the load is the pattern
(The size of φ36 * 50mm) under a certain pressure (0.2MPa) conditions, a certain heating rate of heating, measured the sample began to deformation (deformation of the original sample 0.6%) temperature, the temperature is called refractory castable Of the load softening point starting point.
3 high temperature chemical stability.
4 has good resistance to abrupt heat.
5 volume stability at high temperatures.

What are the general requirements for refractories material in electric arc furnaces

General requirements of the refractory arc furnace:
① high refractoriness: arc temperature above 4000 ℃, steelmaking temperature often 1500 ~ 1750 ℃, sometimes as high as 2000 ℃, therefore, require refractories must have high refractoriness.
② high load softening temperature: EAF steelmaking process is under high temperature load conditions, and the furnace to withstand the erosion of molten steel, so the refractory material must have a high load softening temperature.
③ good thermal stability: EAF steel from the steel to the charge within a few minutes of rapid temperature changes, the temperature dropped from the original 1600 ℃ suddenly dropped to below 900 ℃, and therefore requires good thermal stability of refractories.
④ slag resistance is good: in the steelmaking process, slag, furnace gas, molten steel on the refractory company material has a strong chemical erosion effect, so the refractory should have good slag resistance.
⑤ high compressive strength: electric furnace lining in charge by the impact of the charge, the molten steel by the static pressure, tapping the steel by the scour when operating by mechanical vibration, so the refractory brick for sale must have a high pressure strength.
⑥ low thermal conductivity: In order to reduce the electric furnace heat loss, reduce power consumption, requiring the thermal conductivity of refractories to be poor, that is, the thermal conductivity is small.

Measures to extend the life of the ladle refractory material

In the normal production of steel, there are situations occur when the ladle gellan steel.Use good thermal conductivity refractory when lining-up may aggravate this phenomenon, combined with molten steel due to the temperature drop, which will create sticky residue lining the surface of serious problems within the ladle . Here Henan refractories plant was introduced to prolong the life of ladle magnesia carbon brick measures.

1. refractory brick for sale and masonry improve the way

In order to ensure that the masonry and flaking masonry lining less firmly connected properly changing the shape of the brick lining, made of shaped bricks to increase thermal stresses can be compensated by the number of vertical joints and bricks made of arc-shaped surface.Package wall spiral style method masonry, bricks can reduce consumption by more than 15%.

To prevent cracks between the blocks in LF ladle bottom lining erosion, Kobe Steel improved masonry structure. Concentric masonry package by the end of mullite corundum products, the central area (steel flow impact zone) with high alumina castable precast masonry block.This approach allows the masonry thinner than the central region surrounding the bottom half of the pack, lining life increased from 30 times 40 times, repair times reduced by two times 1 times.

Existing interface between the bricks can prevent crack propagation, interaction between the liner and the slag generated.Or between the safety liner and add a layer of tar dolomite working lining tar dolomite ramming material, or in use can be carbonized material.

2. Drying

(1) microwave heating

Microwave heating is a new thermal technology, compared with conventional heating, microwave heating without an external heat source, but the material is heated inside the microwave electromagnetic radiation, promote their movable particle motion, collide with each other so that friction heat. Monolithic refractories for ladle body construction using microwave heating, which greatly speeds up the reaction process, since the temperature difference between the surface and the interior of the small settlement burst release and tissue degradation phenomenon, the entire liner can be quickly heated and uniformly dense tissue . Heating time (conventional heating formerly required 24h) reduced to 8h.

(2) Quick baking apparatus

Anyang Iron and Steel Company second steel mill 25t ladle quick energy-saving baking apparatus using oxygen combustion, so that combustion gas can improve the thermal efficiency of over 50%.The practical production shows that it has a short baking time, adaptable, bake evenly, easy to operate, safe and reliable.Ladle down time from the past 40h 16h.Not only solves the gas pressure is low due to the impact Ladle problems, and effectively improve the baking quality of the ladle, to avoid the containment wall bricks crack phenomenon in the past due to the uneven baking caused.

(3) baking coal oxygen apparatus

Arm spin move or horizontal coal oxygen baking, preheat temperature in 1h refined package can reach 1000 - 1200 ℃. Effectively prevent slag line MgO-C, due to acute heat stress caused by thermal quench. Electric furnace refining temperature and time were decreased and shortened. Improve productivity and ladle life, reduce production costs and coordinate production order also plays a significant role.

3. Maintenance repair

Uneven ladle refractory lining is damaged, it is necessary to take repair, gunning and other measures to shore up weak links, to improve job ladle refractory consumption rate decreased, making the fullest use of the lining, to achieve the purpose of the high life.

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