2016年10月26日星期三

Submerged Entry Nozzle---Refractory Nozzle

Submerged Entry 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.

Content source:
http://www.yilongrefractory.com/ProductServletOne?id1=3&id=51

2016年10月25日星期二

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.

2016年10月17日星期一

Refractory plastics for heating furnaces

Checker Brick
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 brickrefractory 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.

2016年10月12日星期三

The reasons of ladle upper nozzle damage and its reventive measures

Ladle nozzle is widely used in steel plant.
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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2016年10月9日星期日

Analysis on Performance Requirement of Refractory material in Heat Treatment Furnace

Anchor Brick for Heating 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.

2016年10月8日星期六

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

Henan Xinmi Changxing Refractory Material Co., Ltd.
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.

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