Development of VOD ladle lining refractories

 Magnesia-chrome brick was first used in VOD ladle lining because of its excellent slag resistance. However, under intermittent operation of VOD ladle, magnesia-Chrome brick is easy to produce spalling damage and poor thermal shock resistance. Because of the environmental protection of hexavalent chromium, the use of chromium-containing refractories is more and more restricted. At present, domestic stainless steel steel mills have rarely used magnesia-chrome brick.

In Europe, VOD ladle lining is mostly made of (magnesium) dolomite bricks. Compared with magnesia-Chrome brick, dolomite brick has good thermal shock resistance due to its high temperature flexibility. Most VOD ladles in China use magnesium-calcium bricks fired at high temperature. Although magnesium-calcium brick has the function of purifying molten steel and has better thermal shock resistance than magnesium-chromium brick, the content of CaO in the brick reduces slag erosion resistance under the condition that the slag composition of VOD ladle varies greatly and is mainly acidic slag. Due to the hydration problem, magnesium-calcium brick is not suitable for intermittent production, and the management of storage, use and other aspects puts forward very high requirements.

In the smelting of low carbon and ultra-low carbon stainless steel, stainless steel plants are reluctant to use magnesium carbon brick for fear that the liquid steel may be carburized by using magnesium carbon bricks in VOD ladle. In fact, these problems can be minimized by using low-carbon magnesium-carbon bricks. Although low carbonization tends to reduce the thermal shock resistance, the bricks with excellent thermal shock resistance can be developed by selecting the best amount of special asphalt and antioxidant.

Article Source:Development of VOD ladle lining refractories
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: info@cxrefractories.com
Website:http://www.cxrefractories.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/

The importance of refractory design

Refractory design remains the most fundamental factor in furnace construction. Refractory design details and proven technology consideration is of paramount importance to come up with an optimum furnace life and to maintain productivity in the life span of the furnace lining.

The failure to produce a technically or operationally durable refractory design lining could give rise to premature deterioration of the refractory lining and furnace shell.

The premature failure of the furnace lining will lead to extensive heat losses, furnace bath shift, change in taphole orientation and alteration of the Pitch Circle Diameter. In this way, the pre-design of refractory lining is very important, we must pay attention to every details, finding out the most suitable refractories for each part.

Article Source:The importance of refractory design
Company name:Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The importance of refractory design effect for submerged arc furnace’s working performance

Refractory design remains the most fundamental factor in furnace construction. Refractory design details and proven technology consideration is of paramount importance to come up with an optimum furnace life and to maintain productivity in the life span of the furnace lining.

The failure to produce a technically or operationally durable refractory design lining could give rise to premature deterioration of the refractory furnace lining and furnace shell.

The premature failure of the refractory furnace lining will lead to extensive heat losses, furnace bath shift, change in taphole orientation and alteration of the pitch circle diameter. In this way, the pre-design of refractory furnace lining is very important, we must pay attention to every details, finding out the most suitable refractories for each part.

If you want to learn more about this, please contact us. 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: Intermediate Frequency Induction Furnace Lining Material
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The importance of refractory design effect for submerged arc furnace’s working performance

Refractory design remains the most fundamental factor in furnace construction. Refractory design details and proven technology consideration is of paramount importance to come up with an optimum furnace life and to maintain productivity in the life span of the furnace lining.

The failure to produce a technically or operationally durable refractory design lining could give rise to premature deterioration of the refractory furnace lining and furnace shell.

The premature failure of the refractory furnace lining will lead to extensive heat losses, furnace bath shift, change in taphole orientation and alteration of the pitch circle diameter. In this way, the pre-design of refractory furnace lining is very important, we must pay attention to every details, finding out the most suitable refractories for each part.

If you want to learn more about this, please contact us. 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: Intermediate Frequency Induction Furnace Lining Material
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

The importance of correct refractory design

As we all know, the refractory design remains the most fundamental factor in all furnaces construction. Refractory design details and proven technology consideration is of paramount importance to come up with an optimum furnace life and to maintain productivity in the life span of the furnace lining.

The failure to produce a technically or operationally durable refractory design lining could give rise to premature deterioration of the refractory lining and furnace shell.

The premature failure of the furnace lining will lead to extensive heat losses, furnace bath shift, change in tap hole orientation and alteration of the Pitch Circle Diameter. In this way, the pre-design of refractory lining is very important, we must pay attention to every details, finding out the most suitable refractories for each part.
Our technical team can give you a perfect design which is suitable for your furnaces according to specific needs, please contact us freely if you’re interested.

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:The importance of correct refractory design
Company name: Henan Xinmi Changxing Refractory Materials Co.,Ltd
Email: sales1@chinafirebrick.com
Website:http://www.chinafirebrick.com/

Service Life of Working Layer for Ladle Furnace Designed by Changxing Refractory

Lalde furnace has been widely used in steel refining sector now, as a professional refractory manufacturer, Changxing Refractory has made lots of researches with the purpose of prolonging the service life of ladle furnace for our clients’. Now we would like to share our design for ladles working layer and corresponding service life based on our practical experience.?

The ladle furnace is divided into two types: Non-refining and Refining ladle according to the different output of steel product.?

1.?Non refining ladle, which is mainly applied for carbon steel.?

A. 50-80 heats. Using Alumina-magnesia Spinel brick as working layer. This proposal is specially applied for Ladle with the capacity of less than 50 Tons.?
B. 80-120 heats. Using?Magnesia Alumina Carbon brick?and?Magnesia Carbon brick?.?
C. 80-130 heats. Using Magnesia-magnesia spinel castable.?

2.?Refining ladle, it is mainly applied for producing higher standard steel. Such as alloy steel, stainless steel.?

A. 50-100 heats (Alloy steel application). Using?Magnesia Alumina Carbon brick?, Alumina Magnesia Carbon brick andMagnesia Carbon brick?.?
B. Stainless steel application.
a) 25-35 heats. Using?Low Carbon brick.?
b) 60-90 heats. Using Magnesia Calcium brick or Magnesia Calcium Carbon brick.
c) 120-160 heats. Using Corundum Spinel Castables and prefabricated impact plate at the bottom + Carbon free prefabricated plate at the wall +?Magnesia Carbon brick?at slag line area.??

The aforementioned proposals are actual feedbacks from our clients. It could be variable as per the different production process and refining period. So just tell us your current working situation and capacity of your ladle, Changxing engineers will customized the suitable design for you. With more than 30 years’ experience in refractory sector, Changxing is also available for whole design proposal for EAF, Tundish and Induction furnace etc. Here we are warmly welcome your inquiry or any other technical questions.
The link :http://www.chinafirebrick.com/Company_News_45.html

Open Egyptian Refractory Market with Our Best Sell Product -- Silica Ramming Mass

As per invitation of Egyptian client, our sales manager and engineer went to Egypt on 4th December, 2015, and stay there for 2 weeks. Our client's steel plant is located in Giza city, about 1 hour far from Cairo. Out of space limit, our clients are using 3T induction furnaces now. They built the CCM in October and when our colleagues arrived there, the working condition was still very bad. Considering the heat consumption is very heavy when transporting melting steel from induction furnace to ladle and tundish, temperature of output melting steel should be as high as 1720-1740℃. Sometimes the CCM didn’t work well, keeping melting steel temperature more than 2 hours was very frequent.?

This client bought 24 tons of our silica ramming mass in November. This product is our best sell during the past year 2015, which is mainly designed for induction furnace. When we helped the client do lining for their induction furnace, we could only make the lining thickness as thin as 80/110/200mm. Under this hard condition, our silica ramming mass successfully reached 15 heats. Furthermore, this product is also widely used for building lining of tundish and ladle. If any interests, please don’t hesitate to contact us. Our professional team will give you more details.

Await for your cooperation! if u need any refractory products , you can contact us anytime .waiting for your coming.
The link :http://www.chinafirebrick.com/Company_News_44.html

Reasons of Why Furnace Built with Changxing Refractory Silica Ramming Mass can Get a Long Using Life

Based on our 30 years experience of medium frequency induction furnace ramming, we find that furnace lining materials quality plays an important role in prolonging furnace using life. It has the following aspects to be concerned.

Firstly, the lining materials should have good character.

1. High bulk density stability and high refractoriness under load, not easy to be melt or soften could make materials not easy to lose strength, appear crack and collapse.

2. Its high thermal shock resistance, good cold and high temperature crush strength could protect furnace wall from cracking and spalling well and could resist to steel liquid slag corrosion.

Secondly, the composition of the refractory material should be strictly controlled.

1. The materials impurities could form low melting point compound under high temperature, which will greatly reduces the materials’ refractoriness, meanwhile, the service life of crucible will greatly reduced. 2. For this lining materials, should have following standard: (SiO2):96.0% or higher; (Al2O3) 0.5% or less; (Fe2O3) 0.5% or less; (TiO2) 0.05% or less; (H2O) 0.5% or less. Thirdly, refractory material particle size ratio is the key element. 1. Reasonable ratio of particle size, can be easily formed high density refractory layer for the furnace, which will avoid in defects during using process.

2. Generally it has 3 types: Coarse, medium and fine. Ratio as bellow: 3.35 mm to 5 mm: 17%; 0.85 mm to 1.70 mm: 33%; 1.70 mm to 0.85 mm: 20%, 0.1 mm below: 33%.

Changxing Refractory supplies any customized silica ramming mass, we design products size based on your furnace drawing, should you have any needs or questions, please feel free to let us know!if you want to buy any refractory products ,you can contact us anytime.Our website is http://www.chinafirebrick.com/.
The link :http://www.chinafirebrick.com/Company_News_43.html

How to Make Tundish Nozzle and Well Block Match with Tundish Lining

When choosing silica ramming mass as tundish lining, the expected service life could be 36-60 hours, but the service lives of tundish nozzle well block are not as long, in this case, how to ensure continuous casting? Here are two options:

1. Using normal sizing nozzle and well block. The service life for normal sizing nozzle and well block is only 8-10 hours, under this condition, we need to change the nozzle and well block every 8-10 hours, which is very time and energy consuming and affect continuous casting to a certain extent.

2. Using exchangeable nozzle and well block. The service life of upper exchangeable nozzle and well block is 24-30 hours, which gives longer continuous casting time, we only need to change the lower nozzle, of course every coin has two sides, under this condition, a set of exchanging mechanism is needed, the cost will be comparatively higher.

Users can choose either of those two options according to practical needs.
There are some essential differences between graphite carburant and coal quality carburant:
First: The raw material of those two carburant is different. Graphite carburant is made from filtered natural graphite, and coal quality carburant is produced from burning anthracite.
Second: They have different features. Graphite carburant has features of low sulfur, low nitrogen phosphorus, high temperature resistance and good electrical conductivity etc., which are not available for coal quality carburant.
Third: They have different absorptivities. Absorptivity of graphite carburant is more than 90%, and that’s why it can meet the using requirement even its fixed carbon is low (about 75%).
Forth: Graphite carburant and coal quality carburant have quite different prices. Even the price of graphite recarburant is a little higher than that of coal quality carburant, its comprehensive cost is much lower.

Changxing Refractory has all the refractory products mentioned above, if you need any of them, feel free to email us or call us!
The link ：http://www.chinafirebrick.com/Company_News_42.html

Reasons of Why Furnace Built with Changxing Refractory Silica Ramming Mass can Get a Long Using Life

Based on our 30 years experience of medium frequency induction furnace ramming, we find that furnace lining materials quality plays an important role in prolonging furnace using life. It has the following aspects to be concerned.


Firstly, the lining materials should have good character.


1. High bulk density stability and high refractoriness under load, not easy to be melt or soften could make materials not easy to lose strength, appear crack and collapse.


2. Its high thermal shock resistance, good cold and high temperature crush strength could protect furnace wall from cracking and spalling well and could resist to steel liquid slag corrosion.


Secondly, the composition of the refractory material should be strictly controlled.


1. The materials impurities could form low melting point compound under high temperature, which will greatly reduces the materials’ refractoriness, meanwhile, the service life of crucible will greatly reduced. 2. For this lining materials, should have following standard: (SiO2):96.0% or higher; (Al2O3) 0.5% or less; (Fe2O3) 0.5% or less; (TiO2) 0.05% or less; (H2O) 0.5% or less. Thirdly, refractory material particle size ratio is the key element. 1. Reasonable ratio of particle size, can be easily formed high density refractory layer for the furnace, which will avoid in defects during using process.


2. Generally it has 3 types: Coarse, medium and fine. Ratio as bellow: 3.35 mm to 5 mm: 17%; 0.85 mm to 1.70 mm: 33%; 1.70 mm to 0.85 mm: 20%, 0.1 mm below: 33%.


Changxing Refractory supplies any customized silica ramming mass, we design products size based on your furnace drawing, should you have any needs or questions, please feel free to let us know!if you want to buy any refractory products ,you can contact us anytime.