Steel Eaf Refractory Well Block and Purge Plug for Ladle Bottom
In steel-making today, gas blowing in a ladle is indispensable for improvement of steel quality and for continuous casting.
SNREF purging plug is characterized by their high strength, good erosion resistance and corrosion resistance, high blowing rate and good safety. They are widely used for continuous casting ladles and refining ladles.
PRODUCT OVERVIEW
Purging plug, being an important element in high temperature refining metallurgy, having been widely used
in many industries, such as iron and steel, ferro alloy, non-ferrous metals etc.
We have more than 20 years production experience in purging plug and housing block, with annual
poduction capacity over 50,000 sets.
For many years, we are in the leading position for researching and producing high quality purging blowing
products in China. According to years experience of on site inspection, we have successfully developped
many types of purging plug, including slit type, segment type(plate type), porous type.
Adopting unique forming workmanship, special maintenance method, high temperature firing technology,
our purging products come with feature of long service life, high blowing rate, safe and reliable.
Our purging products have been widely recognized by domestic and abroad large and medium-sized steel
mills with excellent performance feedback.
PRODUCT TYPE AND PERFORMANCE
With the development of ladle refining technology and ladle lining refractories, higher requirements are
imposed on the blowing rate and lifetime of purging refractories.
In order to meet the metallurgical needs of different steel types and different refining processes (RH, LF, VD,
VOD, VAD, CAS, ANS), we have developed the following series of purging refractories.
-Slot Plug(slit plug)
Slot plug is the most common structure in purging plug.
The gas channel could be designed and customized according to actual on-site using conditions, including refining steel grade,
refining workmanship, ladle capacity, temperature, hydrostatic pressure of liquid steel etc.
This can achieve the best blowing effect for purging plugs, ensure the longest service life, safety, stability and best air
permeability.
2. Material and Chemical Composition
At present, the widely-adopted purging plug is slit type, materials chromite corundum spinel or corundum spinel. The technical
parameter as per below:
1. Adopting high quality materials with good feature of anti liquid steel and slag erosion, in order to ensure the blowing
though performance of purging plug.
2. Through constant research on optimization of matrix composition and production process, ensuring the unifirm structure,
good volume stability, good anti slag penetration and slag corrosion feature, good high temperature strength, in order to
withstand the flushing from high temperature airflow and liquid steel. Our slit plug also comes with excellent thermal shock
resistance, in order to avoid the reduction of air blowing rate caused by latered peeling or fracture under high temperature.
3. The main feature for slit plug is high blowing rate, wide adjustable range of flow rate, easier for operation control during
refining process.
4. By selecting different raw materials and workmanship, we can produce slit plug with flow rate ranges from 12% to 20%, low
temperature/medium temperature/high temperature various type plugs to meet different application conditions.
5. Application characteristics:
Slit plug is the most widely used purging plug in China. Produced by vibration casting and molding of high performance
corundum spinel castable, firing under high temperature, high temperature strength, excellent high temperature erosion
resistance and easy production procedure, with much wider adjustable range of on-site refining operation flow.
-Porous plug
Porous plug has better porosity and permeability.
Production technology is adding carbon-containing compound into mixture, since carbon-containing compound can burn out without
residue at low temperature, so we adopt low temperature burning out intermediate materials to get the initial porosity.
In porous type plug, inside distributes interpenetrating gas channels in different sizes.
When blowing stop, the steel and slag from ladle will infiltrate into the deep areas of the plug, to form a secure layer on working surface.
3.2 Material and Chemical Composition
Porous plug has better porosity and permeability.
Production technology is adding carbon-containing compound into mixture, since carbon-containing compound can burn out
without residue at low temperature, so we adopt low temperature burning out intermediate materials to get the initial porosity.
In porous type plug, inside distributes interpenetrating gas channels in different sizes.
When blowing stops, the steel and slag from ladle will infiltrate into the deep areas of the plug, to form a secure layer on
working surface.
3.3 Application characteristics:
3.3.1 Resistant to slag
In order to increase resistance ability to slag and liquid steel penetration, Cr2O3 or chromium corundum is always added into
corundum spinel. Cr2O3 has the same crystal structure with a-Al2O3, the adding of Cr2O3 can effectively
improve the slag resistance ability of materials, also can improve the gas channel blocking condition caused by liquid steel
penetration.
The aluminum-chrome solid solution and independent chrome-bearing glass phase which were formed by Cr2O3 fine powder
and Al2O3 under high temperature, can form into liquid phase with certain viscosity, when meet with the slag in steel smelting
process. This liquid phase can avoid the slag erosion to porous plugs, and also absorb
the Iron oxide and magnesium oxide, forming dense spinel on plug's working surface, thus further improve the slag resistance
of the plug.
3.3.2 Thermal shock resistant
The main damage to porous plug is thermal shock. As the tapping temperature increasing, there existing big temperature gap
onto working surface during work and break. After introducing spinel phase into the structure, the thermal resistance of
purging plug is increased significantly.
The oxide and non-oxide added into porous plug will form into solid solution phase with aggregate under high temperature,
which will increase the high temperature strength, air permeability, resistance to slags of the plug.
After high temperature burning for the plug, the performance is increased to meet different steelmaking conditions.
-Segment Plug
The segment plug is preferably made of good anti-stripping materials, the block body is not easy to occur fracture, with longer service life. The cracks between different plates will not expand, so this segment plug design can avoid failure of bottom blowing caused by tranverse brick fracture.
Application characteristics: In order to adapt to more and more strict refining conditions(especially special steel), and to meet the requirements of increasing ladle life, the volume of plug becomes bigger and bigger. However the traditional slit type plug has single material and single structure, easy to cause the phenomenon of tranverse fracture and failure of air blowing. Our researched segment plug has successfully soved the problem of fracture existing in traditional slit plug. Significantly increasing the stability of refining process, ensuring the realization and improvement of quality refined steel.
Compared with traditional slit plug, our sgement plug obtains below advantages:
-1 Simultaneous improving the plugs' thermal shock resistance and erosion resistance.
-2 The design of segment(plate) and compsition structure obtains good thermal conductivity and low stress characteristic,
significantly increase the air blowing rate.
-3 Stable flowing rate, good blowing through performance, higher stability in refining process operation.
-4 Almost no fracture layer, reducing the labour strength during oxygen cleaning of plugs after casting.
-5 Lifetime much increased, synchronized with the slag line.
Picture 3 shows the comparison on thermal stress between slit type plug and segment plug.
Conclusion: After argon blowing finishes, the max thermal stress for slit type is 356.55MPa, while thermal stress for segment plug
is significantly reduced to 111.93MPa, stress reduced 69%.
The thermal stress for slit and segment plug is equally the same after heating and steel tapping finishes, but after argon blowing, the
structure of segment composite type is much better than slit type plug.
Corundum-Mullite Corundum-Spinel Corundum-Spinel
-Hybrid Plug
Secondary refining technology is the most important part in steelmaking process
It can adjust the steel alloy type and liquid temperature.
Purging plug and block is the key functional component to make this process carried out.
As the ladle tends to develop in larger scale, the melting temperature and time have been improved significantly, which makes the
using environment for refractory materials more and more strict. Therefore, it is necessary to further improve the performance of
purging plugs and blocks to meet the increasing demands in current steelmaking technology
-Overall breathable brick:
This product adopts high purity raw materials, through vibration casting and low temperature heating process workmanship.
Function is blowing argon gas via purge plug to ladle.
With the feature of high strength, good thermal stability, erosion resistance and abrasion resistance.
Widely used in steel plants LF, LF-VD, CAS-OB refining ladle
We manufacture various high-quality ladle refractory according to the clients' needs , and to ensure the stability and accountability of the quality.
Technical data will be customized according to your steel making condition.
| Chemical and Physical Properties |
SNLWB-85 |
SNLWB-90 |
SNLWB-95 |
| Al2O3 +MgO % min |
85 |
90 |
95 |
| Cr2O3 (C) % min |
0 |
2.5 |
2.5 |
| Apparent porosity g/cm3% max |
15 |
13 |
13 |
| Bulk density g/cm3 % min |
3.0 |
3.05 |
2.9 |
| Normal temperature Compressive strength (MPa) min |
80 |
100 |
100 |
| Breaking strength 1500°C×3hmin |
23Mpa |
2.Well block and segment plug
| Chemical and Physical Properties |
(Well block) |
(purging plug) |
| AL2O3 % |
>=85 |
>=85 |
| MgO% |
3-5 |
1-3 |
| Cr2O3 % |
----- |
>2.4 |
| Bulk density g\cm3 |
>=3.0 |
>=2.9 |
| Apparent Porosity % |
<=16 |
<=18 |
| Cold crushing strength Mpa |
110ºC*24h |
>=60.0 |
>=80.0 |
| 1500ºC*3h |
>=100.0 |
>=80.0 |
| Refractoriness under load : ºC |
>=1680 |
>=1680 |
| Modulus of rupture 1400ºC *1h Mpa Mpa |
>=15.0 |
>=15.0 |
| Linear change 1500ºC*3h % |
±0.2 |
±0.2 |
| air permeability, m3/hour at P=4 bar |
30M3/H |
Product packaging
1- International standard seaworthy exportable packing.
2- Wooden pallet.
3- Wooden / bamboo case (box).
4- Further packing information will be based on customer's requirements.
Shandong Sinorefractory New Materials Co.,Ltd (SinoRefractory)has been focusing on international marketing of flow control refractories in iron and steel industry for 17 years.
SinoRefractory is the second generation of refractories export enterprise developed out of EMEI Group.Supported by one of China's largest production bases in functional refractory materials.
Through years of development in the field of exporting top quality refractories to worldwide markets,SinoRefractory aims at researching,producing,marketing and exporting high standard Ladle slide gate plate,Ladle Nozzles,Well blocks,Purging plugs,Nozzle stuffing sand,Refractory castables, Slide gate Mechanisms etc.
Up to now,SinoRefractory has supplied high quality refractory products and services to nearly 70 top-hundred global steel enterprises.
SinoRefractory will always put clients'interest in the first place,striving to provide a wide range of services,including technical solution,pre-sales support,after-sales services,installation team support,professional know-how according to the changing of steelmaking condition,etc.
We are not only selling products,we are more focused on supporting,developing and growing together with clients.
Our Advantages of SNREF Ladle Gas Purging System Purge Plug Set Block for Steel Melt Refining
Wear resistant materials to cope with high local turbulence and with consistent dimensional control to fit the purge plug.
Purge Plugs:
* Uni or omnidirectional, porous or with slots, several designs
* Large material portfolio to select with our specialists
Plug and Block Assemblies (PBA) reduce your installation challenge and risk.
Below are some RFQ and answers about ladle and tundish flow control refractories:
Q: What are the requirements for refractories for ladle?
A: The requirements of refractories for ladle mainly include:
* high temperature resistance
* thermal shock resistance
* resistance to the erosion of the slag
* high temperature with sufficient mechanical strength
* the lining has a certain degree of expansion
Q:What are the reasons for the destruction of refractories for ladle?
A: The main causes of damage are as follows:
When the ladle transports high-temperature molten steel, the high-temperature molten steel and slag at about 1680ºC scour and erode it, especially in the slag line part, the scouring and erosion is more serious, and it is an important factor to decide the service life of the ladle.
LF and other extra-oven refining treatment on the unburnt brick damage is serious.
Q:What steel grades are different materials of slide plate bricks suitable for respectively?
A: Different materials of slide plate bricks are applicable to different steel grades. For example,
Al2O3-ZrO2-C slide gate plate can be used as ladle sliding gate plate due to its excellent erosion resistance and thermal shock stability, which can adapt to the casting of various steel grades, and ther are the following materilas based on customer's steel making condition: the MgO-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, MgO-Al-C, and so on.
For more details, feel free to send inquiry to us.
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