1QC 2QC Ladle refractory sliding gate plate for steel making
In the steel making process, the sliding gate plate nozzle system at the bottom of the ladle, consisting of slide gate plate, upper nozzles, lower nozzles, and seating well block,
works in concert to ensure the safe and precise control of molten steel pouring.
There are several key slide gate plate types:
1. Unfired alumina carbon slide gate plates.
2. High-temperature deep-burnt alumina zirconia carbon slide plates.
3. MgO Spinel Slide Plates for high-calcium content steel alloy.
Moreover, pre-assembly slide plate with collector nozzle are provided following customer's drawings.
Below is a detailed explanation of their collaborative processes and functions:
1. Functions and Structures of Each Component
Component
Role Material and Characteristics
Well block Backing Brick, Embedded in the bottom of the ladle, it fixes the upper nozzle and provides a supporting structure.
High-alumina or magnesia-carbon materials, resistant to high-temperature erosion.
Upper Nozzle, Directly contacts molten steel and guides it into the sliding nozzle system.
Aluminum-carbon or zirconium-carbon materials; the inner hole is flared to reduce turbulence.
Sliding Gate Plates, Controls the flow rate of molten steel through horizontal movement
(flow is regulated by misaligning the upper and lower slide gate plate),
Composite refractory materials (such as Al2O3 - C), with an anti-stick coating on the surface.
Lower Nozzle, Guides molten steel from the slide gate plate to the tundish or mold;
some designs allow for disassembly and replacement.
Resistant to rapid heating and cooling, often containing ZrO2 to enhance erosion resistance.
2. Collaborative Workflow
(1) Closed State (Preparation Phase)
Slide gate plate Position: The molten steel flow holes of the upper and lower slide gate plate are completely misaligned, blocking the passage of molten steel.
Sealing Assurance: Hydraulic or spring mechanisms press the slide gate plate tightly to prevent molten steel leakage.
Preheating Treatment: Baked to a temperature of over 1000°C before use to avoid blockages caused by solidified steel.
(2) Pouring Initiation Phase
Slide gate plate Movement: The lower slide gate platemoves slowly to partially align the holes of the upper and lower slide gate plate. Molten steel flows out through the upper nozzle, slide gate plate holes, and lower nozzle.
Flow Control: The flow rate is controlled by adjusting the displacement of the slide gate plate (for example, 50% alignment) to avoid turbulence and splashing.
(3) Pouring Process
Dynamic Adjustment: The opening of the slide gate plate is fine-tuned in real-time according to the tilting angle of the ladle and the requirements of the billets.
Anti-blocking Design: The flared structure of the upper nozzle reduces impurity accumulation; argon blowing in the lower nozzle prevents the formation of nodules.
(4) Closing Phase
Quick Cut-off: At the end of pouring, the slide gate plate are quickly and completely misaligned to cut off the flow of molten steel (to avoid slag carryover).
Emergency Measures: In case the slide gate plate get stuck, the backup hydraulic system or a manual wrench is used to force them to close.
3. Key Points of Coordination Sealing
The slide gate plate need to maintain high-pressure close contact (usually > 10MPa) to prevent the penetration and erosion of molten steel.
Refractory mortar is used to fill the gap between the backing brick and the upper nozzle to avoid molten steel leakage.
Refractory Material Matching
The thermal expansion coefficients of the upper nozzle, slide gate plate, and lower nozzle need to be similar to prevent cracking at high temperatures.
The surface of the slide gate plate is often coated with boron nitride (BN) to reduce the adhesion of molten steel.
Maintenance and Replacement
Backing Brick: It has a relatively long service life (about 100 - 150 pourings), but regular inspection for erosion is required.
slide gate plate/Nozzles: Replaced every 1 - 8 heats lifespan service life pourings to avoid the risk of perforation.
SNREF Slide Gate Plate adopts High quality bauxite material , also takes tabular alumina, carbonaceous material and zirconia-containing material as main raw materials, adds in high performance antioxidants, uses phenolic resin as binder, formed under high-pressure and burned under high temperature. The slide plates have the advantages of high strength, good erosion resistance, thermal shock resistance and good stability etc., mainly used in large and medium-sized ladle.
Main types of slide gate plate
1) C series Small size Slide Plate---mainly for Indonesia, Vietnam, Myanmar, Thailand, for 5-20 tons ladles.
2) QC series Slide Plate mainly for India, Turkey,Middle East, Indonesia, Pakistan, Italy , mainly for 20-30 tons ladles.
3) B250 , safllow, HB250, Mainly for Pakistan, Middle East market.
4) Flocon sereis Slide Plate mainly for Turkey, Middle East, Italy, Braizl, and soon.
5) CS Serise Slide Plate mainly for Europe countries. mostly for larges ladles such as more than 120 tons.
Type of production design
1) High Temperature Burnt Slide Gate Plate and ladle nozzle system
High performance ladle slide gate plate refractories adopts tabular alumina,carbonaceous material and zirconia-containing material as main raw materials, adds in high performance antioxidants, uses phenolic resin as binder, formed under high-pressure and burned under high temperature. Mainly used in large and medium-sized ladles.
2) Low Temperature Burnt Slide Gate Plate and nozzle system
Tabular alumina, zirconia-containing material and spinel as major raw materials, adding in special metal, using phenolic resin as binder, being burned under low temperature to produce the products, Mainly used in small and medium-sized ladle.
3) Un-burned Slide Gate Plate and nozzle system
Without the process of burned, tar impregnated and distilled, simple processing. Mainly used in small and medium-sized ladle.
| Chemical and Physical Properties |
Ladle Slide Gate Plate (General) |
| Magnesia material |
Al-C |
Al- Zr-C |
| apparent porosity % max |
10 |
8 |
8 |
| Bulk Density g/cm3 min |
3.0 |
3.05 |
3.1 |
| Compressive strength MPa min |
120 |
120 |
120 |
| Al2O3 % min |
8 |
85 |
85 |
| ZrO2 % min |
|
|
4 |
| C % min |
3 |
3 |
3 |
| MgO % |
65 min |
|
|
| Service Life heats |
1-2 |
1-3 |
1-5 |
Service Result for slide gate plate and nozzle system:
Service life depends on many points:
1)Different Raw Material,
2)Production Process(Firing temperature, oil immersion, drying temperature...)
3)Steel type
4)Steel making condition
5)Different operation mode
And so on....
1QC Ladle Slide Gate Plate with Collector Nozzle
The slide plates have the advantages of high strength, good erosion resistance, thermal shock resistance and good stability etc.,mainly used in large and medium-sized ladle
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.
Ladle Refractory Slide Gate Plate in Steel Mill Pant, for flow control the steel molten.
Below are some FAQ 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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