Flow Steel Bricks
Flow steel bricks refer to hollow refractory bricks that are laid in the grooves of the ingot casting bottom plate to connect the flow steel bricks and the ingot mold, commonly known as runner brick. Mainly used to reduce the resistance of molten steel flow and prevent steel leakage. The main characteristics include high temperature pressure resistance, wear resistance, good fluidity, easy installation and good fire resistance.
1. Classification by material：
(1)Clay: This is the most basic type of flow steel brick, made of ordinary clay. Although the price is low, it is relatively poor in fire resistance and service life, and is suitable for some small steel mills or temporary use scenarios.
(2)High aluminum: This flow steel brick contains a high aluminum content, has excellent fire resistance, and can remain stable in high temperature environments. It is often used in large steel enterprises, especially in steelmaking processes that need to withstand high temperatures for a long time.
(3)Mullite: The surface needle-shaped crystals present a network cross structure, which can effectively prevent erosion by molten steel. It is currently the mainstream material.
2. Classification by functional:
(1)Center Bricks
Used in the core area of molten steel flow, supporting the flow path and requiring high
refractoriness and erosion resistance.
(2)Steel Divider Bricks
Used to divert molten steel to different molds. Common specifications include double, triple, and quadruple holes, depending on process requirements.
(3)Tail Bricks
Located at the end of the steel flow system, they withstand the impact of molten steel and high temperatures and require resistance to fracture.
1. Superior high-temperature resistance
They are capable of enduring the extreme temperature of 1500–1700℃ of molten steel for prolonged periods. Mullite-based casting bricks, for instance, have a refractoriness exceeding 1780℃, making them suitable for high-temperature casting scenarios.
2. Strong erosion resistance
With a dense and high-strength structure, casting bricks can effectively resist the physical scouring caused by the high-speed flow of molten steel, minimizing wear and tear during operation.
3. Excellent corrosion resistance
They can withstand chemical erosion from molten steel and various slags. Different material formulations are adapted to specific working conditions.
4. Good thermal shock resistance
They can tolerate rapid temperature fluctuations during the casting process without cracking or spalling.
5. Low contamination to molten steel
The dense material structure reduces peeling and particle shedding, avoiding the introduction of impurities into molten steel and ensuring the purity and quality of the final steel products.
6. Precise dimensional accuracy
They feature smooth inner channels, regular external shapes, and tight dimensional tolerances. This ensures seamless joints during installation, reduces molten steel flow resistance, and prevents steel leakage risks.
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Clay&High Alumina
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Item
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RBT-80
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RBT-75
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RBT-70
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RBT-65
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RBT-55
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RBT-48
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RBT-40
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Al2O3(%) ≥
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80
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75
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70
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65
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55
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48
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40
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Apparent Porosity(%) ≤
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21(23)
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24(26)
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24(26)
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24(26)
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22(24)
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22(24)
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22(24)
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Cold Crushing Strength(MPa) ≥
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70(60)
60(50)
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60(50)
50(40)
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55(45)
45(35)
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50(40)
40(30)
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45(40)
35(30)
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40(35)
35(30)
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35(30)
30(25)
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0.2MPa Refractoriness Under Load(℃) ≥
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1530
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1520
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1510
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1500
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1450
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1420
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1400
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Permanent Linear Change(%)
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1500℃*2h
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1500℃*2h
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1450℃*2h
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1450℃*2h
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1450℃*2h
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1450℃*2h
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1450℃*2h
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-0.4~0.2
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-0.4~0.2
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-0.4~0.1
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-0.4~0.1
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-0.4~0.1
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-0.4~0.1
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-0.4~0.1
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Mullite
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Item
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JM-70
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JM-62
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Al2O3(%) ≥
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70
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62
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Fe2O3(%) ≤
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1.8
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1.5
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Refractoriness(℃) ≥
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1780
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1760
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Apparent Porosity(%) ≤
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28
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26
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Cold Crushing Strength(MPa) ≥
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25
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25
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Permanent Linear Change(1500℃*2h)(%)
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-0.1~+0.4
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-0.1~+0.4
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Flow steel bricks are primarily used in the bottom casting process, serving as a channel for molten steel to flow from the ladle to the ingot molds, ensuring smooth distribution of the molten steel to each ingot mold.
Core Function
Flow steel bricks, through their hollow interior, ensure directional flow of molten steel, preventing it from directly impacting the ingot molds and minimizing structural failure caused by localized overheating. Furthermore, their refractory properties allow them to withstand the physical impact and chemical reactions of high-temperature molten steel, preventing impurities from entering the steel and affecting its quality.
Shandong Robert New Material Co., Ltd. is located in Zibo City, Shandong Province, China, which is a refractory material production base. We are a modern enterprise that integrates the research and development, production, sales, kiln design and construction, technology, and export refractory materials. We have complete equipment, advanced technology, strong technical strength, excellent product quality, and good reputation. Our factory covers over 200 acres and an annual output of shaped refractory materials is approximately 30000 tons and unshaped refractory materials is 12000 tons.
Our main products of refractory materials include: alkaline refractory materials; aluminum silicon refractory materials; unshaped refractory materials; insulation thermal refractory materials; special refractory materials; functional refractory materials for continuous casting systems.
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