Description

Anchor bricks are mainly used in the roofs and walls of industrial furnaces. They are embedded in refractory castable linings and, after proper drying and baking, form an integral structure that enhances the overall stability and performance of the refractory lining.

According to the manufacturing process, anchor bricks can be classified into two types: semi-dry pressed and vibration-cast products. After high-temperature firing, they exhibit high mechanical strength, excellent thermal shock resistance, and strong resistance to spalling.Industrial furnace and flue wall structures generally consist of an inner refractory lining, an insulation layer, and an outer wall layer. The inner lining is typically constructed with refractory bricks, while the outer wall is made of ordinary fired bricks. Anchor bricks serve to connect and secure these structural layers, ensuring the stability of the lining system.

The specially designed ribbed anchoring structure significantly improves tensile and flexural strength. Stress generated at the grooves is effectively blocked by the ribs, preventing further transmission and reducing the risk of structural damage. As a result, anchor bricks with this structure exhibit excellent resistance to breakage and long service life.

Brand Project	Clay Bricks	High Aluminum
Brand Project	FB42-L	AL55	AL60	AL65	AL75	AL80	AL85	CBP80
Al₂O₃ %	≥42	≥55	≥60	≥65	≥75	≥80	≥85	≥80
Fe₂O₃ %	≤2	≤2.0	≤2.0			≤1.5		≤1.5
Fire Resistance℃		≥1790	≥1790	≥1790	≥1790	≥1810	≥1810	≥1810
Reheating Linear Change Rate %	1350℃×2h ±0.2	1500℃×2h ±0.5	1500℃×2h ±0.5	1500℃×2h ±0.5	1500℃×2h ±0.5	1550℃×2h ±0.5	1550℃×2h ±0.5	1550℃×3h ±0.5
Apparent Porosity %	≤23	≤24	≤23	≤23	≤23	≤22	≤20	≤18
Bulk Density g/cm³	≥2.15	≥2.25	≥2.35	≥2.40	≥2.65	≥2.7	≥2.75	≥2.8
Room Temperature Compressive Strength MPa	≥35	≥35	≥40	≥40	≥50	≥55	≥60	≥100
Load Softening Temperature ℃	T₂≥1450	≥1450	≥1470	≥1480	≥1500	≥1500	≥1520	≥1450
Flexural Strength at Room Temperature MPa						≥14	≥14	≥20

●High Strength from High-Temperature Sintering

After high-temperature sintering above 1500 °C, the anchor bricks achieve a uniform and dense structure. They exhibit a room-temperature compressive strength of ≥50 MPa and maintain a strength retention rate of over 85% at 1200 °C, significantly exceeding the performance standards of ordinary refractory bricks.

This high structural strength enables the anchor bricks to firmly support the furnace lining, resist mechanical stress, and maintain the long-term stability of the kiln structure.

●Excellent High-Temperature Resistance

Manufactured from high-quality raw materials such as high-alumina bauxite and corundum, the anchor bricks feature an Al₂O₃ content of up to 75%, a refractoriness of 1790–1810 °C, and a load softening temperature of ≥1500 °C under 0.2 MPa.

These properties enable the bricks to withstand the extreme temperatures encountered in industrial furnaces used in metallurgy, coal chemical processing, and glass production, effectively resisting softening and deformation while maintaining the structural stability of the furnace lining and extending the service life of the kiln.

●Good Thermal Shock Resistance

With an optimized particle size distribution and dense microstructure, the anchor bricks feature a coefficient of thermal expansion ≤ 5.5 × 10^-6 / °C.

After undergoing thermal shock testing at 1100 °C with room-temperature water cooling, the bricks can withstand more than 50 cycles without damage, demonstrating excellent resistance to temperature-induced cracking. This makes them well suited for kilns operating under intermittent conditions or frequent temperature fluctuations.

●Strong Spalling Resistance

The dense sintered structure effectively resists slag and gas penetration as well as chemical erosion. Its thermal expansion coefficient is well matched with that of the furnace lining materials, which helps reduce interfacial stress during temperature fluctuations.

As a result, the anchor bricks exhibit excellent resistance to spalling and maintain a stable bond with the lining structure, thereby reducing maintenance frequency and lowering long-term replacement costs.

product-1594-753

1.When laying the bricks, carefully apply refractory mortar to both sides to prevent gas leakage from the furnace roof.

2.The roof bricks should be laid in accordance with the specified mortar joint thickness, and the metal hanging components must be correctly positioned.

3.The hanging sections of the anchor bricks must not be damaged during installation.

4.Air-hardening refractory mortar is generally recommended for installation.

5.An appropriate expansion joint should be reserved between the furnace body and the anchor bricks to accommodate thermal expansion.

Anchor bricks are widely used in industrial furnaces and kilns across industries such as metallurgy, chemicals, building materials, and power generation. They serve as key components for anchoring and connecting refractory linings, ensuring the structural stability and reliable operation of the furnace.

Typical applications include:

Anchoring systems for refractory castable linings in industrial furnaces and kilns

Boiler furnace walls, flues, and cyclone separators in power plants

Preheaters and decomposition furnaces in the cement industry

Heating furnaces and heat treatment furnaces in the metallurgical industry

Refractory lining structures in petrochemical and chemical processing plants

Q1: What are the differences between anchor bricks and metal anchors?
A: Anchor bricks offer excellent high-temperature resistance and oxidation resistance, making them suitable for long-term service in high-temperature environments. Metal anchors, on the other hand, are generally used in localized areas or medium- to low-temperature zones where structural support is required.

Q2: Can anchor bricks be used together with metal anchors?
A: Yes. In some furnace designs, anchor bricks and metal anchors are used in combination to enhance the overall stability of the refractory lining. The specific configuration should be determined according to the furnace structure and operating conditions.

Q3: Are anchor bricks necessary for furnace linings?
A: For large-area refractory castable linings, the use of anchor bricks is strongly recommended. They help improve structural stability, reduce the risk of lining detachment, and extend the service life of the furnace lining.

Q4: What materials are commonly used for anchor bricks?
A: Common materials include high-alumina and clay-based refractory materials. The appropriate type should be selected according to the operating temperature, lining thickness, and type of refractory castable.

Q5: Do you support customization?
A: Yes. Customized anchor bricks can be produced according to the furnace type, dimensions, and specific operating conditions.

Hot Tags: anchor bricks, China anchor bricks manufacturers, suppliers, factory, 60 Self flowing Castable

Anchor Bricks