Introduction
Chromium corundum bricks are composite refractory materials primarily composed of alumina (Al₂O₃) and chromium oxide (Cr₂O₃). By incorporating chromium oxide crystals into the corundum matrix, they form refractory products with excellent erosion resistance. At high temperatures, Cr₂O₃ forms a continuous solid solution with Al₂O₃, giving chromium corundum products superior high-temperature properties compared to pure corundum materials.
The most commonly used chrome corundum products contain 9% to 15% Cr₂O₃. Their main mineral phase is the α-Al₂O₃–Cr₂O₃ solid solution. Refractory bricks with chromium oxide content ranging from 1% to 30% include two types: electrofused chrome corundum bricks and sintered chrome corundum bricks. Typically, "chrome corundum bricks" refers to the sintered type.
Advantages
Superior slag resistance: Cr₂O₃ reacts with components such as CaO and FeO in slag to form high-melting-point solid solutions (e.g., calcium-chromium garnet), which inhibit slag penetration. Resistance to alkaline slags (e.g., steelmaking or gasifier slags) exceeds that of ordinary corundum bricks by over 50%, more than doubling service life.
High-temperature mechanical stability: Exhibits room-temperature compressive strength ≥100 MPa, retaining over 80% of its strength at 1,400°C. Withstands heavy loads and mechanical shocks.
Thermal shock resistance: Can endure 10–15 cycles of water quenching from 1,100°C without cracking, outperforming magnesia-chrome bricks (which are limited due to Cr⁶⁺ pollution risks).
Chemical compatibility: Shows low wettability to steel, iron, and molten non-ferrous metals (e.g., copper, aluminum), and resists corrosion from reducing atmospheres (e.g., CO, H₂).
Zinfon Refractory Technology Co.,Ltd.
We provide one-stop services from technical consultation to design, production, and after-sales support.
Raw Materials
Main materials: Electrofused corundum sand (Al₂O₃ ≥ 95%) and chrome ore sand (Cr₂O₃ ≥ 45%) mixed proportionally, with Cr₂O₃ accounting for 12%–20%.
Additives: Small amounts of MgO (≤2%) serve as sintering aids to promote grain boundary bonding.
Physical and Chemical Specifications
|
Specifications Grade |
GYZ-98 |
GYZ-95 |
GYZ-90 |
GYZ-85 |
|
|
Chemical Composition (%) |
Al2O3 |
98.5 |
95 |
90 |
85 |
|
SiO2 |
0.3 |
3.0 |
9.0 |
18 |
|
|
Fe2O3 |
0.2 |
0.2 |
0.5 |
0.5 |
|
|
Apparent Porosity (%) |
18 |
18 |
18 |
20 |
|
|
Bulk density g/cm3 |
3.0 |
2.95 |
2.9 |
2.75 |
|
|
Cold Crushing strength MPa |
90 |
80 |
80 |
70 |
|
|
Refractoriness under Load(0.2MPa ℃) |
1700 |
1650 |
1650 |
1700 |
|
|
Reheating Linear Change(%)1600°C×3h |
0.1 |
0.2 |
0.2 |
0.3 |
|
|
Item |
Index |
|
|
Chemical Composition % |
Al2O3 |
≥92 |
|
CaO |
≤1.2 |
|
|
SiO2 |
≤1.0 |
|
|
Fe2O3 |
≤0.3 |
|
|
Cr2O3 |
≥3 |
|
|
Na2O |
– |
|
|
ZrO2 |
≥3 |
|
|
Cold Crushing Strength (Mpa) |
≥180 |
|
|
Apparent Porosity (%) |
≤15 |
|
|
Refractoriness (℃) |
≥1900 |
|
|
Modulus of Rupture at High Temperature 1250℃ (Mpa) |
≥9.5 |
|
|
Bulk Density (g/cm3) |
≥3.25 |
|
|
Reheat linear change 1600℃×3h (%) |
≤±0.2 |
|
|
0.2Mpa Refractoriness Under Load T0.6 (℃) |
≥1680 |
|
Process
Isostatic pressing (pressure ≥ 150 MPa) or vibration molding is employed. The green body's density is ≥ 2.9 g/cm³.
Firing occurs at 1750–1850°C, with a soaking time of 10–15 hours, forming an interlocking corundum–chrome corundum microstructure.
Application
Ladle slag line: Resistant to erosion by high-alkalinity slag (R = 3.0–4.5), with a service life 30% longer than magnesia-carbon bricks.
Iron desulfurization furnace: Resistant to CaO–CaF₂ system slag and high-temperature sulfur atmosphere (1350–1450°C).
Coal - water slurry gasifier: Lining resists fly ash scouring and corrosion in a CO–H₂O mixed atmosphere (1400–1600°C).
High - temperature zone retaining bricks: Protect furnace from erosion by glass melts, e.g., at the junction between melting and cooling sections.
Copper smelting furnace: Furnace wall lining resists Cu₂O–FeO–SiO₂ system slag (1200–1300°C).
Why chooes us?
01/Customized dimensions and shapes
-
Customized Brick Shape
Provide Sample Sheets--Mold Opening & Quotation--Mold Opening & Sample Making--Bulk Production Quotation--Contract Signing--Bulk Production
02/Delivery cycle and logistics
-
Sea freight, land freight. Determine the mode of transportation according to the needs
About 30 days, customized products delivery time depends on the actual situation.
03/Customized packaging
-
Customize your brand
Logo customization, custom fonts, taglines and messages for packaging, signage, websites or printed materials.
Take your brand to the next level, contact us today to discuss your project!
04/Purchase ZINFON refractory Bricks at Reasonable Prices
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The price of refractory bricks is a known key factor influencing customers' purchasing decisions. Therefore, we offer affordable refractory bricks for sale. Here are several reasons why ZINFON provides refractory bricks at competitive prices:
Factory price
By collaborating with ZINFON, we ensure that customers enjoy the ex-factory price of refractory bricks, reducing costs from middlemen or distributors. This allows customers to obtain the most cost-effective pricing directly from the source.
Low raw material cost
ZINFON is surrounded by abundant mineral resources. With these high-quality materials, customers can obtain products that are both affordable and excellent in performance.
Mass production
ZINFON possesses advanced production equipment and technologies, enabling the factory to achieve economies of scale and reduce unit production costs. Meanwhile, it ensures a continuous supply of high-quality products at preferential prices.
It is worth noting that while price is an important factor, it should not be the sole determinant of your purchasing decision. When buying refractory bricks from ZINFON, quality, reliability, and technical support are equally important considerations.
By choosing ZINFON as your supplier, you can access high-quality refractory bricks, a wide range of other refractory materials, and comprehensive support. Contact ZINFON Refractories immediately to discuss your specific requirements and obtain customized solutions!
7*24 hours online response
Provide professional after-sales protection
Our address
Qinghua Management Dist., Dashiqiao City, Yingkou City, Liaoning, China
Phone Number
+8613700131695
+8618540210631
info@zinfon-refractory.com
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