Magnesia chrome bricks are high-performance refractory materials specially designed for the demanding environments of the iron and steel industry. These bricks are made from high-purity magnesite and chrome ore, offering excellent thermal resistance, high refractoriness under load (RUL), and outstanding resistance to slag corrosion and thermal shock.
In steelmaking applications, magnesia chrome bricks are widely used in converters, electric arc furnaces (EAF), ladles, and tundishes, where they provide critical lining protection against aggressive slags and high-temperature operations. They are engineered to prolong the service life of refractory linings and reduce downtime for maintenance.
Technical Specifications
| Item / Grade | MGe-16A | MGe-16B | MGe-12A | MGe-12B | MGe-8A | MGe-8B |
|---|---|---|---|---|---|---|
| MgO, % ≥ | 50 | 45 | 60 | 55 | 65 | 60 |
| Cr₂O₃, % ≥ | 16 | 16 | 12 | 12 | 8 | 8 |
| Apparent Porosity, % ≤ | 19 | 22 | 19 | 21 | 19 | 21 |
| Cold Crushing Strength, MPa ≥ | 35 | 25 | 35 | 30 | 35 | 30 |
| 0.2MPa Refractoriness Under Load, °C ≥ | 1650 | 1550 | 1650 | 1550 | 1650 | 1530 |
Key Features
Superior slag resistance to basic and slightly acidic slags
High refractoriness (≥ 1800°C) and excellent thermal stability
Low thermal conductivity and energy efficiency in furnace operations
Extended service life and reduced maintenance cost
Custom sizes, shapes, and formulations available for specific furnace zones
Typical Applications
Linings for basic oxygen furnaces (BOF)
Electric arc furnace (EAF) hearths and sidewalls
Secondary refining units such as RH degassers and ladles
Tundishes and other metallurgical vessels
Production Details
Our magnesia chrome bricks are manufactured using high-purity fused magnesia and carefully selected chromite materials. The production process includes:
Raw Material Selection: Premium quality magnesia and chromite are selected to ensure chemical stability.
Fine Grinding & Mixing: Materials are ground and homogenously mixed under strict control.
High Pressure Forming: Bricks are shaped by hydraulic press to achieve high density and structural integrity.
High Temperature Sintering: Bricks are fired in high-temperature kilns (over 1700°C) to enhance bond strength and reduce porosity.
Strict Quality Control: Each batch undergoes rigorous inspection to meet international standards, including chemical composition, porosity, strength, and refractoriness.
Packing and Shipping Details
Packaging: Bricks are securely packed in fumigated wooden pallets with plastic wrapping and corner protection to avoid damage during transit.
Unit Weight: Approx. 3.0–4.5 kg/brick depending on size
Shipping: We support international shipping via sea or land freight. Lead time varies based on order quantity, typically within 15–20 days.
Customized Packaging: Available upon request with customer logo and specification label.
Frequently Asked Questions (FAQ)
Q1: What are magnesia chrome bricks used for in the iron and steel industry?
Magnesia chrome bricks are primarily used in high-temperature zones such as electric arc furnaces (EAF), ladles, and converters. Their high thermal resistance and corrosion resistance make them ideal for lining furnaces in steel-making processes.
Q2: What are the main raw materials in magnesia chrome bricks?
The main raw materials are high-purity magnesia (MgO) and chromite (Cr₂O₃), which are fused or sintered to ensure excellent performance in harsh environments.
Q3. Do magnesia chrome bricks contain harmful hexavalent chromium (Cr⁶⁺)?
Our magnesia chrome bricks are manufactured using environmentally controlled processes, with strict control of Cr⁶⁺ levels. We also offer low-Cr⁶⁺ and environmentally friendly formulations upon request.
Q4: What is the typical service temperature range?
These bricks can withstand working temperatures from 1,700°C to over 1,900°C, depending on the specific formulation and application conditions.
Q5: Can I customize the size and composition of magnesia chrome bricks?
Yes. We provide customized brick shapes, sizes, and compositions based on your furnace type and technical requirements. OEM services are also available.
