Magnesia Refractory Brick

Magnesia refractory brick has a melting point above 2800°C. They provide excellent resistance to basic slags. These bricks offer high mechanical strength. They deliver stable performance in the world’s most demanding furnace environments. These environments include BOF converters, electric arc furnaces, cement rotary kilns, and glass regenerators. REBO is a direct manufacturer with 280,000 tons of annual capacity. We perform full in-house quality testing. We supply the complete range of magnesia brick grades. Our products match your exact application requirements.

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91-97.5%

MgO Content

7-35

Days Delivery

ISO/CE/SGS

Certificates

1560-1700℃

Refractoriness Under Load

Solutions for REBO Magnesia Refractory Bricks

Application-specific Expertise

Solutions are tailored to each use case (converters, ladles, rotary kilns), accounting for slag composition, tapping frequency, and thermal load.

End-to-end Technical Support

From initial specification to on-site guidance, backed by direct factory supply and rigorous batch-level quality control.

Measurable Operational Value

Engineered lining strategies deliver longer campaigns, reduced downtime, and lower total refractory costs per heat.

Specification of Magnesia Refractory Bricks

Ordinary magnesia bricks are produced by crushing and grading high-purity sintered magnesia clinker, mixing and pressing into shape under high pressure, then firing at temperatures between 1550°C and 1650°C in a tunnel kiln to form a dense, direct-bonded periclase structure. Please see the following chemical and physical specifications of refractory fire bricks.

Besides, the standard size is 230*114*65mm. T series are also popular shapes for customers to choose.

Item		M-98	M-97A	M-97B	M-95	M-91
MgO, %	≥	97.5	97.0	96.5	95.0	91.0
SiO2, %	≤	1.00	1.20	1.50	2.00	/
CaO, %	≤	/	/	/	2.00	3.00
Apparent Porosity, %	≤	16	16	18	16	18
Bulk Density, g/cm³	≥	3.00	3.00		2.95	2.90
Cold Crushing Strength, MPa	≥	60	60		60	60
0.2MPa Refractoriness Under Load, ℃	≥	1700	1700		1650	1560
Permanent Linear Change, %		1650℃*2h -0.2~0			1650℃*2h -0.3~0	1600℃*2h -0.5~0

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Mgo Bricks Types for High-temp Solutions

By Chemical Composition

Magnesia Carbon Brick

MgO ≥85% + graphite C 8–20%;

Non-wetting to slag;

Temperature Up to 1750°C;

Used for BOF/EAF lining, steel ladle slag line, etc.

Magnesia Chrome Brick

MgO 60–80% + Cr₂O₃ 8–18%;

Excellent corrosion resistance against basic slag;

Temperature: 1650–1800°C;

Used for Non-ferrous smelting furnaces, cement kilns, etc.

Magnesia Alumina Brick

MgO ≥80% + Al₂O₃ spinel 5–10%;

Superior thermal shock resistance vs. plain magnesia;

Temperature: 1600–1800°C.

Used for Cement rotary kiln burning zone, steel ladle, etc.

Magnesia Silica Brick

MgO + SiO₂ → forsterite (2MgO·SiO₂);

High softening temperature under load;

Temperature: 1500–1650°C;

Used for Open-hearth regenerator, regenerators;

Alumina Magnesia-Carbon Bricks

Al₂O₃ 70–80% + MgO 8–15% + C 5–10%;

Oxidation resistance and thermal shock resistance;

Temperature up to 1750°C;

Used for ladle slag line, ladle wall lower section, ladle bottom;

By MgO Content

Standard Magnesium Bricks

MgO 85–91%;

Composition: Sintered magnesite, periclase main phase;

Good resistance to basic slag;

Temperature: 1500–1600°C;

Used for open-hearth furnaces, non-ferrous smelting, etc.

High-Purity Magnesium Oxide Bricks

MgO ≥95%;

Composition: High-purity sintered magnesia;

Higher refractoriness and hot strength than standard grade;

Temperature: Up to 1750°C;

Used for BOF/EAF linings, cement kiln burning zone, etc.

$Fused Magnesite Refractory Bricks$

Fused Magnesite Refractory Bricks

MgO ≥97%;

Composition: Electro-fused magnesia;

Superior corrosion and slag penetration resistance;

Temperature: Up to 1800°C;

Used for BOF/EAF, refining furnaces (LF/VD/RH), etc.

Magnesia Bricks Properties

Extremely High Refractoriness
With a melting point exceeding 2800°C, magnesia bricks maintain structural integrity under continuous extreme heat, no deformation, no softening, no failure.
Outstanding Resistance to Basic Slag
Magnesia can absorb large quantities of divalent iron oxide in solid solution at 1700°C without melting, making magnesia brick the material of choice wherever basic slags and iron-rich environments are present.
High Mechanical Strength at High Temp
Hard-fired magnesia bricks form direct solid-solid bonding within their microstructure, delivering high strength at elevated temperatures, capable of withstanding molten metal scouring, mechanical loads, and gas flow erosion.
High Thermal Conductivity
Magnesia brick ranks among the highest in thermal conductivity of all refractory materials, second only to carbon and silicon carbide bricks. This promotes even heat distribution and reduces the risk of localized hot spots.

Excellent Volume Stability
Low linear change rate at high temperatures means minimal expansion or contraction over long service cycles to maintain size accuracy and structural integrity.
Excellent Alkaline Resistance
As an alkaline refractory material, magnesia brick is fully compatible with basic slag environments and will not undergo the accelerated chemical dissolution that affects acidic or neutral refractories under the same conditions.
Relatively Poor Thermal Shock Resistance
Thermal shock resistance is a known weakness of standard magnesia brick when a liquid phase forms at high temperature, sudden shrinkage can occur. This is typically addressed by introducing composite phases such as graphite or spinel.
Moisture Sensitive
Despite being fired at high temperatures, magnesia bricks retain a degree of hydration susceptibility. Waterproof storage and careful handling during transport are essential to preserve product integrity before installation.

Magnesite Bricks Applications Across Industries

$Magnesia Refractory Brick for the Steel Industry$

Magnesia Bricks for the Steel Industry

Magnesia bricks line key equipment in iron and steel metallurgy.

In BOFs, they protect the working layer and tap hole from basic slag and thermal shock with refractory castable.

They shield hot spots on walls and roofs from arc heat and slag attack in EAFs.

In ladles and refining furnaces, they reinforce the slag line and wall layer against molten slag erosion.

They strengthen tuyeres, hearths, iron notches, and slag notches under extreme thermal and chemical stress in blast furnaces.

$Magnesia Refractory Brick for Cement and Lime Kilns$

Magnesia Bricks for Cement and Lime Kilns

In rotary kilns used for cement and lime production, magnesia bricks are the material of choice for the sintering zone and transition zone the highest temperature sections where clinker formation occurs and thermal cycling is most intense.

They are also applied in the burning zone lining and kiln inlet/outlet areas, where alkali-rich atmospheres and mechanical abrasion from clinker movement place additional demands on refractory performance over extended campaign periods.

$Magnesia Refractory Brick for Glass Kilns$

Magnesia Bricks for Glass Kilns

In glass melting furnaces, magnesia bricks are widely used in regenerator checker brickwork and the upper regenerator chamber walls, where temperatures reach up to 1,750°C. They are also applied in the port necks and flue gas passages, where alkali vapour condensation and thermal cycling combine to accelerate lining degradation in conventional materials.

$Magnesia Refractory Brick for the Non-Ferrous Metals Industry$

Magnesia Bricks for the Non-Ferrous Metals Industry

In copper smelting furnaces and lead-zinc furnaces, magnesia bricks line the working layer, sidewalls, and tuyere zones of the vessel, providing reliable protection against highly corrosive molten metal and slag.

They are also used in the converter lining and anode furnace walls within copper refining circuits, where oxidising atmospheres and frequent tapping cycles demand consistent lining integrity.

$Magnesia Refractory Brick for the Chemical and Petrochemical Industry$

Magnesia Bricks for the Chemical and Petrochemical Industry

In recovery boilers, gasification reactors, and waste incineration kilns, magnesia bricks are applied in combustion chamber linings, slag discharge zones, and high-temperature wall areas where alkali-laden gases, molten slag, and reactive chemical streams create aggressive corrosive conditions. Their strong resistance to basic attack and high refractoriness make them a dependable choice for protecting structural integrity across the full range of chemical and petrochemical high-temperature process environments.

Certifications That Simplify Global Procurement

REBO holds ISO 9001, ISO 14001, ISO 45001, and CE certifications, and provides a full third-party test report plus an independent inspection video for every shipment. Our quality system is built to exceed the magnesia brick supplier qualification standards of global industrial leaders. Beyond compliance, REBO offers a full traceability code on each pallet, and a dedicated technical engineer for onsite installation support. Your procurement team and engineers receive everything they need certificates, test data, visual evidence, and after-sales backup from day one.

Built to Perform, Direct from REBO Factory

Strong Factory

Behind every magnesite refractory brick we supply is a manufacturing operation built for consistency, capacity, and precision.

Our facility spans over 70,000 square meters with an annual output of 280,000 tons, supported by two 168-meter tunnel kilns and 140 kiln cars running under full PLC automated control. This isn’t just scale. It’s the infrastructure that ensures every brick leaving our facility meets the same thermal, chemical, and mechanical standards, batch after batch. The factory magnesite bricks price is also help you to save cost.

Magnesia Bricks Solution

But production capacity alone doesn’t solve your problem. What matters is whether the right brick ends up in the right part of your furnace.

That’s why we work with each customer to understand their specific operating conditions, including working temperature, slag chemistry, thermal cycling frequency, and furnace structure, before recommending a grade. Whether you need MgO-C bricks for a converter slag line, or high-purity fused magnesia bricks for a secondary refining furnace, we match the product to the environment, not the other way around.

Note: See more solutions on REBO Pinterest.

FAQs About Magnesia Refractory Bricks

Q: How Do I Select the Right Grade of Magnesia Brick for My Application?

A: Selection depends on operating temperature, slag composition (especially FeO and CaO content), mechanical stress, and thermal shock frequency. High-purity or magnesia-carbon grades suit steel converters; sintered or fused magnesia suits rotary kilns and ladles.

Q: How is Quality Consistency Ensured Across Magnesia Brick Batches?

A: REBO, as suppliers, conducts batch-level testing covering bulk density, cold crushing strength, refractoriness under load (RUL), and chemical composition ensuring every delivery meets the same performance standard.

Q: What Technical Support Should I Expect from A Magnesia Brick Supplier?

A: Beyond product supply, a capable supplier should offer application consultation, lining design recommendations, on-site installation guidance, and post-campaign analysis to continuously improve performance.

Q: What Causes Premature Wear or Failure in Magnesia Refractory Brick Linings?

A: Common causes include thermal shock from rapid temperature changes, mechanical impact during charging, chemical attack from aggressive slags, and improper installation. A combined approach of material selection, lining design, and operational discipline addresses most failure modes.

Q: What is the Typical Service Life of A Magnesia Brick Lining?

A: Service life varies by application — converter linings may last 200–500 heats, while ladle or kiln linings depend on slag aggressiveness, tapping frequency, and thermal cycling. Proper material selection and lining design are key to maximizing campaign length.