Magnesia Carbon Bricks – Premium Refractory Lining for Modern Steelmaking

Magnesia Carbon Bricks – Premium Refractory Lining for Modern Steelmaking

High Performance Magnesia Carbon Bricks (MgO-C Bricks) for BOF, EAF & Steel Ladle Slag Line

Meta Description

We supply premium magnesia carbon refractory bricks with high slag resistance & thermal shock stability. Custom carbon content & special shapes for steel converters, electric arc furnaces, ladles and refining furnaces. Factory direct supply, ISO certified.

1. Product Overview

Magnesia carbon brick, also known as MgO-C brick, is an unburned carbon composite refractory. It is produced with high-purity fused magnesia, premium flake graphite, modified phenolic resin binders and composite anti-oxidant additives including aluminum, silicon, magnesium and boron carbide. Magnesia raw material delivers ultra-high refractoriness with a melting point up to 2800°C and outstanding resistance to alkaline slag corrosion. Graphite brings low thermal expansion, high thermal conductivity and non-wettability against molten slag. The perfect combination solves the critical defect of pure magnesia bricks, which are poor in thermal shock resistance. For this reason, magnesia carbon bricks have become the mainstream lining material for steel mills worldwide. Compared with common magnesia bricks and magnesia stone bricks, magnesia carbon bricks can withstand sharp temperature changes, strong scouring from molten steel and long-term slag infiltration. They effectively extend furnace service life, reduce maintenance shutdown time and cut overall refractory replacement costs for steel enterprises.

2. Core Product Advantages

Excellent Resistance to Slag Erosion and Penetration

The high-magnesia matrix resists chemical corrosion caused by high-basicity steel slag. Graphite repels molten slag from seeping into brick bodies, protecting the furnace lining structure, especially the critical slag line area of steel ladles.

Superior Thermal Shock Stability

High thermal conductivity quickly disperses internal thermal stress. The bricks will not crack, peel or spall under frequent heating and cooling cycles inside converters and electric arc furnaces.

Stable High-Temperature Mechanical Strength

Products are shaped by high-pressure hydraulic pressing to achieve dense texture. They feature high cold crushing strength and steady strength under ultra-high temperatures, capable of enduring impact and abrasion from liquid metal.

Reliable Anti-Oxidation Capacity

We adopt customized composite anti-oxidant formulas to slow graphite oxidation in high-temperature oxidizing environments. The bricks maintain stable volume and long service cycles during continuous production.

Customizable Formulas and Shapes

We adjust carbon content ranging from 6% to 20% and magnesium oxide purity based on actual smelting working conditions. Besides standard rectangular bricks, we produce special prefabricated shapes for impact zones, tap holes, trunnion areas and converter mouths.

3. Wide Application Fields

Magnesia carbon bricks are developed to fit harsh high-temperature steelmaking environments and cover all common metallurgical furnaces.

1. Basic Oxygen Furnace (BOF)Whole furnace lining including furnace barrel, trunnion zone, furnace mouth, slag line and tapping impact area.
2. Electric Arc Furnace (EAF)Side walls, hot spots, furnace bottoms, tapping channels and lower roof linings.
3. Steel Ladles and TundishesSlag line, molten steel impact zones, ladle walls and bottoms. It is the most widely used working lining material for various steel ladles.
4. LF Refining Furnace and VD Vacuum Degassing FurnaceSlag areas and high-temperature linings under vacuum refining conditions.
5. Non-Ferrous Metallurgical EquipmentCopper, lead and zinc smelting furnaces and alkaline melting kilns with severe slag corrosion.

4. Complete Production Process

First, we select high-grade raw materials including fused magnesia sand and large flake graphite, and match anti-oxidant powder accordingly. Second, raw materials are weighed precisely and mixed evenly with modified resin binders under constant temperature control. Third, mixed materials go through high-pressure hydraulic pressing to form compact brick blanks. Fourth, semi-finished bricks receive low-temperature curing treatment to stabilize resin bonding strength. Finally, every batch undergoes strict laboratory testing on chemical and physical indicators, followed by waterproof packaging suitable for long-distance sea transportation.

5. Main Technical Specifications

Magnesia oxide content of our magnesia carbon bricks ranges from 70% to 98%, while fixed carbon content can be customized between 6% and 20%. The bulk density of finished products falls within 2.80 g/cm³ to 3.10 g/cm³, with cold crushing strength no less than 30 to 45 MPa. Apparent porosity is controlled below 4% to 6%, and the long-term service temperature reaches 1600°C to 1800°C.

6. Our Factory Competitive Strength

1. Superior Raw Material SupportOur factory is located in China’s core magnesia resource zone. We maintain stable supply of high-quality fused magnesia and control raw material costs effectively.
2. Professional Customization ServiceOur technical engineers design exclusive MgO-C brick formulas matching different steel grades and furnace operating environments.
3. Strict Quality Inspection SystemEach batch is fully inspected for chemical composition, bulk density, mechanical strength and oxidation resistance. We can provide ISO and SGS certified inspection reports upon request.
4. Flexible Production & Fast DeliveryWe keep sufficient stock of standard magnesia carbon bricks, with delivery cycles from 15 to 30 days. OEM special-shaped brick processing is also acceptable.
5. Rich Global Export ExperienceOur magnesia carbon bricks are steadily exported to steel plants across Southeast Asia, the Middle East, Europe and Latin America. We adopt professional moisture-proof sea packaging to avoid damage during transit.

7. Inquiry Guidance

If you need durable refractory lining for steel converters, electric arc furnaces or steel ladles, magnesia carbon bricks are your most cost-effective solution. Kindly send us details including furnace type, actual working temperature and required carbon content. Our technical team will prepare a free customized quotation and full technical support for you without delay.