Magnesia Brick
Magnesia brick with periclase as the main phase (MgO≥95%, refractoriness ≥2000℃) offers outstanding resistance to basic slags and iron-oxide slag plus excellent high-temperature performance.
MgO Content≥95%
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Magnesia-Carbon Brick
Magnesia-carbon brick bonds magnesia with graphite (MgO≥76%, C 14-18%, 1750℃ max). Carbon does not wet slag, giving exceptional slag-line erosion resistance and thermal-shock stability far better than burned magnesia brick.
Technical Data
| MgO Content | ≥76% |
|---|---|
| C Content | 14-18% |
| Bulk Density | ≥2.95 g/cm³ |
| CCS | ≥40 MPa |
| Apparent Porosity | ≤4% |
Description
Magnesia-Carbon Brick
Material System & Positioning
Magnesia-carbon bricks are made from fused magnesia, high-purity sintered magnesia and flake graphite bonded with phenolic resin under high pressure: MgO ≥76%, carbon 14-18%, bulk density ≥2.95 g/cm³. Carbon does not wet slag, giving excellent slag penetration and slag line resistance; graphite's conductivity and low expansion markedly improve thermal shock stability over burned magnesia bricks. It is Henan Songrui's core grade for converters, EAFs and ladle slag lines, adjustable in magnesia/carbon ratio.
Key Performance
- Excellent slag resistance: carbon non-wetting gives strong slag-line attack resistance.
- Thermal shock stability: markedly better than burned magnesia bricks.
- High strength: CCS ≥40 MPa, apparent porosity ≤4%.
- Adjustable design: MgO/C ratio tuned by furnace type and zone.
- Long life: main working-lining material for converters, EAFs and ladle slag lines.
Applications
- BOF: converter working lining (cone, barrel, bottom), tap holes.
- EAF: hot spots, slag line walls, hearth.
- Ladle refining: ladle slag lines, LF/VD slag zones.
- Steelmaking support: around porous plugs, tap-hole seat blocks.
Selection Advice
Carbon content and MgO purity balance performance and cost: high-carbon high-purity grades for slag lines and hot spots; lower-carbon grades for hearth economy. Burned magnesia-carbon bricks for converter repair pair with patching materials.
Installation & Maintenance
Store moisture- and oxidation-proof; lay with carbon-bearing mortar; heat up and put into service promptly to avoid carbon oxidation from prolonged holding. Installation design and maintenance advice available.
Quality Assurance
Henan Songrui New Refractory Materials Co., Ltd. (Xuanhua Town Industrial Park, Henan) is a 2024 Class A taxpayer and SRDI SME with a complete basic brick production line and testing laboratory. For selection, quotation or installation, contact Manager Zheng (17513376789 / 17513376789@163.com).
Key Features
- MgO-C carbon-bearing brick with excellent slag penetration resistance
- Carbon phase is non-wetted by slag, resists slag-line attack
- Far better thermal-shock resistance than fired magnesia
- Main material for converters, EAFs and ladle slag lines
- MgO:C ratio and carbon content adjustable per duty
- Keep dry/oxidation-free; use carbon mortar
Typical Applications
MgO-C brick combines magnesia and graphite for converters and ladles:
- Steel & Iron: converter linings (bottom, barrel, cone), EAF hot spots and slag lines, ladle slag line bricks, LF/VD ladle slag lines.
- Advantage: service up to 1750℃, graphite's poor wetting gives extreme slag resistance, high conductivity and thermal shock resistance.
FAQs
Why is MgO-C brick for converters?
MgO resists basic slag while graphite resists wetting and conducts heat—extreme slag resistance makes it the converter lining of choice.
Ladle applications of MgO-C brick?
Ladle and LF/VD slag lines—critical for ladle life.
Carbon content of MgO-C brick?
Typically 10-20% carbon; higher carbon improves slag resistance but reduces oxidation resistance.
Quotation & Custom Inquiry
Submit an inquiry or custom requirement for this product; reply within 24 hours
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