Primary Wear & Corrosion Factors: Arc radiation at hot spots, foaming slag chemistry, scrap impact, oxidation at the slag line, thermal cycling on power-off
XZK Group provides integrated refractory packages engineered for zoned thermal and chemical stress. Every brick shape, mortar joint, and castable density is calibrated to ensure balanced refractory erosion and synchronized campaign shutdown schedules.
Zoned lining design targeting synchronized campaign wear across all operational furnace zones. Click a hotspot above to highlight a row here.
| # | Furnace Lining Zone | XZK Recommended Refractory Grade | Key Physical & Chemical Properties | Operational Mechanism & Benefits | 操作 |
|---|---|---|---|---|---|
| 1 | Hot Spots & Slag Line | Resin-Bonded Fused MgO-C Bricks (XZK-MC-12AF2/F3) | MgO ≥79%, C 13%, BD ≥3.07 g/cm³, CCS ≥48 MPa | Withstands intense localized plasma arc radiation and foaming slag. | Quote |
| 2 | EAF Delta Roof | High-Alumina Chrome Castable (XZK-CastE85) | Al₂O₃ ≥85%, Cr₂O₃ 2~5%, Service Temp ≤1750°C, CCS ≥40 MPa | Excellent thermal shock resistance under intense arc thermal cycles. | Quote |
| 3 | Furnace Hearth | Magnesia Dry Ramming Mass (XZK-ERam-80) | MgO ≥80%, Bulk Density ≥2.20 g/cm³, Sintering Temp 1500°C | Dense self-sintering working layer provides superior molten steel sealing. | Quote |
| 4 | EBT Eccentric Bottom Taphole | EBT Sleeve (XZK-MC-12AF1) & End Brick (XZK-ASC-16F1) | Al₂O₃ 73%, C 17%, BD 3.10 g/cm³, High wear resistance | Guarantees vortex-free slag-free tapping into steel ladle. | Quote |
In an electric arc furnace, roughly 70% of lining consumption concentrates in three places, and each needs a different material:
Magnesia dry ramming mass (XZK-ERam-80) forms the working hearth. It is installed dry and sinters in service, and the value is in the sintering gradient: a dense, strong sintered face with a partly unsintered, compliant layer behind it. Without that gradient the whole layer sinters, becomes rigid, and cracks as the hearth expands.
Installation discipline — layer thickness, compaction between layers, and a controlled first-heat ramp — determines hearth life more than the material specification does.
The eccentric bottom taphole assembly is a frequent bottleneck. It needs a matched set: taphole seating and sleeve blocks in MgO-C, and ASC end blocks where the Al₂O₃-SiC-C combination handles the erosion and thermal load. Waterless clay is used for the tapping channel and EBT filler.
Magnesia gunning mix repairs hot spots and the slag line between campaigns, including hot gunning during short power-off windows. Rebound is usually a mismatch between mix grading and gunning equipment rather than a product defect — give us the machine make and model and we will grade the mix to suit.
Furnace type (AC, DC or shaft), capacity, transformer power, scrap mix, slag practice, tap-to-tap time and current campaign life with the controlling zone. We will return a zonal material schedule covering wall, slag line, hearth, roof and EBT.
XZK delivers precise zonal lining packages for Electric Arc Furnace (EAF) Lining Solution. Every grade in the matrix above is calibrated against three engineering levers: heat-flow management, chemical resistance, and mechanical anchoring. By tuning these three levers, we extend campaign length while keeping total refractory consumption per ton of steel competitive.
Our chief engineer Professor Shi Gan oversees every lining proposal — heat balance calculation, brick sequence optimization, and pre-assembly tolerance verification are all performed in-house before any shipment leaves Xinmi. The result: lining campaigns that match or beat OEM schedules with measurable per-ton savings.
Verified deliveries to leading steel groups across Asia, Europe and the Americas.
150 t torpedo car — complete refractory supply
80–120 t EAF ladles — working lining, purging plug & well block
EAF slag line & ladle slide gate system
Click to expand answers from our senior metallurgical engineers.
Three zones account for over 70% of EAF lining consumption: the hot spots (directly under the three electrodes — extreme localized radiation), the slag line (foaming slag chemistry attack) and the delta roof (rapid thermal cycling during arc strikes). Each requires a different grade: XZK-MC-12AF2/F3 for hot spots, chrome-alumina castable XZK-CastE85 for the delta roof.
A reliable EBT needs three things: tight sleeve joints (we recommend 0.5 mm tolerance), alumina-carbon material grade that resists both vortex erosion and thermal shock, and proper sand filling during operation. Our XZK-ASC-16F1 end brick combined with XZK-MC-12AF1 sleeve gives vortex-free tapping without slag carry-over.
For AC EAF delta roofs we still recommend our chrome-alumina castable (XZK-CastE85) — it withstands the heat radiated from the electrode arc better than water panels alone and prevents costly arc flash-through events. For DC EAF with bottom electrode, the hearth design is critical and we provide full CAD layout drawings.
High-velocity molten…
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Extreme compressive …
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Intense hot metal wa…
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Extreme basic slag c…
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High-temperature vac…
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Long multi-heat sequ…
View 3D Lining Configuration →Every batch of raw materials is chemically assayed. Finished refractory shapes undergo density, ultrasonic non-destructive testing, and pre-assembly gap verification prior to global packaging.