Primary Wear & Corrosion Factors: FeO-rich hyper-basic slag dissolution, oxygen jet turbulence, scrap impact at the charge pad, thermal cycling, carbon oxidation
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 | Slag Line & Trunnion | High-Purity Fused Magnesia Carbon Brick (XZK-MC-14AF1/F2) | MgO ≥77%, C 15%, BD ≥3.05 g/cm³, HMOR (1400°C) ≥14 MPa | Superior chemical resistance to hyper-basic FeO-rich converter slags. | Quote |
| 2 | Cone & Upper Mouth | Anti-Spalling Magnesia Carbon Brick (XZK-MC-14AF3) | MgO ≥76%, C 15%, BD ≥3.05 g/cm³, CCS ≥43 MPa | Resists scrap impact, thermal spalling during tilting, and slag build-up chipping. | Quote |
| 3 | Bottom & Purging Plugs | Dense Magnesia Carbon Brick (XZK-MC-14AF1) | MgO ≥77%, C 15%, High hot modulus of rupture | Provides stable multi-hole argon blowing channels for efficient combined blowing. | Quote |
| 4 | Taphole Sleeve & Seating | High-Density Magnesia Carbon (XZK-MC-12AF1/F2) | MgO ≥79%, C 13%, BD ≥3.05 g/cm³, HMOR ≥14 MPa | Clean steel tapping flow control with minimal nozzle bore diameter expansion. | Quote |
A 300 t BOF lining uses roughly fourteen distinct brick positions, and each has a different dominant failure mechanism. Lining the vessel with one grade guarantees that the harshest zone fails first and everything else is relined prematurely. That is the single largest source of avoidable refractory cost in a converter shop.
In most converters, carbon oxidation precedes slag attack. Once oxygen or FeO reaches the graphite, the brick loses its slag barrier, porosity climbs, and penetration accelerates. Antioxidant selection — Al and Si at lower temperatures, SiC and B₄C through 1400–1600 °C — typically buys more campaign life than simply raising carbon content.
Magnesia gunning mix restores the slag line and charge pad between planned relines, levelling the wear profile so the vessel is not taken out on a single thin spot. Gunning is a maintenance tool, not a substitute for correct grade selection — if a zone needs gunning every few heats, that is a signal to re-grade it.
Vessel capacity, blowing practice (top, bottom or combined), slag basicity and FeO, scrap practice, current campaign life and which zone controls it, plus photographs of the worn lining. We will return a zone-by-zone grade map with a consumption forecast and a projected campaign life.
XZK delivers precise zonal lining packages for BOF Basic Oxygen Converter Refractory 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.
The slag line carries the most extreme combination of basic slag (C/S ratio ≥ 3.5), oxygen jet scouring and thermal cycling — high-purity fused magnesia (≥97% MgO) with 14–18% flake graphite gives the right balance of oxidation resistance and chemical resilience. Our XZK-MC-14AF1/F2 series is the industry workhorse for slag-line and trunnion zones.
Bottom purging reliability starts with MgO-C brick integrity (XZK-MC-14AF1 with HMOR ≥14 MPa), but the real secret is precise installation tolerance (≤1 mm joints) and our recommended joint mortar specification. We also supply monolithic purging plug systems with 100% open-rate guarantee.
Slag splashing is an excellent way to extend BOF lining life — we help mills define optimal slag chemistry and viscosity windows for their specific carbon and MgO brick grades, reducing skull accumulation and doubling lining campaigns.
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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.