Tundish working lining castable (magnesia dry mix) features high MgO content, dry vibrating installation, fast baking and easy stripping, offering excellent erosion resistance for continuous casting tundishes.
| MgO content | ≥ 90% |
|---|---|
| Bulk density (110℃×24h) | ≥ 2.30 g/cm³ |
| CCS (110℃×24h) | ≥ 8 MPa |
| CCS (1500℃×3h) | ≥ 35 MPa |
| MOR (1500℃×3h) | ≥ 5 MPa |
| PLC (1500℃×3h) | 0～-1.0% |
| Refractoriness | ≥ 1790℃ |
| Service temperature | ≥ 1600℃ |
Tundish working lining castable (tundish dry mix) is a high-magnesia unshaped refractory made from fused and high-purity sintered magnesia aggregates with carbon-containing or carbon-free binder systems. It is installed by dry vibrating: the dry mix is placed between the permanent lining and a former, vibrated to compact, then baked into a dense working lining. With high refractoriness, excellent resistance to molten steel erosion and scouring, easy stripping and no steel adhesion, it is the mainstream material for continuous casting tundish working linings, widely used in long-life and quick-change tundish processes.
Dry mix is installed by dry vibrating with very little water, bakes fast and strips easily, suiting quick-turnaround tundish processes; wet castable requires longer curing and baking, and is often used for permanent lining or when time allows.
For low-carbon and clean steel, choose carbon-free (magnesia / magnesia-calcia) system to avoid carbon pickup; for ordinary steel grades, carbon-containing system offers better erosion resistance.
Depending on tundish capacity, steel grade and baking practice, a conventional working lining can serve several to over ten heats; combined with flow control devices, life can be further extended.
Yes. Henan Songrui New Refractory Materials Co., Ltd. provides formulations and installation guidance by tundish capacity, shape and steel grade.
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