mollite-corundum and corundum castable mixes
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Name of indexes
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Kind of castables | |||||
| Rocast 75 | Rocast 91 | Rocast 91-1 | Rocast 93 | Rocast 95 | Rocast 95-1 | |
| 1. Application limit temperature, oC | 1600 | 1700 | 1700 | 1750 | 1800 | 1800 |
| 2. Content, % | ||||||
| Al2O3, not less | 75 | 91 | 91 | 93 | 96 | 95 |
| Fe2O3, not more | 1,8-2,3 | 1,0-1,5 | 1,8-2,3 | 1,8-2,3 | 1,8-2,0 | 1,8-2,3 |
| CaO, not more | 2,3 | 0,7 | 0,7 | 0,7 | 0,03 | 0,03 |
| 3. CCS after 3 days hardening and aftertreatment, n/mm2 | ||||||
| at t= 100 oC | 55 | 45 | 75 | 10 | 55 | 55 |
| at t= 1000 oC | 45 | 45 | 85 | - | 55 | 65 |
| at t= 1500 oC | - | - | - | - | - | 110 |
| 4. Thermal shock resistance by method 1300 oC – water , cycles, not less | 20 | 15 | 20 | 10 | 18 | 20 |
| 5. Moistening water, %, within limits | 4,5-5,0 | 4,5-5,0 | 5,0-5,5 | 4,5-5,5 | 4,5-5,5 | 4,5-5,5 |
Application:
Mullite-corundum (Rocast 75) – rainforce layer of steel ladles and tundishes, upper blast tuyeres, cover of steel ladles, cover of tundishes, cover of gas elimination, rainforce layer of tundishes.
Mullite-corundum (Rocast 91, Rocast 91-1) – monolitic upper blast tuyeres, multiusing nozzles collectors, fighting plate, nozzles pocket blocks, outer lining of vacuumunit manifold, partitions of tundishes.
Corundum (Rocast 93, Rocast 95, Rocast 95-1) – central part of EAF roof, monolitic upper blast tuyeres, multiusing nozzle-collectors, outer lining of vacuum unit manifold.