SPECIFICATIONS OF REFRACTORY MATERIALS FROM IRMA MEMBERS
Some typical specifications of Indian refractories commonly used in the furnaces and kilns in steel, cement, non-ferrous metals and glass industries are given below. These are illustrative and do not cover the full range of products and some of the improved items which have been recently developed.
Basic Oxygen Furnace
| Magnesite/MgCr bricks | A | B |
| MgO % | 87 | 70 |
| Cr2O3 % | N.A. | 7-12 |
| A.P. % | 20 | 20 |
| CCS (kg/cm2) | 400 | 350 |
| RUL (ta °C) | 1600 | 1580 |
| Mag Carbon/AMC bricks | A | B | C | D | E |
| MgO % | 97 | 97 | 90 | 95 | 14 |
| Al2O3 % | N.A. | N.A. | N.A. | N.A. | 75 |
| FC % | 5 | 18 | 8-10 | 10 | 6 |
| A.P. % | 6 | 5 | 4 | 6 | 6 |
| B.D. (gm/cc) | 3.00 | 2.85 | 2.92 | 2.90 | 2.80 |
| CCS (kg/cm2) | 500 | 300 | 400 | 400 | 400 |
| MOR at room temp kg/cm2 | 150 | 100 | N.A. | N.A. | N.A. |
| MOR at 1400°C kg/cm2 | 40 | 100 | 90 | 40 | N.A. |
| Magnesite bricks for BOF/EAF | A | B | C | D |
| MgO % | 87 | 91 | 85 | 40 |
| Cr2O3 % | N.A. | N.A. | N.A. | 18 |
| A.P. % | 18 | 18 | 22 | 24 |
| CCS (kg/cm2) | 500 | 600 | 350 | 250 |
| RUL (ta °C) | 1600 | 1600 | 1550 | 1550 |
| PLC % (at 1600°C/2 hrs) | N.A. | N.A. | +0.5 | +0.5 |
| Magnesite bricks for BOF/VAD/VOD Ladle | A | B |
| MgO % | 96 | 60 |
| Cr2O3 % | N.A. | 15 |
| A.P. % | 17 | 22 |
| CCS (kg/cm2) | 500 | 350 |
| RUL (ta °C) | 1700 | 1650 |
| Direct Bonded bricks for VOD/AOD | A | B | C |
| MgO % | 60 | 66 | 65 |
| Cr2O3 % | 15 | 13 | 15 |
| A.P. % | 18 | 18 | 21 |
| CCS (kg/cm2) | 500 | 400 | 350 |
| RUL (ta °C) | 1740 | 1700 | 1650 |
| PLC % (at 1600°C) | N.A. | N.A. | +0.5 |
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© 2006-07, Indian Refractory Makers Association
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