In steel industry, induction furnace is preferred as a convenient melting unit because of its high efficiency, low energy consumption, easy operational control, and good performance with various kinds of steel scrap.
Furnace performance is directly related to the performance of its lining. Well laid and stabilized lining results in smooth working of furnace, optimum output, and good control of the metallurgical reactions.
The lining practice best suited to a particular furnace depends upon the capacity and design of the furnace, operation practice adopted during making of a heat, and furnace output.
For successful and consistent performance of the lining, the important aspects are (i) use of proper grade and quality of the lining material, (ii) careful and systematic lining practice, and (iii) consistency in working conditions.
Al2O3-MgO type spinel formed neutral linings are the most popular and abundantly used refractory materials in induction furnaces due to their high melting point, high strength, high hardness, and high wear resistance, high corrosion resistance and calculated consumption per MT of Steel production.
Neutral refractory has become the new trend in steel foundries because of its success in minimizing the lining related problems. Neutral lining has advantage over both silica and basic lining.
Specifications
1, Without Cr2O3 Content
Chemical Composition
| Al2O3 | MgO | SiO2 | Others |
| 84.5 | 15 | 0.2 | 0.3 |
Physical Properties
| Bulk Density (gm/cm3) | Maximum Working Temperature (℃) | Suggested Working Temperature (℃) |
| 3.05-3.15 | 1850 | 1630-1750 |
2, With Cr2O3 Content
Chemical Composition
| Al2O3 | MgO | Cr2O3 | Fe2O3 | CaO |
| 84.6 | 11.0 | 2.8 | 0.2 | 0.3 |
Physical properties
| Bulk Density (gm/cm3) | Maximum Working Temperature (℃) | Suggested Working Temperature (℃) |
| 3.15-3.25 | 1850 | 1630-1800 |