Continuous casting steel ladle’s working condition is severer than mold casting steel ladle, so continuous casting steel ladle should choose high-quality refractories. EAF ladles and converter ladles have different working conditions, such as turnover speed, temperature fluctuation, etc. So different refractory materials should be chosen correspondingly.
Eaf Continuous Casting Ladle Refractories
As said earlier, EAF smelting turnover speed is slow, great temperature fluctuation is apt to cause ladle lining crack and spalling, moreover, continuous casting and refinery make the working condition harsher, so ladle lining should be built by high quality firebricks. Slag line is usually built by magnesia carbon bricks. Melting bath(including wall and bottom) is normally built by alumina magnesia carbon bricks or magnesia carbon bricks, in Europe, carbon binding unburned magnesia calcia bricks are adopted in some steel factories. Only a few factories choose unburned alumina magnesia bricks or high alumina bricks, which can improve thermal conduction and solve carbon increasing problem. Magnesia mortar is usually used as bricks joints sealing material. With regard to patching, magnesia gunning mix, alumina magnesia patching mix and alumina magnesia carbon coating material are widely used.
Eaf Continuous Casting Ladle Refractories Physiochemical Index
| Item | MgO-C brick | Magnesia carbon brick | Alumina magnesia carbon brick | Al-Mg-C brick | Al2O3-MgO-C brick |
| Application | Slag line | Slag line, wall and bottom | Ladle wall | Ladle wall | Ladle wall |
| MgO %≥ | 78 | 85 | 12 | 12 | 20 |
| Al2O3 %≥ | / | / | 65 | 70 | 60 |
| F.C % | ≥14 | ≥10 | 5~7 | 7~10 | 7~10 |
| Apparent porosity% | ≤4 | ≤4 | ≤10 | ≤5 | ≤5 |
| Bulk density g/cm3 | ≥2.90 | ≥2.95 | ≥2.75 | ≥2.95 | ≥2.95 |
| Compression strength Mpa | ≥40 | ≥40 | ≥25 | ≥50 | ≥50 |
| RUL ℃ | 1700 | 1700 | 1700 | 1700 | 1700 |
| Liner change rate % | 0~1 | 0~1 | <2 | <2 | <2 |
| Item | Alumina magnesia spinel carbon brick | Magnesia carbon brick | Magnesia calcia carbon brick | Magnesia calcia carbon brick | Alumina magnesia unburned brick | Unburned high alumina brick |
| Application | Ladle bottom | wall and bottom | wall and bottom | wall and bottom | wall and bottom | wall and bottom |
| MgO %≥ | 12 | 80 | 40 | 60 | 12 | / |
| Al2O3 %≥ | 70 | / | / | / | 70 | 80 |
| F.C % | ≥5 | / | 5 | 5 | 5 | 5 |
| CaO % | / | / | ≥50 | ≥30 | / | / |
| Apparent porosity% | <7 | <7 | <7 | <7 | <18 | <18 |
| Bulk density g/cm3 | >2.90 | 2.90 | 2.90 | 2.90 | 2.90 | 2.85 |
| Compression strength Mpa | >30 | >30 | >30 | >30 | >50 | >50 |
| RUL ℃≥ | 1700 | 1700 | 1700 | 1700 | 1350 | 1500 |
| Liner change rate % | 0~1 | 0~1 | 0~1 | 0~1 | 0~1 | 0~1 |
| Item | Magnesia gunning mix | Alumina magnesia patching mix | Alumina magnesia carbon patching mix | Magnesia mortar ( magnesia jointing material ) |
| Application | Working lining | Working lining | Working lining | Firebrick joint |
| MgO %≥ | 90 | 15 | 15 | 90 |
| Al2O3 %≥ | / | 75 | 75 | / |
| F.C % | / | / | ≥5 | / |
| SiO2 % | <7 | / | / | / |
| Liner change rate % | ±1.5 | ±1.5 | ±0.5 | ±1.0 |
Converter Continuous Casting Ladle Refractories
Converter continuous casting ladle’s turnover speed is quicker, temperature fluctuation is smaller and working condition is better. So for small size converter ladles, bauxite magnesia castable is used to construct integral lining and can be patched to prolong service life.
For middle size and large scale ladles, corundum magnesia castable and corundum alumina magnesia spinel castable are usually used as ladle wall and bottom working lining. Slag line zone is usually built by magnesia carbon bricks. Castable which can be worked by gunning casting have been applied in some countries and have obtained very nice effect. Gunning castable includes alumina magnesia gunning castable, magnesia gunning castable, magnesia spinel gunning castable and so on.
Converter Continuous Casting Ladle Refractories Physiochemical Index
| Item | Magnesia carbon brick | Alumina magnesia castable | Alumina magnesia castable | Magnesia mortar | Magnesia ramming mass |
| Application | Slag line | KIP gunning machine | CAS tube | Ladle working lining | Joint, sealing and taphole |
| MgO %≥ | 78 | 2 | 5.7 | 95 | 90 |
| Al2O3 %≥ | / | 90 | 90 | / | / |
| F.C % | ≥14 | / | / | / | / |
| Apparent porosity % | ≤4 | / | / | / | / |
| Bulk density g/cm3 ≥ | 2.90 | 3.00 (110℃) | 3.10 (110℃) | / | 2.85 (110℃) |
Rongsheng Refractory Materials Manufacturer
Rongsheng Kiln Refractory Manufacturer, as an experienced refractory material supplier, we provide customers with high-quality refractory material services. Our refractory products cover all kinds of refractory bricks, unshaped refractory materials, thermal insulation materials, etc. Rongsheng’s newly built fully automatic monolithic refractory production line has an annual output of 80,000 tons. which are widely used in metallurgy, nonferrous metals, building materials, electric power, petrochemical, and other industries. Its products are sold in more than 60 countries around the world and have won wide acclaim from customers. If you are in need of steel ladle refractories, please leave us your detailed requirements, we will feed you back ASAP.
