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Iron Melting and Holding
Quartz based acid materials are recommended as working linings:
For the quartz lining, the transformation of the quartz crystal during the heating process causes a rapid change in volume, which makes the lining material tighter and obtains a well-sintered lining.
The transition process of quartz is irreversible, but the volume of the lining after sintering is relatively stable even the temperature changes. Familiarity with the crystallographic properties of quartz is beneficial for obtaining excellent lining service life and formulating sintering and cold-start technology.
Quartz crystallographic diagram:
In order to improve the service life of the lining, SFR recommends customers to use fused quartz lining materials.
Mainly utilize the following characteristics of fused quartz:
Nearly zero thermal expansion rate.
Excellent thermal stability
High purity (high SiO2 content, low content of iron, potassium, sodium, titanium, etc.)
Stable chemical properties.
Special mechanical control, stable particle size distribution.
Appearance: colorless transparent block, granule or white powder.
Lining materials for melting and holding iron:
SIL-RAM 161 is a common quartz-based material, and the binder of B2O3 (0.6%, 0.8%, 1.0%, 1.2%, etc.) can be selected according to the tapping temperature and other melting parameters;
SIL-RAM 162/SIL-RAM 163/SIL-RAM167 are acid lining material containing fused quartz. they have excellent volume stability and anti-erosion ability. they can be applied as the entire lining material or used with ordinary quartz materials. Fused quartz material can improve the problem of excessive erosion of the lower part of the lining, and also can reduce the crack and peel off risks at the upper part of the lining;
SIL-RAM 165CR is an acid lining material containing both fused quartz and chrome oxide. It has excellent volume stability, and chrome oxide improves the anti-erosion ability of the material. The service life is superior to the acid material produced by domestic and foreign manufacturers.
SIL-RAM 169CR is an acid lining material added with chromium oxide. The addition of chromium oxide improves the corrosion resistance of the material. It is usually used in the coreless induction furnace for melting iron at high temperature or high-carbon steel.
| No. | Location | Product Name | Product Description |
Al₂O₃ % |
SiO₂ % |
Cr₂O₃ % |
CaO % |
Bulk Density g/cm³ |
Max.App.
Temp.℃ |
| 1 | cover | ULTRA-CAST 200 | Alumina Based Castable | 45.0 | 50.0 | 2.0 | 2.30 | 1650 | |
| 2 | Spout | ALU-PAK® 55 |
Alumina Based Plastic
|
61.0 | 32.0 | 2.55 | 1680 | ||
| ALU-PAK® 67 |
Alumina Based Plastic
|
68.0 | 26.0 | 2.65 | 1700 | ||||
| ALU-PAK® 85 | Bauxite Based Plastic | 85.0 | 8.5 | 2.65 | 1650 | ||||
| 3 |
Upper Ring
|
ULTRA-FLO 85 |
Alumina Based Castable
|
84.0 | 12.0 | 2.0 | 2.85 | 1800 | |
| ULTRA-FLO 60 |
Mullite Based Castable
|
63.0 | 30.0 | 1.5 | 2.50 | 1700 | |||
| 4 | GROUT | COIL CRETE 390 |
White Alumina Based Grout
|
85.0 | 6.0 | 5.0 | 2.60 | 1760 | |
| COIL CRETE 590 | Red Alumina Based Grout | 91.0 | 2.0 | 5.0 | 2.80 | 1760 | |||
| 5 |
Patching
material |
ALU-SEAL 68 |
Alumina Based Plaster
|
68.0 | 26.0 | 2.65 | 1650 | ||
| ALU-PAK® 73CR |
Bauxite Based Plastic
|
75.0 | 9.0 | 4.0 | 2.85 | 1750 | |||
| 6 | Work lining | SIL-RAM 161 |
Silica Based Dry-Ramming
|
98.2 | 2.15 | 1650 | |||
| SIL-RAM 162 | Fused Silica Based Dry-Ramming | 98.2 | 1.98 | 1650 | |||||
| SIL-RAM 163 | Fused Silica Based Dry-Ramming | 98.2 | 1.90 | 1650 | |||||
| SIL-RAM 167 | Fused Silica Based Dry-Ramming | 98.2 | 1.98 | 1700 | |||||
| SIL-RAM165CR |
Fused Silica Based Dry-Ramming
with Chrome Addition |
98.2 | 1.0 | 2.15 | 1700 | ||||
| SIL-RAM169CR |
Fused Silica Based Dry-Ramming
with Chrome Addition |
97.5 | 1.0 | 2.20 | 1700 | ||||
| 7 |
push out blocks
|
ULTRA-FLO 85 |
Alumina Based Castable
|
84.00 | 12.00 | 2.85 | 1800 | ||
| 8 |
slip plane
|
SFR-MICA | 0.3 mm thick mica paper | 900 |