High Corrosion Resistance Fused Cast AZS Block RTK-AZS41 from China Suppliers and Factory for Glass Furnace Applications
Brief Introduction
RTK fused cast AZS blocks are made of high-quality purified raw materials, using a special electric arc furnace, and a fused cast process that has undergone long arc melting and oxidation treatment. This process has almost no carbon contamination from the electrode. Due to the oxidation fused cast process and the use of high-purity raw materials, RTK fused cast AZS series have special and high resistance to the corrosion of molten glass, and have little contamination to the molten glass.
Fused cast AZS products can be divided into 41# AZS block (RTK-AZS41), 36 # AZS block (RTK-AZS36) and 33 # AZS block(RTK-AZS33) according to the different ZrO₂ content in the chemical composition. In addition, on the basis of RTK-AZS36 and RTK-AZS33 manufacturing processes, the content of corresponding chemical components of SiO₂ and Na₂O has been reduced, and two products, 36 # low silicon low sodium AZS blocks (RTK-AZS36D) and 33 # low silicon low sodium AZS blocks (RTK-AZS33D), have been formed. These five products are further classified according to different casting methods, which can meet the different use requirements of fused cast products in glass furnaces.
RTK-AZS41 has high corrosion resistance and low pollution to molten glass, and is suitable for parts in glass furnace that require high corrosion resistance, such as fully electric melting furnace, throat, weir, bubbler block, and doghouse corner block.
Chemical Composition
| Chemical Composition | Typical Value |
|---|---|
| SiO2% | 12 |
| Al2O3 % | allowance |
| ZrO2 % | 41 |
| Fe2O3 + TiO3 + CaO + MgO + Na2O + K2O % | ≤2.0 |
Physical Property
| Physical Property | Typical Value |
|---|---|
| Bulk density (dense part) g/cm3 | 4.05 |
| Apparent porosity (dense part) % | 0.6 |
| Initial precipitation temperature of vitreous phase °C | 1400 |
| Vitreous phase exudation (1500°C x 4hr) % | 1.5 |
| Anti-molten glass erosion speed under static condition mm/24hr | 1.2 |
| Bubble release rate % (1300°C x 10hr, ordinary soda lime glass) | 0.6 |
| Calculate Specific Gravity | Typical Value |
| Ordinary casting / inclined casting g/cm3 | 3.65 |
| Quasi-non shrinkage casting g/cm3 | 3.90 |
| Non shrinkage casting g/cm3 | 4.00 |
Frequently Asked Questions
RTK fused cast AZS blocks are made of high-quality purified raw materials using a special electric arc furnace and a fused cast process that has undergone long arc melting and oxidation treatment.
They are classified into RTK-AZS41, RTK-AZS36, and RTK-AZS33 based on ZrO₂ content. Additionally, there are low silicon low sodium versions: RTK-AZS36D and RTK-AZS33D.
RTK-AZS41 features high corrosion resistance and low pollution to molten glass, making it ideal for high-wear areas like the throat, weir, bubbler block, and doghouse corner block.
RTK-AZS41 typically contains 41% ZrO₂, 12% SiO₂, and the remaining balance is Al₂O₃, with impurities (Fe₂O₃, TiO₃, CaO, MgO, Na₂O, K₂O) kept under 2.0%.
The oxidation fused cast process ensures almost no carbon contamination from the electrode, resulting in high resistance to molten glass corrosion and minimal contamination of the glass output.