Technical indicators of alkali phenolic resin No-bake sand chromite granule AFS50-55
For steel castings with complex structures, manual coating of chromium ore sand on the surface of the castings can greatly improve the accuracy and surface quality of the workpiece. For example, for large cylinder castings with complex structures, use alkali phenolic resin no-bake sand technology. In this process, mix the resin with chromite granule AFS50-55. It can reduce sand sticking and cracks in the castings, and achieve ideal application results.
Technical indicators of alkali phenolic resin No-bake sand Chromite granule AFS50-55 raw sand:
| Content | Guarantee value | Typical value |
| Cr2O3 | ≥46.0% | 46.5% |
| SiO2 | ≤1.0% | 0.4% |
| FeO | ≤26.5% | 26.3% |
| CaO | ≤0.3% | 0.2% |
| MgO | ≤10% | 9.8% |
| AL2O3 | ≤15.5% | 15.2% |
| P | ≤0.003% | 0.001% |
| S | ≤0.003% | 0.001% |
| Moisture (105°C) | ≤0.1% | 0.01% |
| Cr/Fe | 1.55:1 | 1.55:1 |
Technical indicators of molding sand:
| Alkaline phenolic resin addition rate | 0.9-1.2% |
| The proportion of curing agent in alkaline phenolic resin | 19-21% |
| 4-hour compressive strength (at room temperature) | 0.4-1.0 MPa |
| 24-hour compressive strength (at room temperature) | ≥3.0MPa |
| Curing speed | Slow |
| Moisture content of molding sand | 0.7-1.0% |
