Chrome sand for foundry AFS30-35 AFS 35-40
Product Introduction of Chrome sand for foundry AFS30-35 AFS 35-40
China Chrome ore sand for steel casting is a natural spinel mineral sand. The main chemical in chrome ore sand is Chromium oxide and ferrous. 46% purity chrome ore sand is especially suitable for metal & steel & iron casting sand. It works well as core sand, molding sand, chill sand, and facing sand in foundry applications. Chrome ore sand featured high refractory, low expansion rate, and low thermal conductivity. It helps avoid sand sticking and makes better casting shapes.
Typical chemical composition of Chrome sand for foundry AFS30-35 AFS 35-40:
| 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 |
Typical physical properties of Chrome sand for foundry AFS30-35 AFS 35-40:
| Hardness: | Mohs:5.5-6 |
| Melting Point: | Sublimes at 2180 °C |
| Sintering point: | >1800°C |
| Specific Gravity: | 4.0-4.8 g/cm3 |
| Bulk density(LPD): | 2.5-3 g/cm3 |
| Turbidity (JTU) | 110 |
| Color: | Black |
| Grain shape | Sub-angular |
| PH Value | 7-9 |
| Percentage of free acid present in the sand: | 0% |
| The amount of the acid: | ≤2ML |
| Percentage of soil | ≤0.1 |
| Thermal conductivity | 0.63 W/M·K |
| Thermal expansion rate（1000℃） | 0.60% |
Characteristics of Chrome sand for foundry AFS30-35 AFS 35-40:
- High sintering temperature and refractoriness.
- Good grain shape without sharp angles.
- High thermal conductivity.
- Low thermal expansion ratio.
- Low magnetics and turbidity.
