Ferro Chrome Sand 0.25-0.35mm AFS 45/55
Ferro Chrome Sand 0.25-0.35mm AFS 45/55 is a kind of foundry sand with high refractoriness. The content of Cr2O3 of moulding chromite sand should be at least 46%. That will get high Solid-phase sintering temperature. Chrome ore sand is especially featured with its high thermal conductivity. It can not only make the casting steel cool quickly, but also prevent casting iron& steel from sand-sticking. The expansion rate of Ferro Chromite sand is low, it make the casting volume steady avoiding casting unshape defect.
Ferro Chrome Sand 0.25-0.35mm AFS 45/55 Characteristics:
- High melting point, high sintering temperature
- Excellent thermal stability
- High density, high density –
- Medium Mohs hardness 5.5
- Strong thermal conductivity
- Low coefficient of thermal expansion
Technical Index of Ferro Chrome Sand 0.25-0.35mm AFS 45/55:
- Chemicals
| Content | Guarantee Value | Typical Value |
| Cr2O3 | ≥ 46% | 46.70 |
| SiO2 | ≤ 1.0% | 0.61 |
| FeO | ≤ 26.5% | 26.2 |
| Cr:Fe | ≥1.5:1 | 1.55 |
| MgO | ≤ 10% | 9.8 |
| CaO | ≤ 0.3% | 0.3 |
| Al2O3 | ≤ 15.5% | 15.4 |
| P | ≤30 ppm | 28 ppm |
| S | ≤30 ppm | 27 ppm |
- Physical index:
| Mohs Hardness | 5.5-6 |
| Melting Point | 2180 ℃ |
| Sintering Point | ＞1800℃ |
| Specific Gravity | 4.0-4.8 g/cm3 |
| Bulk Density (LPD) | 2.5-3 g/cm3 |
| Color | Black |
| PH Value | 7-9 |
| Thermal conductivity | 0.63 W/M·K |
| Thermal Expansion Rate（1000℃） | 0.6% |
| Acid Demand Value (ADV) | PH3:≤ 3ML PH4: ≤ 2ML PH5: ≤ 2ML |
| Turbidity(NTU) | ≤ 200 |
| Soil content | ≤0.1% |
| Moisture | ≤0.1% |
Particle distribution of Ferro Chrome Sand 0.25-0.35mm AFS 45/55:
| Sieve Mesh | Residue Percentage |
| +40mesh(425um) | 2.40% |
| +50mesh(300um) | 36.80% |
| +70mesh(212um) | 41.70% |
| +100mesh(150um) | 13.70% |
| +140mesh(106um) | 3.20% |
| Grain Fineness(GFN) | AFS 50.184 |
Applications of Ferro Chrome Sand 0.25-0.35mm AFS 45/55:
- Large scale thick walled casting: Chromite sand combined with sand casting, furan resin self hardening sand, water glass self hardening sand and other processes are used for large volume and weight cast iron and steel castings. It can cool the castings in a predetermined order, which is conducive to improving the internal tightness of the castings and enhancing their strength. In addition, for the process of using silica sand, chromite ore sand can be used as surface sand instead of silica sand in key areas where porosity and veins are prone to occur, which can effectively prevent casting defects such as cracks and porosity.
- Lost foam casting. In lost foam casting, using chrome ore sand can prevent defects such as sand inclusion and sticking caused by quartz sand casting. Used for manufacturing castings such as valves and impellers made of high chromium cast steel and high manganese steel materials.
- Shell casting: Chromite sand can be used as a core sand material for complex components in shell casting, making sand cores. Used for producing high-precision, smooth surface 304316 stainless steel castings and carbon steel precision castings. It can effectively prevent the problem of sand sticking in the inner cavity of castings.
- Sand casting: Chromite sand can also be used for sand casting, such as sand casting, water glass self hardening sand casting, etc., to produce various large, medium, and small parts, such as pump bodies, pipelines, valves, etc.
Production of CFerro Chrome Sand 0.25-0.35mm AFS 45/55:
Package of Ferro Chrome Sand 0.25-0.35mm AFS 45/55:
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