矿机铸件铸造用铬砂40-70#
【产品名称】铬砂40-70#，铬砂40-70目，铬矿砂40-70#，铬铁矿砂40-70#
【别名】铬砂，铸造级铬矿砂，铬铁矿砂，铬矿砂
【特性】耐火温度高、比重高、抗渣性好、导热率高、激冷
矿机铸件铸造用铬砂40-70#是经过精选加工的铸造级铬铁矿砂。铬砂具有优秀的耐火性能和热传导性能，对于重型厚壁铸件，具有促进铸件顺序凝固，防止铸件气孔、粘砂等铸造缺陷。
铬铁矿砂在铸造工业中用作大型铸件的型砂、面砂和芯砂。铬矿砂研磨成细粉后在陶瓷和玻璃瓶生产中作为绿色或棕色着色材料，以及制动刹车片中的作为耐磨添加材料。
Chromite sand is a kind of foundry sand / refractory material crushed from natural chrome ore. Chromite is composed of chromium, iron, and oxygen (chemical formula FeCr2O4). It is an oxide mineral belonging to the spinel family. The chromium oxide content of chrome ore sand in nature varies. Low content chromium ore sand is used in metallurgical and chemical industries. High quality chromite sand with a chromium oxide content of 46 or above can be used as refractory and casting materials. Chromite sand is used in the metal casting industry due to its high thermal conductivity, providing cooling effects. Chromite sand has low thermal expansion. It helps to eliminate expansion defects. Chrome ore sand has a smooth black appearance and greater resistance to metal penetration than zircon. It has a higher acid demand than other sands, which means that more acid catalysts are needed when using furan resin. Chromite sand is commonly used in steel castings to provide cooling.
Chromium iron ore sand is used as molding sand, surface sand, and core sand for large castings in the casting industry. Chrome ore sand is ground into fine powder and used as a green or brown coloring material in ceramic and glass bottle production, as well as a wear-resistant additive in brake pads.
矿机铸件铸造用铬砂40-70#的特点：
- 高熔点,烧结温度高
- 优异的热稳定性
- 高密度，比重大
- 中等莫氏硬度5.5
- 热传导能力强
- 热膨胀系数低
The characteristics of chrome ore sand:
1. High melting point, high sintering temperature
2. Excellent thermal stability
3. High density, high density -
4. Medium Mohs hardness 5.5
5. Strong thermal conductivity
6. Low coefficient of thermal expansion
矿机铸件铸造用铬砂40-70#的化学成分：
| Cr2O3 | ≥46.0% |
| SiO2 | ≤1.0% |
| FeO | ≤26.5% |
| CaO | ≤0.3% |
| MgO | ≤10% |
| AL2O3 | ≤15.5% |
| P | ≤0.003% |
| S | ≤0.003% |
| Cr/Fe | 1.55:1 |
| 土质含量 | ≤0.1 |
| 水分含量 | ≤0.1 |
矿机铸件铸造用铬砂40-70#的技术指标：
| 莫氏硬度 | 莫氏硬度:5.5-6 |
| 熔点 | 2180 ℃ |
| 烧结温度 | ＞1800℃ |
| 比重 | 4.0-4.8 g/cm3 |
| 堆积密度 (LPD): | 2.5-3 g/cm3 |
| 颜色 | 黑色 |
| PH值 | 7-9 |
| 导热系数 | 0.63 W/M·K |
| 热膨胀率（1000℃） | 0.60% |
| 游离酸含量 | 0% |
| 酸耗值（ADV） | PH3: ≤3ML PH4: ≤2ML PH5: ≤2ML |
| 浑浊度(JTU) | 110 |
铬矿砂的型号:
| AFS细度 | 目数 | 颗粒尺寸 |
| AFS25-30 | 20-40# | 0.45-0.85mm |
| AFS30-35 | 20-50# | 0.3-0.85mm |
| AFS30-40 | 20-60# | 0.25-0.85mm |
| AFS35-40 | 30-70# | 0.2-0.6mm |
| AFS40-45 | 40-70# | 0.2-0.4mm |
| AFS45-50/AFS45-55 | 50-100# | 0.15-0.3mm |
| AFS60-65 | 70-140# | 0.1-0.2mm |
| / | 200#-0 | 0-75um |
| / | 325#-0 | 0-45um |
矿机铸件铸造用铬砂40-70#产品用途：
- 铸造行业：各种铸造工艺的面砂和型砂。
- 冶金耐火行业：铬质引流砂的原材料。
- 着色剂行业：陶瓷和玻璃产品的绿色/棕色/茶色颜料。
- 耐磨行业：刹车产品的耐磨填料。
