Features of chromite foundry sand
Chromite foundry sand is a natural sand that consists of a minimum 46% chromium oxide from chrome ore. It has the following features:
- High refractoriness: Chromite sand can withstand high temperatures and maintain its chemical stability. It can resist high temperatures of 1800 degrees. Thus it is ideal foundry sand for use in high-temperature applications such as foundry molding sand and core-making sand..
- Low thermal expansion: Chromite sand has a low thermal expansion coefficient, which means that it will not expand or contract excessively when exposed to high temperatures. The coefficient of thermal expansion is about 0.6% when pouring at 1400 degrees. This helps maintain the dimensional stability of the mold or core during the casting process.
- High specific gravity and good sintering properties: Chromite sand has a higher density than other foundry sands, which ensures that it settles firmly in the mold or core. Additionally, chromite’s unique sintering properties help bind the sand grains together, increasing the strength of the mold or core. Chromite sand makes the part in contact with molten steel quickly sintered. It is conducive to the sequential solidification of castings.
- Good flowability: The particle shape of chromite sand is round angular and without sharp corners, and the resin binder has good adhesion, which can ensure the quality and stability of casting molding. The feature makes it easy to pour and distribute throughout the mold or core.
- High compressive strength: Chromite sand has high compressive strength and can withstand high and low-pressure impacts from molding sand.
Due to its unique properties, chromite foundry sand is widely used in the foundry industry, especially as a mold and core material for steel and iron casting processes.
