Perfect surface finish of castings, high refractoriness, and complete elimination of burn-on defects.
Chromite sand is a specialized, natural mineral with exceptional refractory and physicochemical properties, used in the most demanding branches of the foundry and metallurgical industries. Widely used as a key addition to molding sands, it constitutes a reliable solution where traditional silica materials are insufficient to maintain the technological regime.
How does chromite sand work in foundry molds and metallurgy?
Thanks to its unique structure and thermal properties, chromite sand exhibits excellent stability in contact with the molten metal:
- High refractoriness: Withstands the extreme temperatures prevailing during the pouring of cast steel and heavy cast iron, protecting the mold cavity from burn-on.
- High thermal conductivity: Exerts a chilling effect on the thick sections of the casting, accelerating the solidification process and minimizing shrinkage defects.
Application of PEDMO chromite sand
This material finds critical application in processes safeguarding contact with the molten metal:
- Addition to molding sands – protects cast iron and cast steel castings from destructive surface burn-on in the most thermally loaded areas.
Key benefits
- Sensational smoothness and cleanliness of the casting surface – a drastic reduction in the need for tedious cleaning and shot blasting.
- Complete elimination of mechanical and chemical burn-on – unparalleled resistance to penetration by heavy, hot metal.
- High thermal resistance – dimensional and chemical stability even in cores surrounded by massive cast steel walls.