The casting coating is improved and adjusted on the basis of the traditional casting coating, which can prevent the oxidation of high-temperature liquid metal, and no chemical reaction occurs during the contact between the casting mold and the high-temperature liquid metal. And can absorb and digest nitrogen, sulfur, carbon and other gases.

So as to solve: casting iron machining sticky sand, trachoma, roughness, pores, inclusions (slag), ball mill iron deterioration, cast steel sulfide cracks, carburizing defects, etc.

The main products are: gray iron castings, ductile iron castings, heat-resistant castings, alloy castings, etc.

Principle analysis of defects such as sand sticking, pores and sand holes in castings

Castings stick to the sand because the coating does not act as a barrier or isolation, or the coating chemically reacts with the hot liquid metal.

1. Poor paint adhesion: when the sand is filled with vibration, the paint will peel off, causing the casting to stick to sand.

2. The expansion coefficient of the coating is large: when the coating is in contact with the high-temperature molten metal, the volume of the coating expands and leaves the mold, causing sand sticking to the casting.

3. The high-temperature liquid metal is oxidized, reacts chemically with the coating and the mold to form metal oxides and Undercut Machining, has adhesion to the coating and the molding sand, and can firmly attach the molding sand to the surface of the casting to form a series of low-melting compounds[ In the thick walls and corners of castings, there are many low-melting substances (behind the sticky sand layer), resulting in sticky sand in castings.

Cast trachoma:

1. Sand falls into the mold.

2. The coating has low strength, poor fire resistance, and cannot withstand the scour of high-temperature molten metal, and there is molding sand in the casting.

Casting porosity: There are many reasons. The common one is that there are many substances with large machining gas content in the mold, which produces gas. The air permeability of paint or sand is poor, and the gas is not removed in time.