Q: what are the best coatings and application processes for large steel castings and cast iron castings?

A: ASK has developed a very strong refractory coating with optimized properties to eliminate sand adhesion in thick section cast iron and steel, but is not suitable for manganese steel that requires a more specialized refractory substrate.

In addition to the absolute volume of the metal, head pressure and high casting temperature can also lead to extremely difficult casting conditions when pouring large, large-section (greater than 150 ~ 200 mm) castings and castings. Controlling these effects and their effect on mold penetration requires a unique coating formulation that can establish and act as a barrier at the mold/metal interface.

In order to obtain a smooth and smooth casting surface in such a harsh application, the correct choice of refractory coating is very important. The paint must form a coating strong enough to prevent the metal from interacting with the sand. To obtain a coating thick enough to achieve this, multiple layers of refractory coating may be required. The heat generated by the burning between the two layers must be able to withstand without foaming, and the painted surface of the mold must be thoroughly dry before the molten metal is cast.

ASK has developed SOLITEC? The ST 909 can meet these critical performance requirements.

SOLITEC ST 909 is a universal coating that can be coated by flow coating, spray coating, dip coating, brush coating, etc. It also contains a drying indicator that, when used on most types of cores and castings, will change the color of the coating from blue when wet to light yellow when dry.

When applying multilayer coating, the attribute of “color modification” is very important. On top of the previous coating, each subsequent coating is visible. It is important to note that the initial color of the sand may have some effect on the final color of the coating. Generally, the coating will revert to blue if water is present or reintroduced on the core/cast.