CounterweightSteel shot is a crucial supporting and cooling material in the coated sand shell casting process. It is not used for surface treatment, but is filled between the sand mold (shell mold) and the sand box during the casting process, serving to reinforce support and assist in cooling.

The following is the detailed technical file regarding the buried box steel shot:

Core Function and Process

· Main function: As a filler to support the thin shell sand mold, preventing deformation or cracking during pouring.

· Typical process: Place the prepared mold in the sand box, fill it with steel balls around and compact them, then pour the molten material. The steel balls quickly conduct heat to accelerate cooling.

· Applicable castings: Suitable for high-quality small and medium-sized castings such as crankshafts, hubs, gears, as well as complex thin-walled precision parts like engine blocks and covers of automotive engines.

Physical and Chemical Properties

· Shape and Surface: Mostly round particles, the surface is usually electroplated to prevent rust.

· Chemical Composition: The material is cast iron or alloy.

· Carbon (C): 1.2 - 1.5%

· Manganese (Mn): 0.02 - 0.1%

· Silicon (Si): 0.01 - 0.1%

· Sulfur (S): ≤ 0.40%

· Phosphorus (P): ≤ 0.30%

· Physical Parameters: Common specifications are 1.0 - 10mm; density is approximately 6.7 - 7.2 T/m³; bulk weight is approximately 4.2 - 4.5 T/m³.