The choice between powder metallurgy and die casting is often a matter of part size or material requirements, rather than economic issues. Commonly used die-casting materials are aluminum alloy, magnesium alloy and zinc alloy, and copper alloy die-casting parts are also used in a limited range. Because of the high melting point of ferroalloy and stainless steel, powder metallurgy technology should be adopted.

Compared with traditional powder metallurgy parts and metal injection molded parts, the size of die castings may be the same or much larger. When the main material requirements are required, powder metallurgy should be selected. For example, 1: Very high strength, the tensile strength of some iron-based sintered alloys is more than three times higher than the highest strength of die-cast alloys. 2: High wear resistance and high friction reduction performance, which can be solved by iron-based and copper-based sintered alloys impregnated with lubricating oil. 3: High operating temperature, which can be solved by iron-based and copper-based sintered alloys. 4: Corrosion resistance, copper-based sintered alloy and sintered stainless steel can meet the requirements

Between powder metallurgy and die-casting, zinc die-casting parts may be a substitute for iron-based powder metallurgy products under the condition that the service temperature is not higher than 65℃ and medium strength is required. The two processes are similar in terms of dimensional accuracy and demand for cutting. But in terms of tooling and processing costs, powder metallurgy is usually more advantageous.