1. Material influence: steel ball, cast iron ball, alloy steel ball, etc. The density of different materials is different. The density of steel is larger than that of cast iron. The alloy steel varies according to the density and content of the main alloying elements.
2. Influence of steel ball manufacturing method: The rolled and forged steel balls are dense in structure, so the density is large, and the cast cast steel balls, cast iron balls or cast alloy balls are densely organized and the relative density is small.
3. Influence of metallographic structure of steel ball: The density of different crystal structures such as martensite, austenite, bainite and ferrite is also different, which also affects the crystal fineness.