① Material density influence: Steel balls, cast iron balls, alloy steel balls, etc. The density of different materials varies. The density of stainless steel ball steel for valves is higher than that of cast iron, while alloy steel varies depending on the density and content of the main alloying elements.

② The influence of steel ball manufacturing methods: The microstructure of rolled and forged steel balls is dense, resulting in high density. The microstructure of cast steel balls, cast iron balls, or cast alloy balls is not very dense, and even has pores, resulting in lower density.

③ The influence of steel ball metallographic structure: The density of martensite, austenite, bainite, ferrite and other different crystal structures in bearing stainless steel balls also varies, and it also has an impact on the crystal fineness.

④ Chemical composition element influence: Due to the different chemical components such as iron, carbon, chromium, manganese, sulfur, phosphorus, etc. contained in the finished steel ball, it has varying degrees of influence on the hardness and impact wear of the steel ball. Generally speaking, if the chromium content is high, the wear resistance of the steel ball is high.