Steel hollow bar is a kind of metal bar with hollow middle section, often made of carbon steel and alloy steel. This bar is often used in mechanical manufacturing to make lightweight, high-strength parts, such as fan blades.
Its light weight and ease of processing and transportation make it more suitable than solid steel rods in some application scenarios. However, due to the cavity in its interior, its performance may not be as stable as that of solid steel rods in the case of strong force or high pressure.