Stainless steel round bar falls into the category of long products and also into the category of rods. The term "stainless steel round bar" refers to long products with a uniformly circular cross-section, typically about 4 meters in length. It can be divided into bright bars and black bars. The bright bars are those with a smooth surface, resulting from a precision rolling process; while the black bars are those with a rough, black surface, produced through direct hot rolling. Stainless steel round bars are solid long strips of steel with a circular cross-section. Their specifications are indicated by the millimeter count of the diameter, such as "50" indicating a stainless steel round bar with a diameter of 50 millimeters.

Common materials include 301, 304, 303, 316, 316L, 304L, 321, 2520, 201, and 202. Specifications are indicated by diameter, such as "50" denoting a round steel with a diameter of 50mm. Round steel is categorized into three types: hot rolled, forged, and cold drawn. The specification range for hot rolled round steel is 5.5-250mm.