A circular steel pipe, also known as a round steel pipe, is a type of hollow, cylindrical tube that is made from steel. It is formed by rolling a steel strip or plate into a cylinder and welding the edges together to create a continuous seam. The resulting tube has a circular cross-section and can be used in a variety of industrial and construction applications.

Circular steel pipes are commonly used for transporting fluids and gases, such as water, oil, and natural gas. They are also used in the construction of buildings and structures, such as bridges, scaffolding, and fencing. In addition, circular steel pipes can be used in the manufacturing of various mechanical components, such as automotive parts and machinery.

Circular steel pipes come in a range of sizes and thicknesses and can be made from different grades of steel depending on the requirements of the specific application. They can also be galvanized or coated with other protective materials to enhance their resistance to corrosion and weathering.