1. Seamless Tubes
2. Welded Tubes
3. ERW Tubes

Seamless tubes are made by piercing a solid cylindrical billet and forcing it through a die to form a hollow tube. Since there is no welding involved, the tube is completely homogeneous, making it ideal for high-pressure applications. Seamless tubes are commonly used in the oil and gas industry and also in hydraulic systems.

ERW (Electric Resistance Welded) tubes are made by passing a high-frequency electrical current through flat steel strips that are rolled into a tube shape. The strips are then welded together using pressure and heat. ERW tubes are commonly used in the manufacturing of automobile parts, furniture, and appliances.

1. Pipe
2. Tube
3. Hollow Structural Section (HSS)
4. Square Tube
5. Rectangular Tube
6. Round Tube
7. Casing Pipe
8. Drill Pipe
9. Line Pipe

Pipe is a term used for steel tubes that are used to transport fluids and gases. Pipes are generally larger in diameter and are used for high-pressure applications. They are also used in the construction of buildings and bridges as well as in the oil and gas industry.

Square Tube is a term used for steel tubes that have a square cross-section. They are commonly used in the construction of furniture, playground equipment, and fencing.

Rectangular Tube is a term used for steel tubes that have a rectangular cross-section. They are commonly used in the construction of buildings, bridges, and other infrastructure as well as in the manufacturing of furniture and appliances.

Round Tube is a term used for steel tubes that have a circular cross-section. They are commonly used in the construction of buildings, bridges, and other infrastructure as well as in the transportation of fluids and gases.