What are the two types of steel tubes?

There are numerous types of steel tubes, but if we are referring to a broad categorization, steel tubes can generally be classified into two main types:

1. Seamless Steel Tubes: Seamless steel tubes are manufactured without any welding seams. They are made by piercing a solid cylindrical steel billet or ingot to create a hollow tube. Seamless tubes have uniform thickness throughout their length and are known for their superior strength and resistance to pressure. They are commonly used in applications where high-pressure and high-temperature conditions are involved, such as in the oil and gas industry, petrochemical plants, and power generation facilities.

2. Welded Steel Tubes: Welded steel tubes are formed by joining steel plates or coils together through various welding processes. These tubes can be produced in different shapes and sizes, including round, square, rectangular, or specialized profiles, depending on the intended application. Welded tubes are generally more cost-effective than seamless tubes and find extensive use in a wide range of industries, including construction, automotive, infrastructure, and furniture manufacturing.

It's important to note that there are numerous variations and specific types within each category, tailored for different purposes and with varying properties. These types include ERW (Electric Resistance Welded) tubes, DOM (Drawn Over Mandrel) tubes, HSS (Hollow Structural Section) tubes, and many others.