The difference between seamless steel pipe and seamed steel pipe

　　Seamless steel pipes are mainly used as pipelines or structural parts for conveying fluids, mainly in the machinery industry, and seamed steel pipes are mainly used in the construction industry, such as water, gas, compressed air and other low-pressure fluids.

　　What are the uses and differences between seamless steel pipes and seamed steel pipes?

　　1. Different appearance: The inner wall of the welded joint of seamed steel pipes generally has steel bars, while the inner wall of the welded joint of seamless steel pipes generally has no welding bars.

　　2. Different pressures: The pressure of seamed steel pipes is generally more than 1.6 MPa, while the pressure of seamless steel pipes is generally more than 7 MPa.

　　3. Different uses: Seamed steel pipes can be used to transport low-pressure fluids, such as gas, water, etc., so they are often used in the construction industry. Seamless steel pipes can not only be used to transport liquids, but can also be used as structural parts, so they are often used in the machinery industry.

　　4. Different processes: Seamed steel pipes need to be rolled first and then welded. Seamless steel pipes are produced in one go using rolling technology.

　　2. What are seamed steel pipes and seamless steel pipes?

　　1. Seamed steel pipe:

　　Seamed steel pipe is also called welded steel pipe. It is made of carbon steel that is easy to weld. It is generally named by its nominal size. The commonly used nominal sizes are DN15 to DN100, and DN150 is the largest. Nominal diameter. Slit steel pipes are often used to transport low-pressure fluids such as gas, cold water, and hot water. For this reason, they are also called gas pipes, water pipes, etc.

　　2. Seamless steel pipe:

　　Seamless steel pipes are made from the entire round steel through perforations, and there are generally no welds on the surface. There are many types of seamless steel pipes, such as jacked pipes, cold drawn pipes, cold rolled pipes, hot rolled pipes, extruded pipes, etc. If classified according to the cross-sectional shape, they can also be divided into two types, namely special-shaped tubes, circular tubes, special-shaped tubes can also be divided into a variety of complex shapes, such as: star-shaped tubes, square tubes, oval tubes, triangular tubes, hexagonal tubes, etc. If classified according to use, they can be divided into two types, namely thin-walled tubes and thick-walled tubes.