Differences between seamless and welded stainless steel pipes

December 22, 2023
Latest company news about Differences between seamless and welded stainless steel pipes

1、 Differences in the production process

After rolling steel plates or strips, stainless steel welded pipes are welded together to form equipment and molds. The inner wall of the pipe usually has welds, and seamless pipes are made from round pipe blanks and drilled, cold rolled, and drawn through hot extrusion production processes. There are no welding points inside the pipe.

2、 Appearance differences of steel pipes

For stainless steel welded pipes, the tolerance for wall thickness is very small, and the thickness of the entire circumference is very uniform. The steel pipe has high precision, high brightness on the inner and outer surfaces, and the length can be set arbitrarily. The precision of seamless steel pipes is low, the wall thickness is uneven, the brightness of the inner and outer surfaces of the pipes is low, the cost of fixing dimensions is high, and the installation and black spots inside and outside are also included. Therefore, usually produced seamless pipes have thicker walls.

3、 The difference between performance and price

Seamless pipes have higher corrosion resistance, pressure resistance, and high temperature resistance than welded pipes. With the improvement of the manufacturing process of welded pipes, the mechanical properties and mechanical properties are gradually approaching those of seamless pipes. Seamless pipes are more complex in the manufacturing process and more expensive than welded pipes.

According to the characteristics and differences between stainless steel seamless pipes and welded pipes, in order to achieve economic, aesthetic, and reliable results, it is necessary to choose reasonable applications.

When used as decorative pipes, product pipes, and support pipes, the surface effect is generally good, and stainless steel welded pipes are generally required;

Usually, stainless steel welded pipes are used for low-pressure fluid transportation, such as water, oil, gas, air, hot water or steam, and other low-pressure systems.

3. Stainless steel seamless pipes should be used for power plants, nuclear power plant boilers, high-temperature, high-pressure, high-strength requirements, high-pressure, high-pressure infusion pipelines, industrial engineering, and large-scale equipment infusion pipelines.

4. Stainless steel welded pipes are usually used for liquid transportation below 0.8MPa, while seamless pipes can withstand liquid transportation above 0.8MPa. If the pressure requirement is not high, using welded pipes is more economical.