Differences between nickel-based alloy pipes and welded pipes
1. Differences in the production process
After rolling the steel plate or steel strip, the stainless steel welded pipe is welded to produce equipment and molds. The inner wall of the pipe generally has a weld. The seamless pipe uses round pipe billets as raw materials, and is punched, cold rolled, and cold drawn through a hot extrusion production process. There are no welding points in the pipe.
2. Differences in the appearance of steel pipes
For nickel-based alloy pipes, the thickness tolerance is very small, and the thickness of the entire circumference is very uniform. The steel pipe has high precision, high brightness on the inside and outside surfaces of the pipe, and the length can be set arbitrarily. The seamless pipe has low precision, uneven thickness, low brightness on the inside and outside surfaces of the pipe, high cost of fixed size, and installation and black spots inside and outside. Therefore, the wall of the seamless pipe produced is generally thicker.
3. Differences between performance and price
Seamless pipes have stronger 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 complicated in the manufacturing process and more expensive than welded pipes.
According to the characteristics and differences of stainless steel seamless pipes and welded pipes, to achieve economic, beautiful and reliable effects, it is necessary to choose the application reasonably.
1. When used as decorative pipes, commodity pipes, and support pipes, the surface effect is generally good, and stainless steel welded pipes are generally required;
2. Generally, stainless steel welded pipes are used for low-pressure liquid transportation, such as water, oil, gas, gas, hot water or steam and other low-pressure systems.
3. Power stations, nuclear power plant boilers, high temperature, high pressure, high strength requirements, high pressure, high pressure infusion pipelines, industrial engineering and large equipment infusion pipelines, stainless steel seamless pipes should be used. .
4. Stainless steel welded pipes are generally used for liquid transportation below 0.8MPa, while seamless pipes can withstand liquid transportation above 0.8MPa. If the pressure requirement is not high, it is more economical to use welded pipes.
