1. The difference in production process
Stainless steel welded pipe is welded by steel plate or steel strip after curling and forming by the unit and mold, and the inner wall of the pipe generally has a weld; The seamless pipe uses round pipe blank as raw material for perforation, and is made by cold rolling, cold drawing or hot extrusion production process, and there are no welding points on the pipe.
2. The difference in the appearance of steel pipes
Stainless steel welded pipe, its wall thickness tolerance is very small, the wall thickness of the entire circumference is very uniform; The steel pipe has high precision, high brightness on the inner and outer surfaces of the tube, and can be arbitrarily fixed; Can make thin-walled tubes. The steel pipe of seamless pipe has low accuracy, uneven wall thickness, low brightness on the inner and outer surfaces of the tube, high cost of sizing, and pockmarks and black spots on the inner and outer surfaces that are not easy to remove. Therefore, the seamless pipe walls are usually produced.
3. The difference in performance and price
Seamless pipes are much higher than welded pipes in terms of corrosion resistance and pressure and high temperature resistance. With the improvement of welded pipe manufacturing process, mechanical properties and mechanical properties are slowly approaching seamless pipe. Seamless pipe is more complicated in the production process, and its price is more expensive than welded pipe.
