1. Production Process
Welded pipe used the steel plate or steel strip as raw material, and it is welded after being crimped by the unit and mold. According to different welding methods, it can be divided into straight seam welded pipe and spiral welded pipe. While seamless steel pipe is made by cold rolling, cold drawing or hot extrusion production process using round steel perforation as raw material.

2. Outer Surface
Welded steel pipe has high precision, uniform wall thickness, high brightness inside and outside the pipe, and can be arbitrarily cut to length; it can be used as a thin-walled pipe. While Seamless steel pipe has low precision, uneven wall thickness, low brightness on the inside and outside of the pipe, high cost of sizing, and there are pitting and black spots on the inside and outside that are not easy to remove. Usually, the pipe wall is thick.

3. Performance
Seamless steel pipes perform better than welded pipes in the aspect of corrosion resistance and pressure and high-temperature resistance. With the improvement of welded pipe manufacturing technology, the mechanical properties and mechanical properties are slowly approaching seamless pipes. In some aspects, welded pipes can replace seamless pipes.

4. Price
The production process of seamless steel pipe is more complicated, and its price is more expensive than welded pipe.

5. Application
Seamless steel pipe has a hollow section and is used as a pipeline for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water, and certain solid materials. I t is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile transmission shafts, bicycle frames, and steel scaffolding used in construction. Steel pipes are used to make ring parts, which can improve material utilization, simplify manufacturing procedures, and save materials and processing. Working hours. Welded pipes’ pressure-bearing performance in general, mainly used to transport water, oil, gas, air, and heating water or steam and other generally lower pressure fluids.