Stainless steel welded pipe, referred to as welded pipe, commonly used steel or steel belt after the unit and mold curling welded steel pipe. The welded steel pipe has the advantages of simple production process, high production efficiency, variety specifications and low equipment investment, but the general strength is lower than that of seamless steel tube.

Since 1930s, with the rapid development of high-quality strip rolling production and progress of welding and testing technology, and constantly improve the weld quality, varieties and specifications of welded steel pipe is increasing, and in more and more fields especially in the heat exchanger tube, decorative tube, etc. in the low-pressure fluid pipe instead of the seamless steel tube.