The welded pipe is called the welded pipe for short, and the commonly used steel or steel strip is welded by the curled forming of the unit and the mold. The welding steel pipe production process is simple, the production efficiency is high, the variety specification is many, the equipment investment is few, but the general strength is lower than the seamless steel pipe. 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 pipe, who spare decorative tube, tube for low-pressure fluid etc. instead of the seamless steel tube.

First, the small caliber stainless steel welded pipe is continuous online production. The thicker the wall is, the greater the investment will be for the unit and the melting equipment. The less economical and practical it is. The smaller the wall thickness is, the lower the input output ratio will be; the next is the technology of the product, which determines its advantages and disadvantages. The general welded steel pipe has high accuracy, uniform wall thickness, high brightness inside and outside the tube (the surface brightness of the steel plate determines the surface brightness of the steel tube), and it can be arbitrarily fixed. Therefore, it embodies its economy and beauty in the application of high precision, medium and low pressure fluid.

According to the form of weld, it is divided into straight welded pipe and spiral welded pipe.

Dividedagain general pipe, heat exchanger pipe, condenser pipe, galvanized pipe, blowing pipe, wire tube, pipe metric, roller tube, deep well pump, tube for automobile, transformer tube, welding, welding of thin-walled tube shaped tube and spiral welded pipe

GB/T12770-2002 (stainless steel welded steel pipe for mechanical structure). It is mainly used for the decoration of machinery, automobile, bicycle, furniture, hotel and hotel and other mechanical parts and structural parts. It represents the material 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb and so on.

GB/T12771-2008 (stainless steel welded steel pipe for fluid delivery). It is mainly used for conveying low pressure corrosive medium. The representative materials are 06Cr19Ni10, 022Cr19Ni10, 06Cr19Ni110Ti, 00Cr17, 0Cr18Ni11Nb, 06Cr17Ni12Mo2 and so on.