There are many kinds of stainless steel pipes, but their main uses are as follows: 1. Classification of stainless steel pipes, 1. Classification by production mode: (1) Seamless pipes-cold drawn pipes, extruded pipes and cold rolled pipes. (2) Welded pipes: (a) According to the process classification-gas shielded welded pipes, arc welded pipes and resistance welded pipes (high frequency and low frequency). (b) According to the weld-straight welded pipe and spiral welded pipe. 2. According to the section shape, it is classified as (1) circular steel pipe; ② Rectangular tube. 3, according to the wall thickness classification-thin-walled steel pipe, thick-walled steel pipe. 4. Classification by use: (1) Civil pipelines are divided into round pipes, rectangular pipes and flower pipes, which are generally used for decoration, architecture and structure; (2) Industrial pipes: steel pipes for industrial water distribution pipes, steel pipes for main water distribution pipes (drinking water pipes), mechanical structure/fluid conveying pipes, boiler heat exchange pipes, food hygiene pipes, etc. It is generally used in various fields of industry, such as petrochemical industry, paper making, nuclear energy, food, beverage, medicine and other industries with high requirements for fluid media. Second, seamless steel pipe, stainless steel seamless pipe is a kind of long steel with hollow cross section and no seams around it. 1. seamless steel pipe manufacturing process and flow: smelting >; Ingot > steel rolling > sawing > peeling > perforation > annealing > pickling > ash removal > cold drawing > cutting head > pickling > warehousing. 2. Features of seamless steel pipe: It is not difficult to see from the above technological process: firstly, the thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, the higher its processing cost; Secondly, the technology of this product determines its limitations. Generally, the precision of seamless steel pipe is low: the wall thickness is uneven, the brightness of the inner and outer surfaces of the pipe is low, the cut-to-length cost is high, and the pits and black spots on the inner and outer surfaces are difficult to remove; Third, its detection and shaping must be done off-line. Therefore, it shows its advantages in high pressure, high strength and mechanical structure materials. 3. Welded steel pipe, referred to as welded steel pipe for short, is a stainless steel pipe made of steel plate or steel strip after being pressed and formed by a unit and a die. 1. steel plate >; Stripping > forming > fusion welding > induction bright heat treatment >: internal and external weld bead treatment > shaping > sizing > eddy current testing > laser sizing > pickling > warehousing. 2. Characteristics of welded steel pipes: From the above technological process, we can easily see that: firstly, the products are continuously produced online, and the thicker the wall thickness, the greater the investment of the unit and welding equipment, and the less economical and practical it is. The thinner the wall thickness, the lower the input-output ratio. Secondly, the technology of this product determines its advantages and disadvantages. Generally, welded steel pipes have high precision, uniform wall thickness and high brightness inside and outside stainless steel pipe fittings (the surface brightness of steel pipes is determined by the surface grade of steel plates), and can be cut at any length. Therefore, it is economical and beautiful in the application of high-precision, medium and low-pressure fluids. For more information, please consult Shenyang Tengda Stainless Steel Co., Ltd., thank you!