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Classification and application of stainless steel water pipe

Author:     Date: March 13, 2019    Source:    Focus on:

1、 Classification of stainless steel tubes   
    1. Classification by production method:   
  ( 1) Seamless tube - cold drawn tube, extruded tube, cold rolled tube.   
  ( 2) Welded pipe:   
     ( a) Classification by process - gas shielded welded pipe, arc welded pipe, resistance welded pipe (high frequency, low frequency).   
     ( b)   According to the welding seam, it is divided into longitudinal welded pipe and spiral welded pipe.   
    2. According to the shape of section: (1) round steel tube( 2) Rectangular tube.   
    3. Classification by wall thickness - thin wall steel pipe, thick wall steel pipe   
    4. According to their uses: (1) civil pipes are divided into round pipes, rectangular pipes and flower tubes, which are generally used in decoration, architecture and structure;   
  ( 2) Industrial pipe: steel pipe for industrial piping, steel pipe for general piping (drinking water pipe), mechanical structure / fluid transmission pipe, boiler heat exchange pipe, food hygiene pipe, etc. It is generally used in various fields of industry, such as petrochemical, papermaking, nuclear energy, food, beverage, medicine and other industries, which have high requirements for fluid medium.   
2、 Seamless steel pipe   
    Stainless steel seamless steel pipe is a kind of long steel with hollow section and no joint around.   
    1. Manufacturing process and process of seamless steel pipe:   
    Smelting > ingot > rolling > sawing > peeling > perforation > annealing > pickling > ash loading > Cold Drawing > cutting head > pickling > warehousing   
    2. Features of seamless steel pipe:   
    It is not difficult to see from the above process flow: first, the thicker the wall thickness of the product, the more economical and practical it will be. The thinner the wall thickness is, the higher the processing cost will be; Secondly, the process of the product determines its limitations. Generally, the precision of seamless steel pipe is low: the wall thickness is uneven, the surface brightness inside and outside of the pipe is low, the cost of sizing is high, and there are pockmarks and black spots on the internal and external surface, which are not easy to remove; Third, its detection and shaping must be processed offline. Therefore, it shows its advantages in high pressure, high strength and mechanical structure materials.   
3、 Welded steel pipe   
    Welded steel pipe is referred to as welded pipe, which is made of steel plate or steel strip after crimping and forming by machine and mould.   
    1. Steel plate > strip > forming > solution welding > induction bright heat treatment > internal and external weld bead treatment > shaping > sizing > Eddy Current Testing > laser diameter measurement > pickling > warehousing   
    2. Features of welded steel pipe:   
    From the above process flow, it is not difficult to see: first, the product is continuous on-line production, the thicker the wall, the greater the investment of the unit and solution welding equipment, the less economical and practical it is. The thinner the wall thickness is, the lower the input-output ratio will be; Secondly, the process of the product determines its advantages and disadvantages. Generally, the welded steel pipe has high precision, uniform wall thickness, high surface brightness inside and outside the pipe (the surface brightness of the steel pipe determined by the surface grade of the steel plate), and the length can be arbitrarily determined. Therefore, it is economical and beautiful in the application of high precision, medium and low pressure fluid.  

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