1. Classification by production method
(1) seamless tube - cold drawn tube, extruded tube, cold rolled tube
Stainless steel seamless steel pipe is a kind of long steel with hollow section and no joint around.
Manufacturing craft and process of seamless steel pipe: smelting > ingot > rolling > sawing > peeling > piercing > annealing > pickling > ash loading > Cold Drawing > cutting head > pickling > warehousing
Characteristics of seamless steel pipe: from the above process, we can see that: first, the thicker the wall thickness of the product, the more economical and practical it will be, and the thinner the wall thickness, the higher the processing cost will be; second, the process of the product determines its limitations, and the general accuracy of seamless steel pipe is low: the wall thickness is uneven, the brightness of the inner and outer surface of the pipe is low, and the sizing cost is high, and the inner and outer surface also have Pockmarks and black spots which are not easy to remove; third, their detection and shaping must be processed offline. Therefore, it shows its advantages in high pressure, high strength and mechanical structure materials.
Classification and characteristic analysis of stainless steel pipe
(2) welded pipe
Classification by process - gas shielded welded pipe, arc welded pipe, resistance welded pipe (high frequency, low frequency
According to the weld seam - straight welded pipe and spiral welded pipe
Manufacturing craft and process of welded steel pipe: steel plate > slitting > forming > solution welding > induction bright heat treatment > internal and external weld bead treatment > shaping > sizing > Eddy Current Testing > laser diameter measurement > pickling > warehousing
Characteristics of welded steel pipe: from the above process, we can see that: first, the product is continuous online production, the thicker the wall, the greater the investment of the unit and the fusion equipment, the less economical and practical it is. The thinner the wall thickness is, the lower the input-output ratio will be; secondly, the advantages and disadvantages of the product are determined by the process of the product. Generally, the welded steel pipe has high precision, uniform wall thickness, high internal and external surface brightness (the surface brightness of the steel pipe is determined by the surface grade of the steel plate), and it can be customized for any size. Therefore, it embodies its economy and beauty in the application of high precision, medium and low pressure fluid.
2. Classification by section shape: circular steel pipe, rectangular pipe
3. Classification by wall thickness: thin wall steel pipe, thick wall steel pipe, stainless steel pipe
4. Classification by purpose
(1) civil pipe: divided into round pipe, rectangular pipe and floral pipe, generally used for decoration, construction, structure and other aspects
(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. Generally used in various fields of industry, such as petrochemical, paper, nuclear energy, food, beverage, medicine and other industries, which have high requirements for fluid medium.
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