The concept of
stainless steel pipe: it is a hollow long strip of steel, which is widely used as a pipeline for transporting fluids, such as oil, natural gas, water, gas, steam, etc. In addition, when bending and torsional strength are the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. It is also commonly used to produce various conventional weapons, barrels, shells, etc. Application of stainless steel pipe: stainless steel pipe is safe and reliable, hygienic and environmentally friendly, economical and applicable, the thin wall of the pipe and the successful development of a new reliable, simple, and convenient connection method make it have more irreplaceable advantages of other pipes, and the application in engineering There will be more and more, the user will become more and more popular, and the prospect is promising.
Stainless steel pipe material: 201 (1Cr17Mn6Ni5N), 202 (1Cr18Mn8Ni5N), 301 (1Cr17Ni7), 302 (1Cr18Ni), 304 (0Cr18Ni9), SS304, TP304 304L (00Cr19Ni10), SS304L, TP304L 321 (16Cr18Ni13TP, 321TP, 321Ti), SS32 (0Cr17Ni12Mo2), SS316, TP316 316L (0Cr17Ni14Mo2), SS316L, TP316L 310S (0Cr25N20), SS310S, TP310S
Classification of stainless steel pipes:
1. Classification by production method
(1) Seamless pipe——cold-drawn pipe, extruded pipe, cold-rolled pipe Stainless steel seamless pipe is a long strip of steel with a hollow section and no joints around it.
The manufacturing process and flow of seamless steel pipes: smelting>steel ingot>steel rolling>sawing>peeling>perforation>annealing>pickling>ashing>cold drawing>cutting>pickling>warehousing
The characteristics of seamless steel pipe: First, the thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, its processing cost will increase significantly; Secondly, the process of the product determines Its limitations, generally seamless steel pipes have low precision: uneven wall thickness, low brightness inside and outside the tube, high cost of cutting to length, and there are pits on the inside and outside, and black spots are not easy to remove; Third, its detection and shaping must Process offline. Therefore, it embodies its superiority in terms of high pressure, high strength, and mechanical structural materials.
(2) Welded pipe:
(a) Classification by process - gas-shielded welded pipe, arc welded pipe, electric resistance welded pipe (high frequency, low frequency)
(b) Classification by weld seam - straight seam welded pipe, spiral welded pipe Stainless steel welded steel pipe: Welded steel pipe is referred to as welded pipe for short.
The manufacturing process and flow of welded steel pipe: steel plate > slitting > forming > melting > induction bright heat treatment > internal and external weld bead treatment > shaping > sizing > eddy current testing > laser sizing > pickling > storage
Features of welded steel pipe: First, the product is produced continuously online, the thicker the wall thickness, the greater the investment in the unit and welding equipment, and the less economical and practical it is. The thinner the wall thickness, the lower its 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, and high brightness inside and outside the pipe (the steel pipe is determined by the surface grade of the steel plate) Surface brightness), and can be arbitrarily scaled. Therefore, it embodies its economy and aesthetics in high-precision, medium- and low-pressure fluid applications.
2. Classified by section shape (1) Round steel pipe (2) Rectangular pipe
3. Classification by wall thickness (1) thin-walled steel pipe (2) thick-walled steel pipe
