Stainless steel seamless pipe is a long strip of steel with a hollow cross-section and no seams around it.
1. Manufacturing process and workflow of seamless steel pipes:
Smelting>Ingot>Rolling>Sawing>Peeling>Perforation>Annealing>Acid Cleaning>Ash Coating>Cold Drawing>Cutting Head>Acid Cleaning>Storage
2. Characteristics of seamless steel pipes:
From the above process flow, it is not difficult to see that: firstly, the thicker the wall thickness of the product, the more economical and practical it is, and the thinner the wall thickness, the significantly higher its processing cost; Secondly, the process of the product determines its limitations. Generally, seamless steel pipes have low precision: uneven wall thickness, low brightness of the inner and outer surfaces of the pipe, high cost of sizing, and difficult to remove pockmarks and black spots on the inner and outer surfaces; Thirdly, its detection and shaping must be processed offline. Therefore, it demonstrates its superiority in high pressure, high strength, and mechanical structural materials.
3, Welded steel pipe
Welded steel pipe, abbreviated as welded pipe, is a stainless steel pipe made by welding steel plates or steel strips after being curled and formed by a machine and a mold.
1. Steel plate>slitting>forming>welding>induction bright heat treatment>inner and outer weld treatment>shaping>sizing>eddy current testing>laser diameter measurement>pickling>storage
2. Characteristics of welded steel pipes:
From the above process flow, it is not difficult to see that: firstly, the product is produced continuously online, and the thicker the wall thickness, the greater the investment in the unit and welding equipment, making it less economical and practical. 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, welded steel pipes have high precision, uniform wall thickness, high internal and external surface brightness of stainless steel fittings (determined by the surface grade of the steel plate), and can be customized to any length. Therefore, it demonstrates its economy and aesthetics in high-precision, medium low pressure fluid applications.
There are chloride ions present in the usage environment. Chloride ions are widely present, such as salt, sweat stains, seawater, sea breeze, soil, and so on. Stainless steel corrodes rapidly in the presence of chloride ions, even surpassing ordinary low-carbon steel. So there are requirements for the use environment of stainless steel, and it needs to be regularly wiped to remove dust and maintain cleanliness and dryness.
316 and 317 stainless steel (see properties of 317 stainless steel below) are molybdenum containing stainless steel types. The molybdenum content in 317 stainless steel is slightly higher than that in 316 stainless steel Due to the presence of molybdenum in the steel, its overall performance is superior to 310 and 304 stainless steel. Under high temperature conditions, 316 stainless steel has a wide range of applications when the concentration of sulfuric acid is below 15% and above 85%. 316 stainless steel also has good resistance to chloride corrosion, so it is commonly used in marine environments. With the development of social economy, the application of stainless steel pipes has become increasingly widespread. It will undoubtedly bring about new changes in various fields.
