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+--- Thread: Stainless Steel Pipe Types (/showthread.php?tid=428)
Stainless Steel Pipe Types - ttaa003 - 09-02-2021
Stainless steel is a versatile material comprised of a steel alloy and a small percentage of chromium — the addition of chromium adds to the material’s corrosion resistance, a trait that earned stainless steel its name. Because stainless steel is also low-maintenance, oxidation resistant, and doesn’t affect other metals it comes in contact with, it is frequently used in a large array of applications, especially in piping and tubing manufacturing. Based on the end use of the pipe, stainless pipe is broken down into several categories.
Stainless tube general category of steel is appropriate for applications that require corrosion resistance above other traits. Ferritic or martensitic types of steel (those made with the most chromium) are manufactured to be either heat-treated or annealed. Austenitic Stainless steels (those with high chromium and nickel contents) offer even more resistance, and can be used under the same general conditions as ferritic and martensitic types.
AP pipe, or Acid Pickling, uses acidic solutions such as nitric acid and fluorine acid to
Remove the oxide layer of the steel pipe. Cheap and fast, but easy to cause grain boundary corrosion and rough inner and outer surfaces
The roughness is easy to have suspended impurities attached. AP literally means pickling surface, and in the category of clean products, it means pickling surface + oil-free cleaning
MP Tube-Mechanically Polished Pipe
MP tube : Mechanical polishing is often used for the oxide layer on the surface of steel pipes,
The brightness and effect of holes and scratches depend on the type of processing method. In addition, after mechanical polishing
Although it is more beautiful, it will reduce the corrosion resistance, so when used in a corrosive environment, it needs to be passivated.
reason. And there are often polishing material residues on the surface of the steel pipe
BA tube-Bright Annealed Pipe Bright Annealed Pipe BA is the bright annealing Bright Annealing steel pipe in the process of drawing will definitely need grease lubrication and the grain will also be deformed due to processing. In order to avoid this grease remaining in the steel pipe, in addition to cleaning the steel pipe, you can also use high temperature annealing at high temperature to eliminate deformation, using argon as the furnace atmosphere, and further clean the steel pipe by combining argon with the carbon and oxygen on the surface of the steel pipe. The surface has a bright surface effect, so this method of using pure argon annealing to heat and quickly cool to brighten the bright surface is called bright annealing. Although the use of this method to brighten the surface can ensure that the steel pipe is fully clean and free of any external pollution. However, if the brightness of this surface is compared with other polishing methods mechanical, chemical, and electrolytic, it will feel like a matte surface. Of course, the effect is also related to the argon content and the number of heating times.
EP tube ElectroPolished Pipe (EP 0 (Electro Polishing) Electropolishing is the use of anodizing method to appropriately adjust the voltage, current, acid composition, and polishing time through the principle of electrochemistry. Not only can the surface become bright, Smooth and clean effect 0 can also improve the surface corrosion resistance, so it is the best surface brightening method, of course, its cost and technology also increase. However, because electrolytic polishing will highlight the original state of the steel pipe surface, if the steel pipe surface has serious scratches and holes.