In order to improve the surface quality of stainless steel pipes, that is, to reduce the energy level and reduce the number of interlayers by improving the surface morphology and morphological structure, we make stainless steel pipes that meet customer requirements. The most common surface treatment methods are as follows:
AP/CP: Pickling or passivation (Pickled & Passivated/Chemically Polished)
The pipes are pickled or passivated, which will not increase the surface roughness, but will remove the remaining particles on the surface and reduce the energy level, but will not reduce the number of interlayers.
AP is pickling treatment, which uses acidic solutions such as nitric acid and fluorinous acid to remove the oxide layer of steel pipes. Cheap and fast, but it is easy to cause grain boundary corrosion and the inner and outer surfaces are rough and easy to have suspended impurities attached.
MP: Mechanical polishing is commonly used for oxide layers, holes and scratches on the surface of steel pipes. The brightness and effect depend on the type of processing. Also after mechanical polishing.
Although it is more beautiful, it will also reduce the corrosion resistance, so it needs to be passivated when used in a corrosive environment. Moreover, there are often polishing material residues on the surface of steel pipes.
PD: mechanical drawing
Improving the surface roughness by precision cold drawing of plugs can improve the surface structure, but will not improve the morphology, energy level and number of vias. As the most basic surface treatment process, the roughness of mechanical drawing lays the foundation for other surface treatment processes.
EP: Electropolishing (Electropolishing) Electropolishing is the use of anodic treatment.
Properly adjust the voltage, current, acid composition, and polishing time by means of electrochemical principles.
Not only can it make the surface bright, smooth and clean, but it can also improve the corrosion resistance of the surface, so it is the best way to brighten the surface. Of course, its cost and technology also increase. However, because electrolytic polishing will highlight the original state of the steel pipe surface, if there are serious scratches and holes on the steel pipe surface.
BA: That is, bright annealed Bright Annealing) steel pipes will definitely need oil during the drawing process.
Grease lubrication and grain deformation due to processing. In order to avoid this grease remaining in the steel pipe.
In addition to cleaning the steel pipe, it is also possible to use argon gas to anneal at high temperature to eliminate deformation.
The atmosphere in the furnace further cleans the surface of the steel pipe by combusting argon with carbon and oxygen on the surface of the steel pipe.
The effect of producing a bright surface, so this method of using pure argon annealing heating and rapid cooling to brighten the smooth surface is called brilliant annealing, although using this method to brighten the surface can ensure that the steel pipe is fully clean and free from any external pollution. However, if the brightness of this surface is compared with other polishing methods such as mechanical, chemical, and electrolytic, it will feel like a matte surface. Of course, its effect is also related to the content of argon and the number of times of heating.
BP: Buffed Polished
The method commonly used in the decorative stainless steel industry to improve the surface brightness, although the Ra value may be very good, many cracks can be observed under the electron microscope, the actual surface area is enlarged, and there are partially separated ferrite and martensite structures. The surface is mixed with many impurities, such as abrasive particles. Due to the use of polishing paste, a lot of energy is stored in the previously obtained depression, so that the amount of media will also increase. This kind of pipeline is generally not allowed to be used in sensitive and corrosive media of microelectronics, optoelectronics and biopharmaceuticals.
AC: Anodical Cleaning
On the basis of BA, European factories carry out another surface treatment process, that is, a mild electrolytic polishing process, to reduce the surface area as much as possible and thicken the passivation film, thereby increasing corrosion resistance, improving the surface morphology and reducing energy levels. Although the product after this surface treatment method is not as bright as before, the surface quality has been greatly improved, no particles will be produced, and the composition of surface iron and iron oxide will be reduced.
Cherry
Website: www.jinyoumetal.com
Email: Cherry@jinyoumetal.com
WhatsApp/WeChat: +86 13373795593
#stainlesssteelpipe #stainlesssteeltube #weldedpipe #seamlesspipe #201pipe #304pipe #316pipe #pipefactory #pipemanufacture #polishpipe #NO1pipe #Mirrorpipe #310Stube #cheaperpipe #tubequality #stainlesssteelpipe #stainlesssteelpipes #stainlesssteelpipesupplier #stainlesssteelpipefactory #StainlessSteelPipeManufacturer #stainlesssteeltube #stainlesssteeltubes #stainlesssteeltubesupplier #stainlesssteeltubefactory #stainlesssteeltubemanufacturer #watersupply #watertransport #constructionmaterials #pipefitting #pipeline #decor #decorations #decoration #decorative
