Stainless Steel Seamless Pipe (abbreviated as seamless pipe) is a type of stainless steel pipe made by piercing or extruding solid pipe blanks, followed by cold rolling or drawing. Depending on the production method, it can be classified into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes, and extruded pipes, etc. Our company possesses cold-rolling and cold-drawing seamless pipe production units, currently producing specifications ranging from Φ6*0.5mm~Φ325*50mm, with a single production length of up to 28000mm. The materials cover austenitic, super austenitic, austenitic-ferritic duplex stainless steel, high-temperature alloys, corrosion-resistant alloys, etc. It is widely used in petrochemical, chemical, machinery manufacturing, hydropower energy, aerospace, semiconductor, nuclear power, clean energy, papermaking, shipbuilding industry, food and food machinery, and other fields.
AP = Annealing (solution treatment) + Pickling (acid washing), the initials AP represent two production processes. Pipe that have undergone “solution treatment and acid washing” are called AP pipe. Stainless steel AP pipe refers to stainless steel pipes that have been acid washed. Its corrosion resistance mainly comes from the reaction of chromium elements contained in it with oxygen, forming a dense protective layer on its surface. The role of acid washing is to allow this reaction to occur in advance, thereby improving the corrosion resistance of stainless steel pipes. During the acid washing process, oil stains and other substances attached to the surface of the pipe material during production will be removed.
During the production process of stainless steel pipes, the grease particles used for lubrication may deform due to production and processing. To minimize residual grease in stainless steel pipes, the annealing process reasonably adopts high temperature, and the furnace atmosphere is argon. By combining argon with carbon and oxygen on the surface of the stainless steel pipe to burn, the surface of the stainless steel pipe is further cleaned, creating a bright effect. This method of using pure argon for annealing heating and rapid cooling to make the smooth surface shine is called bright annealing. Although this method of surface brightening can keep the stainless steel pipe clean and free from any external contamination, if compared with other polishing methods such as mechanical, chemical, electrolytic, etc., it will have a matte feel.
Polishing wheels or belts use abrasives in the polishing agent to grind and polish the surface of stainless steel pipes, achieving a smooth and polished effect. Its brightness depends on the type of processing technology. Additionally, while mechanical polishing is more aesthetically pleasing, it can also reduce corrosion resistance.
Electropolishing is an anodic treatment method. Based on electrochemical principles, appropriate adjustments of voltage, current, acid composition, and polishing time can not only make the surface bright, smooth, and clean but also enhance the durability of the surface. It is corrosive, so achieving a shiny surface is a good method, although it does increase costs and technical requirements significantly.
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