What are stainless steel seamless pipes and their characteristics?
Stainless Steel Seamless Pipe is a long steel material with a hollow cross-section and no seams around it. The thicker the wall thickness of the product, the more economical and practical it is. The thinner the wall thickness, the processing cost will increase significantly.
The process of the product determines its limited performance. Generally, smls steel pipes have low precision: uneven wall thickness, low brightness on the inside and outside of the tube, high cost of cutting to length, and pitting and black spots on the inside and outside that are difficult to remove. Its detection and shaping must be processed offline. Therefore, it reflects its superiority in terms of high pressure, high strength, and mechanical structural materials.
What is the manufacturing method of stainless seamless steel pipe?
According to different production methods, it can be divided into hot rolled tubes, cold rolled tubes, cold drawn tubes, extruded tubes, etc.
1. Hot rolled stainless seamless pipe are generally produced on automatic pipe rolling units.The solid tube blank is inspected and surface defects are removed, cut into the required length, centered on the perforated end of the tube blank, then sent to the heating furnace for heating, and pierced on the punching machine. It continues to rotate and advance during piercing holes. Under the influence of the rollers and the end, the tube blank is hollow gradually, which is called gross pipe. Then it is sent to the automatic pipe rolling machine to continue rolling. Finally, the wall thickness is evened by the leveling machine, and the size is determined by the sizing machine to meet the specification requirements. It is a more advanced method to use continuous pipe rolling units to produce hot rolled seamless steel pipes.
2. If you want to obtain seamless pipes with smaller size and better quality, you must use cold rolling, cold drawing or a combination of both. Cold rolling is usually carried out on a two-roll mill. The steel pipe is rolled in an annular pass composed of a variable cross-section circular groove and a fixed conical head. Cold drawing is usually performed on a 0.5 to 100T single-chain or double-chain cold drawing machine.
3. The extrusion method is to place the heated tube blank in a closed extrusion cylinder, and the perforation rod and the extrusion rod move together to make the extrusion part extruded from the smaller die hole.
What matters should be paid attention to during storage of stainless steel seamless pipes?
Generally, we should take protective and maintenance measures for stainless steel seamless pipes stored for a long time to ensure their service life. Let’s learn about some matters during the storage of stainless steel seamless pipes.
1. Stainless steel seamless pipes should be protected from direct light after being filmed. If the film deteriorates during storage, it should be replaced immediately (the film has a lifespan of 6 months)
2. If the padding paper accidentally soaks the packaging material, the padding paper should be removed immediately to avoid corrosion of the pipe.
3. When storing stainless steel seamless pipes, attention should be paid to moisture, dust, oil, lubricants, etc. to avoid long-term contact that may cause rust and performance degradation.
4. Stainless steel seamless pipes should be stored in a clean and easily ventilated place. They should also keep their original packaging and cannot be easily opened. They should be well protected.
Read more: Seamless Steel Pipe Storage Place and Precautions
