Stainless steel seamless pipe is a long steel strip with a hollow cross-section and no seams around it. Stainless steel seamless pipe is a pipe material with high corrosion resistance and high aesthetics, widely used in construction, chemical medicine, petroleum and other fields. Its definition and characteristics are as follows:
Stainless steel seamless pipe is a round, square or other shaped pipe made of stainless steel material. No welding process is used in its manufacturing process, so it has good integrity and continuity. Due to its excellent corrosion resistance and aesthetics, stainless steel seamless pipe is widely used in various fluid transportation fields, such as water supply, drainage, sewage treatment, petrochemical, medical and food.
Corrosion resistance: seamless stainless steel pipes have good corrosion resistance, especially strong resistance to chloride ions and oxidants. In corrosive media such as acid, alkaline, salt solution and seawater, its corrosion resistance is much higher than that of ordinary steel pipes.
High strength: seamless stainless steel pipes have high strength and rigidity, can withstand high pressure and gravity, and have good seismic resistance.
Aesthetics: Since no welding process is used in the manufacturing process, the surface of the seamless stainless steel pipe is smooth, without welds, and not easy to accumulate scale, so it has good aesthetics and cleanliness.
Easy maintenance: seamless stainless steel pipes have good self-cleaning properties, are not easy to accumulate scale and breed bacteria, so they are easy to maintain, and only simple cleaning and disinfection are required.
Long life: The life of seamless stainless steel pipes is long, generally more than 50 years, and during use, they will not have problems such as rust and corrosion like ordinary steel pipes.
Stainless steel seamless pipe factory usually uses steel or steel strip to be welded after curling and forming by the unit and die. The production process of welded steel pipe is simple, the production efficiency is high, the variety and specifications are many, and the equipment investment is small, but the general strength is lower than that of seamless steel pipe. Since the 1930s, with the rapid development of strip steel continuous rolling production and the progress of welding and inspection technology, the quality of welds has been continuously improved, the variety and specifications of welded steel pipes have increased day by day, and they have replaced seamless steel pipes in more and more fields, especially in heat exchange spare pipes, decorative pipes, medium and low pressure fluid pipes, etc.
Stainless steel bends can be divided into annealed bends, stamped bends and welded bends according to their production methods. Annealed bends are divided into cold annealing and hot annealing.
The size of the bend is determined by the pipe diameter, bending angle and bending radius. The bending angle is determined according to the drawings and the actual situation of the construction site, and then a sample is made, and the sample is annealed and the bending angle of the annealed pipe fittings is checked according to the sample to see if it meets the requirements. The sample can be made of round steel. The diameter of the round steel is selected according to the size of the pipe diameter to be bent, 10-14mm is enough. The bending radius of the elbow should be determined according to the pipe diameter, design requirements and relevant regulations. It should not be too large or too small. Because if the bending radius is too large, not only more materials are used, but also the area occupied by the bent part of the pipe is large, which will bring difficulties to the pipeline assembly; if the bending radius is too small, the back wall of the elbow will be thinned due to excessive elongation, so that its strength is reduced, and the inner wall of the elbow will be compressed, forming a wrinkled state.
When choosing the materials of stainless steel seamless pipes, we need to pay attention to many issues. The corrosion resistance and crevice corrosion resistance provided by stainless steel seamless pipes in use are loved by customers. Fine sand does not condense on the surface, and the color is consistent when it is just used.
The thicker the wall thickness of stainless steel seamless pipes, the more economical and practical it is. The wall thickness is uneven, the brightness of the inner and outer surfaces of the pipe is low, and the cost of fixed length is high. Stainless steel seamless pipes have demonstrated their superiority in high pressure, high strength, and mechanical structure materials.
The stainless steel seamless pipe process can be divided into hot rolling, extrusion, cold drawing and cold rolling. Chloride ions are widely present. Stainless steel seamless pipes corrode quickly in the environment where chloride ions exist, even more than ordinary low-carbon steel. The products are widely used in petrochemicals, printing and dyeing equipment, and sugar making equipment.
In short, as a high-quality pipeline material, stainless steel seamless pipes have excellent corrosion resistance, high strength, aesthetics, easy maintenance and long life, and are widely used in various fields.