Stainless steel has excellent comprehensive performance, appearance and surface properties, and is widely used in all stages. Similarly, stainless steel pipes are no exception. Stainless steel pipes are a type of steel with a hollow cross-section, usually divided into seamless stainless steel pipes and welded pipes. There are some differences in processing methods and performance. The difference lies in:
1.Differences in the production process
After rolling steel plates or steel strips, stainless steel welded pipes are welded together to form equipment and molds. The inner wall of the pipe usually has welds. Seamless pipes are made from round pipe billets as raw materials and processed through hot extrusion, drilling, cold rolling and cold drawing. There are no welding points inside the pipe.
Second, the appearance differences of steel pipes
For stainless steel welded pipes, the tolerance of the wall thickness is very small, and the thickness of the entire circumference is very uniform. The steel pipe has high precision, high brightness on the inner and outer surfaces of the pipe, and the length can be set arbitrarily. The precision of seamless steel pipes is low, the wall thickness is uneven, the brightness of the inner and outer surfaces of the pipes is low, the cost of fixed dimensions is high, and there are installation problems and black spots both inside and outside. Therefore, the seamless pipes usually produced have thicker walls.
3.The difference between performance and price
Seamless pipes have higher corrosion resistance, pressure resistance and high-temperature resistance than welded pipes. With the improvement of the manufacturing process of welded pipes, their mechanical properties and performance are gradually approaching those of seamless pipes. Seamless pipes are more complex to manufacture and more expensive than welded pipes.
According to the characteristics and differences between stainless steel seamless pipes and welded pipes, to achieve the effects of economy, aesthetics and reliability, it is necessary to make a reasonable selection and application.
1.When used as decorative pipes, product pipes or support pipes, the surface effect is generally good and stainless steel welded pipes are usually required.
2.Generally, stainless steel welded pipes are used for low-pressure fluid transportation, such as water, oil, gas, air, hot water or steam, and other low-pressure systems.
3Stainless steel seamless pipes should be used in power plants, nuclear power plant boilers, high-temperature, high-pressure and high-strength requirements, high-pressure and high-pressure liquid delivery pipelines, industrial engineering and large equipment liquid delivery pipelines.
4.Stainless steel welded pipes are usually used for0.8MPaThe following liquid transportation can be handled by seamless pipes0.8MPaThe above-mentioned liquid transportation. If the pressure requirement is not high, it is more economical to use welded pipes.
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