Seamless stainless steel tube, also known as stainless steel seamless tube, is made of steel ingot or solid tube blank after perforation and then hot rolling, cold rolling or cold drawing.
Stainless steel welded pipe is made of stainless steel plate.
2. welding.
304 stainless steel welded pipe for decoration is welded due to the pipe-making process, while seamless steel pipe, as its name implies, has no weld. High-quality decorative stainless steel welded pipe, all welds are protected by nitrogen.
3. thickness.
After calendering, the original steel strip of stainless steel welded pipe has a relatively uniform thickness. Welded pipe products include thin pipe and thick pipe. However, the thickness of stainless steel seamless pipes is often uneven, and they are relatively thick pipes.
4. Weldability.
Generally speaking, there are some differences in chemical composition between 304 seamless stainless steel pipe and seamless stainless steel pipe. The steel composition of seamless stainless steel pipe only meets the basic requirements of astm. For the steel used to produce welded stainless steel pipes, it contains a certain proportion of chemical components suitable for welding, such as silicon, sulfur, manganese, oxygen, ferrite, etc., which can produce flux that is easy to transfer heat during welding, thus making the whole weld penetration. However, the seamless stainless steel pipe, due to the lack of the above elements, will produce various unstable factors in the welding process, which is not easy to weld firmly and completely.
4. Corrosion resistance.
Generally speaking, the corrosion resistance of two kinds of stainless steel pipes and seamless pipes of the same material is basically the same.
5. price.
The price of seamless steel pipe is higher than that of welded stainless steel pipe.
6. Comprehensive quality
Generally speaking, the quality of 304 seamless stainless steel pipe is better than that of seamless stainless steel pipe. This is because the welded stainless steel pipe is a precision cold-rolled plate that has been tested, so the defects are basically in the welding place. However, 304 seamless stainless steel pipe is stamped from stainless steel blank, which leads to many tearing phenomena on the extruded pipe wall. Eddy current testing shows that the defect rate of seamless stainless steel pipe is usually lower than that of seamless stainless steel pipe.
6. surface.
Seamless pipe surface requirements are not strict, there will be less obvious spots. The surface treatment requirements of stainless steel decorative pipes are strict.
7. use.
Seamless pipes are mainly industrial pipes. Decorative pipes are widely used, mainly in the field of decorative welding. However, with the improvement of decorative stainless steel pipes, thick-walled decorative pipes are also used to replace some seamless steel pipes.