一、Different pipe making processes
Seamless pipe, also known as stainless steel seamless pipe, is a tube made of cast billet or solid tube billet after perforation, hot rolled, cold rolled or cold drawn. Welded stainless steel pipes are made of stainless steel.
二、 the difference in welding
The process of welding the decorative pipe with 304 stainless steel can be seen that the pipe is welded, but the seamless steel pipe and its name are not welded. High quality decorative stainless steel welded pipe, full nitrogen internal protection weld.
三、 the thickness of the two is different
The raw material steel strip of the original stainless steel welded pipe is calendered, the thickness is relatively uniform, and the finished welded pipe specifications are thin tubes with thick tubes. However, the stainless steel seamless pipe is generally uneven in thickness, and the steel pipe is relatively thick.
四、 the two welding process performance is different
Generally, 304 stainless steel welded pipes and seamless stainless steel pipes have certain differences in chemical composition. The steel composition of seamless steel pipe only meets the basic requirements of steel pipe. In addition, for the production of welded stainless steel steel, the chemical composition of the steel is suitable for welding, such as silicon, sulfur, manganese, oxygen and ferrite and other elements are mixed in a certain proportion, which can produce a heat-transfer welding melt during the welding process, so that the entire weld is completely welded through. Stainless steel seamless pipe, due to the lack of the above elements, in the welding process will produce a variety of unstable factors, it is difficult to weld and weld through.
五， corrosion resistance and price difference
The corrosion resistance of the two stainless steel pipes and seamless pipes of the same material is basically the same. The price of seamless steel pipe is higher than that of stainless steel welded pipe.
六，Use and comprehensive performance
Seamless pipes are mainly used in industrial fields. Decorative pipes are widely used, mainly in the field of decorative welding, but with the improvement of decorative pipe technology, thick wall decorative pipes can also replace a part of seamless pipes. Under normal circumstances, the quality of 304 slot stainless steel pipe is better than that of stainless steel seamless. Because welded stainless steel pipes are inspected by precise cold-rolled steel plates, the defects are basically welded out. The 304 stainless steel pipe is made of stainless steel billet by stamping and stamping forming, which produces many tearing phenomena on the tube wall formed by extrusion. Vortex flow test shows that the secondary rate of welded stainless steel pipe fittings is generally lower than that of seamless stainless steel pipe fittings.
