![]() ![]() If the seam pipe adopts the minimum cold treatment, the grain size of the weld is smaller than the grain size of the welded metal, otherwise, the grain size is the same. The grain size of the annealed seamed stainless steel tube and seamless stainless steel tube are the same. The grain size of the metal is related to the heat treatment temperature and the time to maintain the same temperature. Steel pipes lacking the above chemical composition, such as seamless pipes, will produce various unstable factors during the welding process, and are not easy to weld firmly and incompletely. Seamless pipe: The steel composition of the seamless tube is only the basic requirement of astm. For example, the mixing of elements such as silicon, sulfur, manganese, oxygen, and triangular ferrite in a certain proportion can produce a weld melt that is easy to transfer heat during the welding process, so that the entire weld can be penetrated. ![]() The steel for the production of seamed pipes contains a chemical composition suitable for welding. Stainless steel welded pipe: due to differences in material chemical composition. The steel pipe has low precision, uneven wall thickness, low brightness on the inside and outside of the pipe, high cost of sizing, and there are pits and black spots on the inside and outside that are not easy to remove, so astm allows the wall thickness difference of seamless pipes than that of seamed pipes The difference is large, usually the pipe wall is thicker. In this way, the wall thickness of the pipeline is uneven and the eccentricity is high. At this high temperature, the tool steel becomes soft and spirals out of the hole after punching and drawing. Seamless pipe: The manufacturing process of seamless steel pipe is to punch a hole in a stainless steel billet at a temperature of 2200°f. The steel pipe has high precision, uniform wall thickness, high brightness inside and outside the pipe (the surface brightness of the steel pipe is determined by the surface grade of the steel plate), can be arbitrarily fixed length, and can be used as a thin-walled pipe. The tolerance of the wall thickness of the slotted pipe is very small, and the wall thickness is very uniform throughout the circumference. The steel plate is cut to a width of πd, where d is the outer diameter of the pipe. These cold-rolled sheets usually have a maximum wall thickness difference of 0.002 inches. Stainless steel welded pipe: Seam pipe is made of precise cold-rolled sheet. ![]() The difference between the appearance and concentricity of the steel pipe Seamless pipe: It uses round steel perforated as the raw material of the tube blank, and is made by the production process of cold rolling, cold drawing or hot extrusion.Ģ. Different welding methods can be divided into straight seam welded pipe and spiral welded pipe. Stainless steel welded pipe: It is welded by steel plate or steel strip after being crimped and formed by the unit and mold. How to choose? The following stainless steel manufacturers will talk about the difference between the two in detail. Many people do not know the difference between them. Stainless steel pipes can be divided into stainless steel welded pipes and stainless steel seamless pipes. ![]()
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