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The manufacturing and development process of seamless stainless steel pipes is to drill holes on Chinese stainless steel billets at a temperature of 2200°f. At high temperatures, the tool steel is softened and is spirally formed in the holes after the design is stamped and drawn. . In this way, the wall thickness of the tube is not uniform and the eccentricity is high. The wall thickness difference of the seamless pipe is greater than the wall thickness difference of the horizontal joint pipe. Since my country's stainless steel slit pipe is made of precision cold-rolled sheet material, the wall thickness tolerance range of the slit pipe is very small, and the wall thickness of the entire calculation circle is very uniform.
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The chemical composition of seamless stainless steel pipes and seamed stainless steel pipes are different. The steel components used to produce seamless pipes only meet the basic requirements of ASTM. The steel used to produce joints contains chemicals suitable for welding. For example, silicon, sulfur, manganese, oxygen and triangular ferrite are mixed in proportion to produce welding flux, which easily transfers heat during the welding process, so that the entire weld is completely fused. This kind of chemical-free steel pipe, such as seamless steel pipe, will produce various unstable elements during the welding process, which will make the welding hard and impermeable. Let me share with you the 9 of seamless stainless steel pipe and seamed stainless steel pipe. Big difference:
During the manufacturing process of stainless steel punching blanks at a temperature of 2200°F, the steel is softened and formed by punching and spiral drawing in the hole cutter. Therefore, the tube wall thickness and eccentricity are not uniform. Therefore, ASTM ensures that the wall thickness of seamless steel pipes is greater than the difference between the gaps in the seam pipe. Grooved tubes are formed by precision cold-rolled thin plates (4-5 feet in width per roll). Such cold rolled sheets generally have a maximum thickness difference of 0.002. The sheet is cut into width πD, where d is the outer diameter of the tube. The thickness tolerance of the slit tube is small, and the wall thickness is very uniform on the entire circumference.
2. Welding performance
Generally, the chemical composition of sewn pipes and seamless pipes have different understandings. The steel composition used in the production of seamless pipes only meets the basic development requirements of ASTM. The steel used for production joints contains a chemically reactive substance suitable for welding. For example, silicon, sulfur, manganese, oxygen and triangular ferrite are mixed in proportion to produce a weld flux that can easily transmit heat during welding work, so that our entire weld is completely penetrated. Such chemical-free steel pipes, such as seamless pipes, will produce various socially unstable elements in the welding process management, which makes the welding hard and unable to penetrate.
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