The Difference between Seamless Steel Pipe, Thermal Tension Reduced Steel Pipe, And Straight Seam Steel Pipe

At present, the competition in the seamless steel pipe market is becoming increasingly fierce. Due to the limitations of its production process, the production cost of seamless steel pipes has always been high, resulting in a gradual decline in its economic benefits. With the technological progress of China's metallurgical industry, new products that replace seamless steel pipes have begun to emerge. So can the new products meet the various indicators of seamless steel pipes? What are the essential differences between them? The following is the market Let’s briefly explain the difference between the two easily confused products, thermal tension-reduced steel pipes and straight seam welded pipes.
1. The quality of the weld directly determines the quality of the welded pipe and is also the biggest difference between the welded pipe and the seamless pipe. After high-frequency welding of straight seam welded pipes, the carbon collected in the straight seam cannot be eliminated. The weld seam and the parent body are only connected and are not completely melted into one body. They cannot withstand the test of time and high pressure. After high-frequency welding, the thermal tension reduction steel pipe must undergo overall heating at a high temperature of 800 degrees, overall annealing, and then open transformation treatment. After this series of processes, the weld and the parent structure have the same properties and are completely melted into one. , completes the transition from seamed to seamless.
2. Differences in technology lead to differences in product quality. After high-frequency welding, the thermal tension reduction steel pipe also undergoes a process that is not performed on the straight seam welded pipe - online removal of internal and external burrs. The existence of burrs will affect the flow of fluid in the tube, and the burrs block the normal flow of the fluid, thereby generating vortices. According to the principle of fluid mechanics, the local pressure on the weld seam will inevitably increase, and the uneven force will greatly reduce the insurance coefficient of the welded pipe. In the production process of thermal tension reduction steel pipe, the danger of burrs is fully considered, and the burrs are removed to limit the burrs. The wall thickness is uniform, and the appearance is no different from the seamless pipe. So from this point of view, the thermal tension reduction steel pipe has also completed the transition from seamed to seamless.
Of course, the difference between the two is not limited to the above three points, but it is enough to show that there are still big differences between straight seam welded pipes and thermal tension-reduced steel pipes. Based on straight seam welded pipes, the latter has also carried out a series of new technological processes such as online internal and external burr removal, overall heating, and deformation, which has made it a qualitative leap and can be widely used in medium and high-pressure fields, while straight seam welded pipes can only be limited to water and gas transportation in low-pressure environments. Although some people currently have a vague understanding of seamless steel pipes, heat tension-reducing steel pipes, and straight seam welded pipes, I believe that as time goes by and practice proves, people will correctly understand heat tension-reducing steel pipes. A unique product that will play an increasingly important role in the seamless steel pipe market and create greater economic benefits for society!