The difference between seamless steel pipe, hot tension reducing steel pipe and straight seam steel pipe


Release time:

2022-09-20

At present, the competition in the seamless steel pipe market is becoming increasingly fierce. Due to the limitation of its production process, the production cost of seamless steel pipe has been on the high side, resulting in a gradual decline in its economic benefits. With the technological progress of China's metallurgical industry, instead of seamless steel pipe-new products also began to emerge, so the new product in the end can achieve the indicators of seamless steel pipe? What is the essential difference between them? The following on the market two kinds of easily confused products, thermal tension reducing diameter steel pipe and straight seam-welded pipe to do a brief description of the difference.

The quality of the weld directly determines the quality of the welded pipe, and it is also the biggest difference between the welded pipe and the seamless pipe. After the straight seam welded pipe is welded at high frequency, the carbon concentration in the straight seam cannot be eliminated. The weld seam and the parent body are only connected together and are not completely melted into one body, which cannot stand the test of time and high pressure. After high-frequency welding, the thermal tension reducing steel pipe has to undergo overall heating and overall annealing at a high temperature of 800 degrees, and then undergo open transformation treatment. After this series of processes, the weld seam and the parent body have the same microstructure and properties and are completely melted into one body, thus completing the transition from seam to seamless.

2. Different processes have caused differences in product quality. After high-frequency welding, the thermal tension reduced diameter steel pipe has also carried out a process that is not carried out by the straight seam welded pipe-online removal of internal and external burrs. The presence of burrs will affect the flow of fluid-in the tube, and the burrs block the normal flow of fluid, thereby generating vortices. According to the principle of fluid mechanics, the local pressure of 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 the thermal tension reduced diameter steel pipe, the risk of burr is fully considered, and the burr is limited to remove, so that the wall thickness is uniform and the appearance is no different from that of the seamless pipe. So from this point of view, the hot tension reduced diameter steel pipe has also completed the transition from seam to seamless.

Of course, the difference between the two is not limited to the above two points, but it is enough to show that there is still a big difference between the straight seam welded pipe and the thermal tension reduced diameter steel pipe. The latter has carried out a series of new technologies such as on-line removal of internal and external burrs, overall heating-and type change on the basis of straight seam welded pipe, thus making it a qualitative leap and can be widely used in medium and high pressure fields, while straight seam welded pipe can only be limited to water gas transportation in low pressure environment. Although some people on the seamless steel pipe, heat-tension reducing steel pipe, straight seam welded pipe only three understanding in a vague state, but I believe that with the passage of time, practice has proved that people will correctly understand the thermal tension reducing steel pipe this unique product, so that it in the seamless steel pipe market more and more-big role, to create greater economic benefits for the society!