The difference between the straight seam steel pipe and the seamless steel pipe and the quality of the national standard welding seam directly determines the quality of the welded pipe, and is also the biggest difference between the welded pipe and the seamless pipe.
After the high-frequency welding of straight seam welded pipe, the carbon in the straight seam cannot be eliminated. The welding seam and the parent body are only joined together. They are not completely melted and cannot stand the test of time and high pressure. For more information, please refer to the reference.
After the high-frequency welding, the hot tension reducing steel pipe is subjected to 800°C high-temperature integral heating and annealing as a whole, and then undergoes open-change treatment. After this series of processes, the weld joint and the matrix structure have the same properties and are completely melted into one body. It is well done from the seam to the seamless transition.
Straight seam steel pipe and seamless steel pipe sales office Kunlian Steel Tube Factory, hotline:.
Q235 refers to the yield strength of the material, in the past called A3 steel
20# steel refers to a quality carbon structural steel grade with a carbon content of about 0.2%.
The national standard of seamless steel pipe is GB8162, the national standard of straight seam welded steel pipe is GB/T13793
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