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Distinguishing method of welded steel pipe and seamless steel pipe
1. Metallographic method The metallographic method is the main method to distinguish welded steel pipes and seamless steel pipes. There is no welding material added to the high-frequency resistance welded steel pipe, so the weld seam in the welded steel pipe is very narrow, an...Read more -
What should be paid attention to when welding galvanized steel pipes
The welding of galvanized steel pipe should pay attention to: 1. Galvanized steel pipes with a pipe diameter greater than 100mm should be connected by flanges or ferrule-type special pipe fittings. 2. For the weld between galvanized steel pipe and flange, to ensure the welding...Read more -
Submerged arc steel pipe high-frequency welding process
Submerged arc steel pipe high-frequency welding process introduction: 1. The control of the weld gap: After rolling by multiple rollers, the strip steel is sent to the welded pipe unit. The strip steel is gradually rolled up to form a circular tube blank with an opening gap. A...Read more -
Technical characteristics of double-sided submerged arc welding spiral steel pipe
1. During the forming process of double-sided submerged arc welding spiral steel pipe, the deformation of the steel plate is uniform, the residual stress is small, and the surface does not produce scratches. Processed steel pipes have greater flexibility in the range of diamet...Read more -
How to prevent decarburization of steel pipes
Once decarburization occurs in the production process of the steel pipe, it will affect the subsequent process, and also reduce the high-quality performance and service life of the steel pipe itself, so manufacturers usually take appropriate measures to avoid or solve this pro...Read more -
What are the standards for the storage of anti-corrosion steel pipes
1. The appearance of the storage and delivery of anti-corrosion steel pipes needs to be checked as follows: ① Check each root to ensure that the surface of the polyethylene layer is flat and smooth, without dark bubbles, pits, wrinkles, and cracks as a whole, and the overall c...Read more -
Forming method and connection type of large-diameter steel pipe
At present, the main production process of large-diameter steel pipes in my country is hot-rolled large-diameter steel pipes and thermally expanded-diameter steel pipes. The largest size of thermally expanded seamless steel pipes is 325 mm-1220 mm and the thickness is 120mm. T...Read more -
How to perform daily maintenance on straight seam steel pipe
Long-distance oil and gas pipelines are an important way of energy security. During the anticorrosion construction process of oil and gas pipelines, the surface treatment of straight seam steel pipes is the key factor determining the service life of pipeline anticorrosion. It ...Read more -
What are the heat treatments of stainless steel welded pipes
During the production process of stainless steel welded pipe, intermediate heat treatment and finished heat treatment can be carried out. Because a bright surface without oxidation can be obtained, the traditional pickling process is canceled. The use of this heat treatment pr...Read more