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How does qualified steel pipe behave in terms of straightness, roundness, and welding
1. Straightness: The docking of the straight pipe section of the coiled pipe is a very important part, which requires the accuracy of the coiled pipe cutting, the consistency of the diameter, and the automatic horizontal adjustment of the roller by tools. This can be a good way to find a balance ...Read more -
How to judge the quality of spiral steel pipe
1. From the surface of the spiral steel pipe, you can see whether the production process of the spiral steel pipe is exquisite. Generally, it is necessary to research and analyze spiral steel. The cross-section of fake and inferior spiral steel pipes is oval. The reason is that the manufacturer s...Read more -
Preliminary treatment and use of straight seam steel pipes
Preliminary treatment of straight seam steel pipes: non-destructive testing inside the weld. Since this pipe is an extra-large steel pipe in the water supply project, especially the steel pipe with a thickness of t=30mm is used as a pipe bridge, it must withstand both the internal water pressure ...Read more -
Defects of anti-corrosion of steel pipes coated with epoxy coal pitch paint
1) During on-site construction, the curing of epoxy resin is affected by temperature, the curing is slow, and the construction period is long. 2) Since a large amount of solvent is added during construction, it is easy for some construction units to have the opportunity to cut corners (add more s...Read more -
Advantages of plastic-coated steel pipe as cable protection pipe
Plastic-coated pipes are coated pipes that not only have good corrosion resistance but also have good electrical insulation and low water absorption, extending the service life of the pipes and achieving long-term use. Advantages of plastic-coated steel pipes as cable protection pipes: 1. Suitabl...Read more -
What are the acceptance criteria for steel pipes
① Steel pipe wall thickness inspection: micrometer, ultrasonic thickness gauge, no less than 8 points at both ends and recorded. ② Steel pipe outer diameter and ovality inspection: snap gauge, vernier caliper, ring gauge, measuring point, minimum point. ③Steel pipe length inspection: steel tape m...Read more -
Submerged arc steel pipe forming method
Submerged arc steel pipe forming methods include continuous twist forming (HME), roll forming method (CFE), Uing Oing Expanding forming method (UOE), roll bending forming method (RBE), Jing Cing Oing Expanding forming method (JCOE), etc. However, three forming methods, UOE, RBE, and JCOE, are wid...Read more -
How to treat the surface of high frequency welded steel pipe
1.Cleaning. Solvents and emulsions are used to clean the surface of the steel to remove oil, grease, dust, lubricants, and similar organic matter, but it cannot remove rust, oxide scale, solder, etc. on the surface of the steel, so it is only used as an auxiliary means in anti-corrosion productio...Read more -
Production process of large-diameter straight seam steel pipe
A large-diameter longitudinally welded pipe is a general term. It is produced by a steel strip. The pipes that are welded by high-frequency welding equipment are called longitudinally welded pipes. (The name is given because the welds of the steel pipe are in a straight line). Among them, accordi...Read more -
Seamless steel pipe quality inspection
1. Chemical composition analysis Both instrumental analyses and chemical analyses can be used. The samples used for chemical analysis are smelt samples, ingot drill chips samples, and pipe samples. The smelt sample generally adopts the instrumental analysis method, and the finished pipe sample ad...Read more -
There is no hidden danger in the mixed-use of galvanized pipe and galvanized seamless steel pipe
Galvanized pipe, also known as galvanized steel pipe, has the advantages of thick hot-dip galvanized layer, uniform coating, strong adhesion, and long service life. The hot-dip galvanized seamless steel pipe has a hollow section and is used as a pipeline for transporting fluids, such as pipelines...Read more -
Common defects in the welding area of spiral steel pipe
1. Bubbles Bubbles mostly occur to the center of the weld bead. Hydrogen is still hidden in the weld metal in the form of bubbles. The main reason is that the welding wire and flux have moisture on the surface. They are used directly without drying, and the current is relatively high during the w...Read more
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