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Types and causes of quenching cracks in seamless steel pipes
1. Surface defect-induced quenching cracks When a certain unit rolls 26CrMo4s alloy structural pipes, small quenching cracks often appear on the inner wall. Photos of the polished micromorphology show that there are many surface defects such as pits and warping with a depth of no more than 0.2mm ...Read more -
Analysis of process factors affecting high-frequency straight seam welded pipes
The main process parameters of high-frequency straight seam welded pipes include welding heat input, welding pressure, welding speed, opening angle, position and size of the induction coil, position of impedance, etc. These parameters have a great impact on improving the quality, production effic...Read more -
The main reasons and solutions for the matte spots on steel pipes after electroplating
The main reasons for the matte spots on steel pipes after electroplating include: - Unclear degreasing: The oil, dust, and other organic impurities on the surface of the substrate have not been thoroughly cleaned, which directly affects the adhesion and uniformity of the coating, resulting in the...Read more -
Quality problems in the production process of seamless steel pipes – quality defects of tube billets and their prevention
1. Quality defects of tube billets and their prevention. The tube billets used to produce seamless steel pipes can be either continuous casting round tube billets, rolled (forged) round tube billets, centrifugally cast round hollow tube billets, or steel ingots. In the actual production process, ...Read more -
How to prevent corrosion when welding galvanized steel pipes
Anti-corrosion of galvanized steel pipe welding: After surface treatment, hot spray zinc. If galvanizing is not possible on-site, you can follow the on-site anti-corrosion method: brush epoxy zinc-rich primer, epoxy micaceous iron intermediate paint, and polyurethane topcoat. The thickness refers...Read more -
What is the stress state of spiral steel pipe during extrusion
(1) During the extrusion process, the temperature of the inner lining of the spiral steel pipe continues to rise as the extrusion process progresses. At the end of the extrusion, the temperature of the inner wall of the lining near the extrusion die is high, reaching 631°C. The temperature of the...Read more