High-temperature oxidation and corrosion of the inner wall are among the main factors causing the failure of supercritical power station boiler tubes. To extend the service life of boiler tubes and meet rising steam temperature requirements, current measures include using materials with enhanced corrosion resistance, improving...

Anshan Iron and Steel Seamless Plant has successfully trial-produced seamless oil pipes with enhanced mechanical properties and corrosion resistance by optimizing the design composition, smelting, rolling, and heat treatment processes in compliance with American Petroleum Institute (API) Spec 5CT standards. Inspection...

Abstract: A company's Q245R steel boiler tube experienced a horizontal tube burst  after only 8 months of use. The cause of the boiler tube burst was analyzed using macroscopic observation, chemical composition analysis, hardness testing, metallographic inspection, scanning electron microscopy, X-ray diffraction,...

3.1 High-Frequency Straight Seam Welded Pipe (HFW) The development of high-frequency straight seam welded pipe has evolved from traditional roller forming to row roller forming, and now to the current application of flexible forming (FFX), straight edge forming, and equal rigidity (URD) racks. The forming technology has...

1.1 Development of Long-Distance Natural Gas Pipelines 1.1.1 Development of Long-Distance Natural Gas Pipelines on Land Currently, the steel grade of international natural gas pipelines on land has developed from X70 to X80. Since 2003, three new X80 long-distance natural gas pipelines have been constructed in China...

2.2 Factors causing welded pipe cracking 2.2.1 Influence of impurities inside welded pipes To meet the requirements of the welded pipe flattening experiment, ensure the overall performance of the welded pipe, and prevent cracking or other defects, it is necessary to study the substances in the cross-section layer of the...

Abstract: This article analyzes the factors causing the cracking of welded steel pipes in flattening tests from the aspects of experimental equipment, material quality, and personnel operation. The main reasons for the cracking of welded pipes in flattening tests are identified, and treatment strategies for cracking...

Understanding the influence of normalizing temperature on the microstructure and properties of high-strength bainitic steel pipe is crucial for optimizing its performance in various applications. In this study, a series of heat treatment experiments were conducted to investigate the impact of different normalizing temperatures...

Spiral steel pipes are made from coiled steel strips through cold rolling and forming, and welded using the automatic double-wire double-sided submerged arc welding process. The main production process is as follows: (1) Raw materials, including coiled steel strips, welding wire, and flux, undergo rigorous physical and...

When a defect or anomaly jeopardizes the integrity of a pipeline, it necessitates repairs using techniques that bring the pipeline back to its original design specification. If the repair method fails to restore the pipeline to its original specification, two options are available: either the maximum operating pressure...