Seamless steel pipes have been widely used in the delivery, construction, machinery and other fields, and play a pivotal role in the industry. They are called the vessel of modern industry. The defects of seamless steel pipes are mainly formed by the slow extension of metallurgical defects. In the subsequent...

3. Scanning tests of welding seams (1) Calibration of AUT systems: The adjusted AUT scanning device was plated on the calibration  block to calibrate one by one in accordance with the simulated focus law to ensure that the amplitude of the strip scan signal of each channel was between...

Abstract Automatic Ultrasonic Testing (AUT) has become the preferred testing method for welding seams of carbon steel pipes due to its high efficiency, accuracy and environmental protection. However, AUT is difficult to apply to the inspection of pipelines with a diameter of 114.3 mm (4 inches) and below due...

The development history of the continuous rolling process of the steel pipe The production of seamless steel pipes originated from the cross rolling piercing process of the MF Brothers in Germany. When they straightened round steel bars on a slanted roll straightening machine, they found that the center...

A comprehensive comparative analysis of ductile iron pipes and steel pipes with different materials is carried out in this article, and a preliminary analysis of the actual engineering economic comparison results of generally buried pipelines is provided.   1. Making a comprehensive performance...

The main pipes for buried gas pipelines are cast iron pipes, PE pipes, and steel pipes. The nature of each pipe determines the strength, plasticity and corrosion resistance of the pipeline. Therefore, choose suitable pipes based on research on the use environment and characteristics of...

1.5 Metallographic inspection Cut 3 pieces of metallographic samples along the base material of the leaking pipe, the largest opening and crack tip of the leakage port from the cross section. The etchant is the nitric acid alcohol solution with 4%. The metallographic samples are observed by...

Abstract: The leakage at the four tubes such as the water-cooled wall, superheater tubes, reheater tubes, and economizer tubes in a power station boiler is one of the important factors that cause the unplanned shutdown of the unit. In order to deeply analyze the leakage of the butt welding seam of the reheater...

2. Economic analyses of pipes based on the internal optimized anti-corrosion coating Although epoxy ceramic internal anticorrosion will increase the investment, its roughness is small. The pipe diameter can be appropriately reduced, thereby reducing the unit price of pipeline construction and installation....

Abstract: Steel pipes and ductile iron pipes, as the first choice in the construction industry, have their own advantages and disadvantages. The economy of pipe engineering from the perspective of investment is analyzed, providing economic value reference for the comparison and selection of engineering pipes. For...

Features of high pressure boiler tubes The material of the high-pressure boiler tube will creep because it works under high temperature and high pressure for a long time, resulting in a decline in plasticity and toughness, change of the original structure and corrosion. The steel pipe used for the...

The main influencing factors of corrosion of OCTG pipes PH value: Hydrogen ion is a cathode depolarizer. Generally, the lower the PH value is, the more serious the metal corrosion becomes. When the pH value is greater than 6.6, the corrosion rate begins to decrease.   Cl- or total salinity:...