3. Measures for cracking of welded pipes based on flattening tests 3.1 Improving the welding level Since the level of the welding process will have a direct impact on the flattening test results, which is one of the main reasons for the cracking of the welded pipe, it is necessary to pay attention to the welding process...

The analysis and conclusion of inspection of flattening tests of welded steel pipes 2. Analysis and discussion The material and mechanical properties of the samples meet the requirements of the standard. The fracture of the sample is a wood-grain layered fracture, and there are many longitudinally arranged cracks on the...

Abstract: When the flattening of welded steel pipes was tested, cracking happened. Different tests were carried out to find out the reasons.   Welded steel pipes for low-pressure fluid transportation are used for transporting general low-pressure fluids such as water, gas, oil and heating steam. The steel pipes must...

Intensification can aggregate advantageous for the market, thereby improving operational efficiency. For standardized welded pipe products such as water and gas pipes and pipes for general building structures that are in high demand in the market, the technical requirements are relatively single, the specifications are...

The Central Economic Working Conference in December 2020 pointed out that China's carbon dioxide emissions will strive to peak before 2030, and achieve carbon neutrality before 2060. In the future, carbon peaking and carbon neutrality will be an important issue in the development of China's steel industry. As a...

Large scale and specialization Since the reform and opening up, especially in the past ten years, the production scale of welded pipes in China has continued to increase, and the production capacity has far met the quantitative needs of domestic economic growth. After the adjustment in 2018, the output of welded pipes...

The defects of OCTG mainly come from three aspects: defects of the OCTG itself, defects of the OCTG generated in the manufacturing and the use performance of the OCTG. Defects of the OCTG itself such as the mechanical properties and weighing of the OCTG not meeting the requirements. Defects generated in the manufacturing...

The performance of OCTG pipes includes anti-collapse, anti-corrosion and perforation performance. (1) Anti-collapse performance With the increase of drilling depth, the pressure of oil pipes and casings in oil and gas wells increases, especially in deep wells, ultra-deep wells and plasticity running ground such as rock...

The tube's rolling process is the main process to determine the wall thickness of the seamless steel tube, and its function is to reduce the wall of the perforated billet. The main defects are uneven wall thickness of pierced billets, cracks on surfaces, pits, scratches, puncturing and so on.   1. Defects of automatic...

  Perforation is the first process and one of the most important deformation processes of hot rolled seamless steel pipes. Its function is to pierce the solid tube blank and a hollow tube is formed. According to the deformation characteristics of the tube blank's piercing process, it is divided into the longitudinal...