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...

1. The chemical composition of steel The chemical composition of steel is the most important factor affecting the performance of seamless steel pipes. It is also the main basis for formulating the process parameters of tube rolling and heat treatment of steel tubes. In the seamless steel pipe standard, corresponding requirements...

1.3.2 Influence of opening angle and extrusion force It is very important to ensure that the edges of the stainless steel strip are flat, smooth and have as few burrs as possible for subsequent welding. Zesheng Zhang and others found that whether the burning process of the edge is stable or not during welding...

At present, a lot of research is carried out on the high-frequency welding of stainless steel. Yudong Dong and others studied and analyzed the changes in the microstructure and properties of the welding seam by high-frequency welding of 12%Cr ferritic stainless steel. Zongyue Bi and others studied...

Abstract: To ensure the quality of stainless steel high-frequency welded pipes and realize their quality control, the main factors affecting the process quality of stainless steel high-frequency welding were analyzed, including the physical and chemical properties of stainless steel, welding and forming processes....

Around 1970, China imported some magnetic flux leakage detection devices from developed countries. After that, China gradually began to conduct research on magnetic flux leakage technologies. In 1999, given China's great demand for magnetic flux leakage detection technology for steel pipes,...

In recent years, developed countries have attached great importance to the development of magnetic flux leakage detection technologies. Although the main body in many types of researches is not the seamless steel pipe, it is also crucial to the development of magnetic flux leakage detection technology for seamless...

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...