Seamless steel pipe is one of the important products of OCTG. It is widely used in the manufacture of structural and mechanical parts, such as oil drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding. Compared with other steel pipes, seamless steel pipes have stronger bending and torsion capacity under the same cross-sectional area. It is widely used in the national economy and has the right of "industrial ship". Therefore, the quality requirements of seamless steel pipe are very strict.


The inspection of seamless steel pipe generally includes: inspection of geometry, surface quality, test chemical composition, mechanical properties, technological properties, high and low time of structure; non-destructive testing; some special performance inspection and weighing length measurement. Here, we will introduce nondestructive testing to you.


NDT refers to the use of physical or chemical methods, advanced technology and equipment to test and test the internal and surface structure, properties and state of the sample without damage to the sample. The development of nondestructive testing has gone through three stages: nondestructive testing, nondestructive testing and nondestructive testing.


NDT is an early name, which means detection and detection of defects; NDT is the name of the current stage, which means not only detection of defects, but also detection of other information, such as structure, nature, status; NDE is a stage entering or entering a new stage, which requires not only the development of a new stage. At present, we need to test the structure, performance, status and access rights of test components, more comprehensive, more accurate, more comprehensive information, such as with shape, size, location, direction, inclusions, organizational defects and residual pressure of information. It is necessary to combine imaging technology, automation technology, computer data analysis and processing technology, material mechanics and other knowledge fields to evaluate the quality and performance of test components or products in a comprehensive and accurate manner.