Seamless steel pipe is one of the important products of OCTG products. It is widely used in manufacturing structural parts and mechanical parts, such as petroleum drill pipe, automobile transmission shaft, bicycle frame and steel scaffolding. Compared with other steel tubes, seamless steel tubes have stronger bending and torsion capacity under the same cross-sectional area. It is widely used in the national economy and has the right to "industrial vessels". Therefore, the quality requirements of seamless steel tubes are very demanding.
Inspection of seamless steel pipe generally includes: Inspection geometry, surface quality, test chemical composition, mechanical properties, process performance, high and low time of organization; nondestructive testing; some special performance inspection and weighing length measurement. Here we are going to introduce you to nondestructive testing.
In the absence of damage to the specimen, NDT refers to the use of physical or chemical methods, advanced technology and equipment to test and test the internal and surface structures, properties and states of the sample. The development of NDT has gone through three stages: NDT, NDT and NDT.
NDT is the name of the early stage, its meaning is detection and detection of defects; NDT is the name of the current stage, which means not only to detect defects, but also to detect other information, such as structure, nature, state and so on; and nondestructive evaluation (NDE) is one of entering or entering a new stage, which not only requires the development of a new phase. At present, we need to detect the structure, performance, status and access rights of the test parts, more comprehensive, more accurate, comprehensive information, such as the defects related to the shape, size, position, direction, inclusions, organizational defects and residual stress of the 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 the test parts or products in an all-round and accurate way.
