Seamless steel tube magnetic particle inspection or penetrant inspection

Magnetic particle inspection or penetration testing can effectively detect surface cracks, folds, serious leather surface defects, hair lines, pinholes. For ferromagnetic materials, magnetic particle inspection method with high sensitivity, priority should be given to magnetic particle inspection; for non-ferromagnetic materials, such as stainless steel seamless pipe, penetrant flaw detection method.


When fewer cutting edges are reserved at both ends, the ends of the heads sometimes lack effective detection due to the configuration of the Kay Casino test device, but are most likely to end the scene of cracks or other defects. If the tip of the crack has potential, the weld heat may also create potential cracks during installation. Therefore, it should be noted that, after the detection of a seamless steel pipe welding area, to find defects extension of the pipe end.


In-line austenitic seamless steel pipe, insulation damage or rain may penetrate the scene should pay attention to through the penetration test to identify stress corrosion cracking or pitting and other defects.


However, magnetic particle inspection or penetration testing can only detect the outer surface of steel pipe, the inner surface defects are powerless. The inner surface of the test, especially for the detection of crack defects, ultrasonic testing must be carried out.