Seamless steel tube magnetic particle testing or penetration testing can effectively detect surface defects such as surface cracks, folding, heavy skin, hairline and pinholes. For ferromagnetic materials, the magnetic particle detection method should be preferred because of its high detection sensitivity; for non-ferromagnetic materials, such as stainless steel seamless steel tubes, the penetration test method is used.

When the seamless steel pipe has a small amount of reserving allowance at both ends, due to the structure of the detecting device, the ends of the two ends are sometimes not effectively detected, and the end is the portion most likely to have cracks or other defects. If there is a potential for cracking in the tip, the thermal effects of soldering during installation may also cause potential crack propagation. Therefore, attention should also be paid to the detection of certain areas of seamless steel pipe after welding, and the extension of the end defects of steel pipes should be discovered in time.