Test Method of SMLS steel pipe

Generally,seamless steel pipe may have defects are double skin, crack, fold, etc.

When both end of the reserved resection margin is less, due to the functional  reasons of the detection facility, both ends of the head and sometimes the lack of effective testing, the end is most likely have cracks or other defects in the site. End there is a potential crack tendency, the installation of the weld heat affected may also be potential crack propagation. Thus, we should note that the detection of a certain region of the seamless steel pipe, the detection of defective expansion of the pipe ends on time. 

With austenitic seamless steel pipe should be noted that when the insulation is damaged or there may be rain infiltrated the site, penetrant testing, to detect stress, corrosion, cracking or pit problems. 

Magnetic particle testing, penetrant testing can be easily found that the surface crack, fold, double skin, hairline, pinhole surface defects. Ferromagnetic material, should give priority to the use of magnetic particle testing method, because it is easily to be detected; non-ferromagnetic material such as stainless steel seamless pipe penetration assay. 

Magnetic powder or penetration testing only in the steel pipe surface to detect internal and surface defects are powerless. The internal surface detection, especially detection of crack, must be to be detected by ultrasonic testing facility. 

Abstract from Xinyue Steel