Defect inspection of seamless steel pipe
Defect inspection of seamless steel pipe
Visual inspection is generally used. The surface quality requirements are relatively high, and the thickness of the oxide scale is relatively thick. Before the inspection, pickling or shot blasting can be used to remove the oxide scale on the surface of the tube. The surface defects are exposed for easy visual inspection.
The visual inspection room is most commonly used, but its reliability is checked. Magnetic induction flaw detection can also be used to check the surface and surface defects of the tube blank. There are many electromagnetic induction flaw detection methods, such as: dry fluorescent magnetic particle flaw detection method, eddy current flaw detection method, electromagnetic flaw detection method.
The macrostructure inspection of the tube blank generally adopts the sulfur printing method and the acid leaching method. Sulfur print inspection is to use photographic paper to show the sulfur segregation on the sample. It can show the distribution of cracks, segregation, macrostructure and inclusions in the tube blank. The acid leaching method uses different corrosive agents and agents to etch the defects of the tube blank and the steel substrate. Because the defects of the tube blank and the steel substrate have different erosion levels, the defects of the small size tube blank that are difficult to identify can be displayed. .
Defect cleaning of seamless steel pipe
Flame cleaning, wind shovel cleaning, manual wheel cleaning and automatic wheel cleaning, turning and belt cleaning.
