Steel billets are inspected for surface cleanliness through a series of visual and nondestructive testing methods. One of the commonly used techniques is visual inspection, where trained inspectors visually examine the surface of the billets for any visible impurities, such as scale, rust, dirt, or any other contaminants. This method helps identify any surface irregularities that may affect the quality of the billets.
Additionally, nondestructive testing methods like magnetic particle inspection (MPI) and ultrasonic testing (UT) are employed to further evaluate the surface cleanliness of steel billets. Magnetic particle inspection involves applying a magnetic field to the billet's surface and then applying iron particles to it. If any surface cracks or defects are present, the iron particles will be attracted to these areas, making them visible to the inspector.
Ultrasonic testing, on the other hand, uses high-frequency sound waves to detect any internal or surface defects. A probe is placed on the billet's surface, and sound waves are transmitted into the material. These waves are then reflected back to the probe and analyzed to identify any defects, such as inclusions or voids, which may affect the surface cleanliness.
Overall, a combination of visual inspection, magnetic particle inspection, and ultrasonic testing is used to ensure that steel billets meet the required surface cleanliness standards. These inspection methods help identify any impurities or defects that could potentially compromise the quality and performance of the final steel product.
Steel billets are inspected for surface cleanliness through visual inspection, where trained inspectors carefully examine the billets for any visible dirt, oxide scale, or other contaminants. Additionally, surface cleanliness can also be tested using methods like magnetic particle testing or ultrasonic testing to detect any hidden defects or impurities.
