Acid leaching tower shape analysis: the ND steel pipe with point deviation defect was forged into 210 mm, and the sample blank of 210 mm * 200 mm was turned into four equal-length steps (first 150 mm, second 130mm, third 110 mm, fourth 90 mm). The acid leaching tower shape detection was carried out. The vertical dark stripes similar to gaskets were found on the forged steel 110 mm and 90 mm steps, while the vertical dark stripes on the two steps of 150 mm and 90 mm were found. It is not obvious.
Gas Detection: According to the collected data of gas related to 5 stoves of steel, it is found that the occurrence and grade of point deviation is not directly related to the gas content in ND steel pipe.