Method for improving eddy current flaw detection signal-to-noise ratio of N06600 tube through grain control

• Main Authors: WANG ZHIDONG, LENG XIAOYUE, LYU BIN, WANG JIELI, PU YILONG
• Format: Patent
• Language: Chinese; English
• Published: 29.03.2024
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention provides a method for improving the eddy current flaw detection signal-to-noise ratio of an N06600 pipe through grain control. The method comprises the following steps that S1, an N06600 pipe blank is sequentially subjected to the procedures of hot piercing, acid pickling, intermediate product cold rolling, deoiling, heat treatment, finished product cold rolling and deoiling, and an N06600 nickel-based pipe is obtained; s2, the N06600 nickel base pipe is subjected to solution treatment, and then water spacer bush cooling and straightening are conducted; s3, the N06600 nickel-based tube is subjected to metallographic detection, the number of obtuse angles in crystal grains of the nickel-based tube is controlled to be larger than or equal to 80%, the grain size range is controlled to be smaller than or equal to grade 3, and if the number of obtuse angles in the crystal grains of the N06600 nickel-based tube is detected to be smaller than 80%, and the grain size range is larger than grade 3, the st