随着冶金、化工、国防工业的迅速发展,特别是原子能工业的发展,需要大批量的小口径薄壁奥氏体钢管。这类钢管,常用的探伤方法有超声波和涡流。不同的产品,对钢管质量要求差别很大,有的允许纵长不大于40毫米(深度小于5％壁厚)的缺陷存在。有的产品,钢管工作环境恶 With the rapid development of metallurgy, chemical industry and national defense industry, especially the development of atomic energy industry, a large number of small-diameter thin-wall austenitic steel pipes are needed. Such steel pipe, commonly used testing methods ultrasonic and eddy current. Different products, steel quality requirements vary widely, and some allow the length of not more than 40 mm (depth less than 5% wall thickness) defects exist. Some products, steel pipe work environment evil