Crack defect analysis of 40CrMnMo steel drill pipe material
Zhong Bin, Chen Yiqing, Meng Fanlei, Gao Peng, Ai Fangfang, Li Lin, San Hongyu
Heat Treatment of Metals . 2021, (2): 228 -231 .  DOI: 10.13251/j.issn.0254-6051.2021.02.043