公开(公告)号：US12098450B2

公开(公告)日：2024-09-24

申请号：US17271024

申请日：2019-08-22

申请人： KOMATSU LTD. ,  NIPPON STEEL CORPORATION

发明人： Eiji Amada ,  Kazuo Maeda ,  Naomi Kobayashi ,  Takashi Noda ,  Mamoru Hatano ,  Takafumi Amata ,  Yutaka Neishi ,  Kei Miyanishi ,  Ryoji Nishijima

IPC分类号： C22C38/04 ,  C21D7/13 ,  C21D9/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

CPC分类号： C22C38/04 ,  C21D7/13 ,  C21D9/0087 ,  C22C38/002 ,  C22C38/02 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C21D2211/008

摘要： A track link which is a tracked undercarriage component is made of a steel having a specific component composition, and includes a high hardness portion having a hardness of HRC 57 or more and HRC 60 or less, and a low hardness portion. The high hardness portion includes a first matrix including a martensite phase and a residual austenite phase, and first nonmetallic particles dispersed in the first matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a M23C6 carbide. The low hardness portion includes a second matrix including a martensite phase, and second nonmetallic particles dispersed in the second matrix and including at least one species selected from the group consisting of MnS, TiCN, and NbCN, and it does not include a M23C6 carbide.