Tools and Machinery
| Thu 19 Mar 2026
Beijing, March 19 -- Hunan Valin Xiangtan Iron & Steel has submitted a patent application for Steel for Hollow Drilling Tool and Production Method Thereof. This invention was developed by Yuan Lin, Luo Xiao, Luo Jingxian, Pan Xiquan, Wang Jun, Gao Qing, Xu Ruijun, Yang Gengchao, Liu Jian, Wang Xuji and Huang Zhenhua.
The patent..