
Photo taken on Jan. 10, 2017 shows ballpoint pen tips made of homemade stainless steel at Taiyuan Iron and Steel (Group), or TISCO, in Taiyuan, north China's Shanxi Province. As a leading stainless steel maker, TISCO boasted research and development of high-tech stainless steel products by large efforts on innovation. So far TISCO possesses over 2,700 authorized patents, including 772 patents for invention. (Xinhua/Cao Yang)