ALEXANDRIA, Va., Nov. 25 -- United States Patent no. 12,480,190, issued on Nov. 25, was assigned to NIPPON STEEL Corp. (Tokyo) and JTEKT Corp. (Aichi, Japan).
"Steel" was invented by Yutaka Neishi (Tokyo), Keisuke Chiba (Tokyo), Kohei Kanetani (Kashiba, Japan) and Takashi Sada (Kashiwara, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A steel consists of, in mass %, C: 0.25 to 0.45%, Si: 0.10 to 0.50%, Mn: 0.40 to 0.70%, P: 0.015% or less, S: 0.005% or less, Cr: 0.80 to 1.50%, Mo: 0.17 to 0.30%, V: 0.24 to 0.40%, Al: 0.005 to 0.100%, N: 0.0300% or less, O: 0.0015% or less, and the balance being Fe and impurities, and satisfies Formula (1) to Formula (4) described in the present specification, wherein: ...