US Patent Issued to NIPPON STEEL on Jan. 13 for "Martensitic stainless steel material and method for producing martensitic stainless steel material" (Japanese Inventors)

ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,522,904, issued on Jan. 13, was assigned to NIPPON STEEL Corp. (Tokyo).

"Martensitic stainless steel material and method for producing martensitic stainless steel material" was invented by Yusaku Tomio (Tokyo) and Daisuke Matsuo (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "The martensitic stainless steel material according to the present disclosure consists of C: less than 0.030%, Si: 1.00% or less, Mn: 0.05 to 2.00%, Cr: 11.50 to 14.00%, Ni: 5.00 to 7.50%, Mo: 1.10 to 3.50%, Cu: 0.50 to 3.50%, Co: 0.01 to 0.30%, Al: 0.001 to 0.100%, N: 0.001 to 0.100%, and the balance: Fe and impurities. The microstructure is composed of retained austenite in ...