US Patent Issued to POSCo. on May 26 for "Tempered martensitic steel having low yield ratio and excellent uniform elongation, and manufacturing method therefor" (South Korean Inventors)

ALEXANDRIA, Va., May 26 -- United States Patent no. 12,637,728, issued on May 26, was assigned to POSCo. LTD (Pohang-si, South Korea).

"Tempered martensitic steel having low yield ratio and excellent uniform elongation, and manufacturing method therefor" was invented by Yeol-Rae Cho (Gwangyang-si, South Korea), Hwan-Goo Seong (Gwangyang-si, South Korea) and Seong-Beom Bae (Gwangyang-si, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a tempered martensitic steel having a low yield ratio and an excellent uniform elongation, the tempered martensitic steel: comprising, by wt %, 0.2-0.6% of C, 0.01-2.2% of Si, 0.5-3.0% of Mn, 0.015% or less of P, 0.005% or less of S, 0.01-0.1% of Al, 0.01-...