US Patent Issued to POSCO on June 16 for "Ultrahigh strength cold-rolled steel sheet and manufacturing method thereof" (South Korean Inventors)

ALEXANDRIA, Va., June 16 -- United States Patent no. 12,655,492, issued on June 16, was assigned to POSCO Co. LTD (Gyeongsangbuk-Do, South Korea).

"Ultrahigh strength cold-rolled steel sheet and manufacturing method thereof" was invented by Min-Seo Koo (Gwangyang-si, South Korea) and In-Shik Suh (Pohang-si, South Korea).

According to the abstract* released by the U.S. Patent & Trademark Office: "An ultrahigh strength cold-rolled steel sheet and a manufacturing method thereof are provided. An ultrahigh strength cold-rolled steel sheet, according to a preferred aspect of the present invention, comprises, in percentage by weight: C: 0.25 to 0.4%; Si: 0.5% or less (excluding 0); Mn: 3.0 to 4.0%; P: 0.03% or less (excluding 0); S: 0.015% or le...