US Patent Issued to BAOSHAN IRON & STEEL on Sept. 1 for "Nb microalloyed high strength high hole expansion steel and production method therefor" (Chinese Inventor)

ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,723,289, issued on Sept. 1, was assigned to BAOSHAN IRON & STEEL Co. LTD. (Shanghai).

"Nb microalloyed high strength high hole expansion steel and production method therefor" was invented by Jianchun Wu (Shanghai).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are a Nb microalloyed high strength high hole expansion steel comprising in percentages by weight: 0.01-0.05% of C, 0.2-0.6% of Si, 0.8-1.5% of Mn, less than equal to0.02% of P, less than equal to0.005% of S, less than equal to0.008% of N, greater than0.001% of Als, less than equal to0.0050% of Ca, 0.01-0.08% of Nb, and optionally one or both of 0.1-0.6% of Cu and 0.005-0.04% of Sn, where...