The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 12, 2024
Filed:
Nov. 22, 2022
Posco Co., Ltd, Pohang-si, KR;
Sang-Ho Han, Gwangyang-si, KR;
Je-Woong Lee, Gwangyang-si, KR;
POSCO CO., LTD, Pohang-si, KR;
Abstract
Provided is a steel sheet by weight percentage (wt %), carbon (C): 0.005 to 0.08%, manganese (Mn): 1.25% or less (excluding 0%), phosphorus (P): 0.03% or less (excluding 0%), sulfur (S): 0.01% or less (excluding 0%), nitrogen (N): 0.01% or less (excluding 0%), soluble aluminum (sol.Al): 0.01 to 0.06%, chromium (Cr): 1.15 to 2.5%, antimony (Sb): 0.1% or less (excluding 0%), at least one selected from the group consisting of nickel (Ni): 0.3% or less (excluding 0%), silicon (Si): 0.3% or less (excluding 0%), molybdenum (Mo): 0.2% or less (excluding 0%), and boron (B): 0.003% or less (excluding 0%), and a remainder of iron (Fe) and other unavoidable impurities, satisfying Expression 1: 1.3≤Mn(wt %)+Cr(wt %)/1.5+Sb(wt %)≤2.7, where Mn, Cr, and Sb refer to contents (wt %) of corresponding elements, respectively; and 1 to 5% of martensite and a remainder of ferrite by an area percentage (area %).