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:
Apr. 25, 2023
Filed:
Dec. 20, 2018
Posco, Pohang-si, KR;
Un-Hae Lee, Gwangyang-si, KR;
Tae-Kyo Han, Gwangyang-si, KR;
Sang-Deok Kang, Gwangyang-si, KR;
Sung-Kyu Kim, Gwangyang-si, KR;
Yong-Jin Kim, Gwangyang-si, KR;
POSCO CO., LTD, Pohang-si, KR;
Abstract
A high-strength austenite-based high-manganese steel material and a manufacturing method for the same, the steel material comprising: manganese (Mn): 20 to 23 wt %, carbon (C): 0.3 to 0.5 wt %, silicon (Si): 0.05 to 0.50 wt %, phosphorus (P): 0.03 wt % or less, sulfur (S): 0.005 wt % or less, aluminum (Al): 0.050 wt % or less, chromium (Cr): 2.5 wt % or less, boron (B): 0.0005 to 0.01 wt %, nitrogen (N): 0.03 wt % or less, and a balance of iron (Fe) and other inevitable impurities, wherein stacked defect energy (SFE) represented by the following relationship 1 is 3.05 mJ/mor more, and a microstructure comprises 95 area % or more (including 100 area %) of austenite, and comprises 6 area % or more of strain grain boundaries in an austenite recrystallized grain, is provided.SFE(mJ/m)=−24.2+0.950*Mn+39.0*C−2.53*Si−5.50*Al−0.765*Cr  [Relationship 1]where Mn, C, Cr, Si, and Al denote weight percent of respective components.