최형섭 최주 2024-01-12T10:35:51Z 2024-01-12T10:35:51Z 1974-09-25 https://pubs.kist.re.kr/handle/201004/84701 고Mn내열합금강 Patent 1974-09-25 1973-11-27 4281 73-1997 KO 특허 한국과학기술연구원