1945.08

1. 상공부 직할 한일 광업사, 개발착수
   Hanil Mining Company, under direct supervision of the Commerce-Industry Ministry, started development.

1956.04

1. 성하상사 주식회사 설립 (1956. 4. 27) 흑연, 무연탄 무역
   Seongha Trading Company was established (April 27,1956) for import and export of graphite and anthracite.

1962.10

1. 한일흑연 주식회사 → 성하상사 주식회사로 광업권 이전등록
   Mining rights transferred from Hanil Graphite Company to Seongha Trading Company.

1995.12

1. 상호변경 (성하상사 주식회사 → 주식회사 성하)
   Change of company name from Seongha Trading Company to Seongha Corporation.

2010.07

1. 석탄산업합리화 조치로 광업 사업 종료 - 성하 '마로광업소' 폐광
   Under rationalization of coal industry, mine agreed upon to close.

2011.03

1. 석탄, 흑연, 코크스, 탄소소재, 내화소재 등 수출입. 내수판매
   Resumed businesses in specializing import/export of carbon and related materials.

2017.11

1. 카본소재 분체설비 완공
   Carbon Powder Facility completed.