2023.12
- Donghae Mayor's Commendation Award (No. 713)

2023.11
- Certification of promising small and medium-sized enterprises in Donghae City (No. 2023-01)

2023.05
- Environmental Management System Certification (023-80603-E)
- Quality Management System Certification (023-80603-Q)
- Certification of Safety and Health Management System (023-80603-O)

2022.12
- Registration of DB Metal Donghae Plant Resident Partner
- Award of Commendation to Members of the National Assembly (No. 2022-Dong-105)

2022.11
- Registration of venture companies (innovative growth types)
- Ssangyong C&E's Donghae plant resident partner registration

2022.10
- Registration of R&D department

2021.12
- Patent application for belt conveyor meandering prevention mechanism

2021.11
- Business site relocation and factory registration (Donghae Industrial Complex 8-ro 8)

2021.10
- Patent Application for Belt Conveyor

2020.09
- Registration of Metal/Changho Construction Business (Donghae 2020-07-20)

2019.12
- Establishment of Taechang Machinery Co., Ltd

1991.03
- Establishment of parent company Taechang E&C