| 내진용 고강도 철근의 제조와 기술 개발 동향 |
| 황병철1, 심재혁2, 이명규3, 이준호3, 정준호4, 김보성5, 원성빈6 |
1서울과학기술대학교 신소재공학과
2한국과학기술연구원 고온에너지재료연구센터
3고려대학교 신소재공학부
4현대제철 전기로제품개발1팀
5대한제강 생산관리팀
6동국제강 봉형강연구팀 |
| Technical Developments and Trends of Earthquake Resisting High-Strength Reinforcing Steel Bars |
| Byoungchul Hwang1, Jae-Hyeok Shim2, Myoung-Gyu Lee3, Joonho Lee3, Jun-Ho Jung4, Bo-Sung Kim5, Sung-Bin Won6 |
1Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
2High Temperature Energy Materials Research Center, Korea Institute of Science and Technology, Seoul 02792, Republic of Korea
3Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea
4Hyundai Steel, Incheon 22525, Republic of Korea
5Daehan Steel, Busan 49433, Republic of Korea
6Dongkuk Steel, Gyeongsangbuk-do 37874, Republic of Korea |
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Received: 20 September 2016; Accepted: 26 September 2016. Published online: 5 December 2016. |
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| ABSTRACT |
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Since reconstruction of old town in Korea requires high-rise and seismic design construction, many attentions have been paid to high strength seismic reinforced steel bar. In the present paper, technical developments and trends are summarized for developing next-generation seismic reinforced steel bar of grade 700 MPa. Steelmaking process requires high energy efficiency and refining ability. Effects of alloying elements are explained, and alloy design based on computational thermodynamics is introduced. On the other hand, it is considered that grain size refinement by the controlled rolling and low temperature transformation structures formed by the accelerated cooling are effective to obtain acceptable mechanical properties with high strength. Finite element simulation analysis is also useful to understand plastic deformation by rolling, internal and external heat transfer, and corresponding phase transformation of austenite phase to various low-temperature transformation structures. |
| Keywords:
metals, thermomechanical processing, strength, computer simulation, seismic design |
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