Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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A study on the variation of physical properties of line heated classification DH32 thick plate steel

선상가열한 선급 DH32 후판 강재의 물성 변화에 관한 연구

  • Kim, Jeong-Tae (Department of Daewoo Shipbuilding & Marine Engineering Corporation Ltd.) ;
  • Chung, Han-Shik (Department of Energy and Mechanical Engineering, Institute of Marine Industry, Gyeongsang National University) ;
  • Jeong, Hyo-Min (Department of Energy and Mechanical Engineering, Institute of Marine Industry, Gyeongsang National University) ;
  • Lee, Kwang-Sung (Department of Energy and Mechanical Engineering, Gyeongsang National University)
  • Received : 2016.08.19
  • Accepted : 2016.10.04
  • Published : 2016.11.30
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Abstract

This study was performed to study the possibility of TMCP's application for side shell plating curved structures through mechanical property testing to understand if the rules and regulations of DNV and the quality standard of IACS after line heating for TMCP steel and normalizing DH32 material steel could be satisfied. Experimental results showed that TMCP's strength was measured to YS = 385 MPa, 18% higher than the required 315 MPa and TS = 525 MPa, complying with the required range of between 440 and 570 MPa. The minus 20 degree impact test for the Charpy V-Notch complied with the required standard and in addition the hardness test satisfied the requirement of 'Hv10 = 130 ~ 320' by reaching an average of T : 216 and L : 275 respectively.

본 연구에서는 선박의 곡 외판 구조에 TMCP 강재의 사용 범위 확대 가능성을 연구하고자 노말라이징강 및 TMCP 강 DH32 재질 강재에 선상가열 후 기계적 물성 시험을 실시하여 DNV 선급 및 IACS 규정의 품질 요구 기준에 적합한지 연구하였다. TMCP강재 인장시험에서 요구기준 YS = 315 MPa 대비 385 Mpa로서 약 18% 높게 나타났고, TS = 440 ~ 570 MPa 기준 대비 525 MPa로 요구 기준에 적합하였다. 샤르피 V-노치 $-20^{\circ}C$ 충격시험에서도 요구 기준에 적합하였으며 경도시험에서 평균 T : 216, L : 275로서 규정인 Hv10 = 130 ~320 범위에 만족 하였다.

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