Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
권호 표지

Effects of Alloying Elements on Sticking Occurring During Hot Rolling of Ferritic Stainless Steels

페라이트계 스테인리스강의 열간압연 시 발생하는 Sticking에 미치는 합금원소의 효과

  • Ha, Dae Jin (Center for Advanced Aerospace Materials Pohang University of Science and Technology) ;
  • Kim, Yong Jin (Center for Advanced Aerospace Materials Pohang University of Science and Technology) ;
  • Lee, Jong Seog (Stainless Steel Research Group Technical Research Lab., POSCO) ;
  • Lee, Yong Deuk (Center for Advanced Aerospace Materials Pohang University of Science and Technology) ;
  • Lee, Sunghak (Center for Advanced Aerospace Materials Pohang University of Science and Technology)
  • 하대진 (포항공과대학교 항공재료연구센터) ;
  • 김용진 (포항공과대학교 항공재료연구센터) ;
  • 이종석 (포스코기술연구소 스테인리스 연구그룹) ;
  • 이용득 (포항공과대학교 항공재료연구센터) ;
  • 이성학 (포항공과대학교 항공재료연구센터)
  • Received : 2008.03.31
  • Published : 2008.09.25
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Abstract

In this study, effects of alloying elements on the sticking occurring during hot rolling of five kinds of ferritic STS430J1L stainless steels were investigated by analyzing high-temperature hardness and oxidation behavior of the rolled steels. Hot-rolling simulation tests were conducted by a high-temperature wear tester which could simulate actual hot rolling. The simulation test results revealed that the sticking process proceeded with three stages, i.e., nucleation, growth, and saturation. Since the hardness continuously decreased as the test temperature increased, whereas the formation of Fe-Cr oxides in the rolled steel surface region increased, the sticking of five stainless steels was evaluated by considering both the high-temperature hardness and oxidation effects. The addition of Zr, Cu, or Si had a beneficial effect on the sticking resistance, while the Ni addition did not show any difference in the sticking. Particularly in the case of the Si addition, Si oxides formed first in the initial stage of high-temperature oxidation, worked as initiation sites for Fe-Cr oxides, accelerated the formation of Fe-Cr oxides, and thus raised the sticking resistance by about 10 times in comparison with the steel without Si content.

Keywords

Acknowledgement

Supported by : POSCO, 한국과학재단

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