Korean Journal of Metals and Materials (대한금속재료학회지)

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

Mechanism Study of Sticking Occurring during Hot Rolling of Ferritic Stainless Steel

페라이트계 스테인리스강의 열간압연 시 발생하는 Sticking 기구 연구

  • Ha, Dae Jin (Center for Advanced Aerospace Materials Pohang University of Science and Technology) ;
  • Sung, Hyo Kyung (Center for Advanced Aerospace Materials Pohang University of Science and Technology) ;
  • Lee, Sunghak (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 (Stainless Steel Research Group Technical Research Lab., POSCO)
  • 하대진 (포항공과대학교 항공재료연구센터) ;
  • 성효경 (포항공과대학교 항공재료연구센터) ;
  • 이성학 (포항공과대학교 항공재료연구센터) ;
  • 이종석 (포스코기술연구소 스테인리스 연구그룹) ;
  • 이용득 (포스코기술연구소 스테인리스 연구그룹)
  • Received : 2008.07.08
  • Published : 2008.11.25
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Abstract

Mechanisms of sticking phenomena occurring during hot rolling of a modified STS 430J1L ferritic stainless steel have been investigated in this study by using a pilot-plant-scale rolling machine. As the rolling pass proceeds, the Fe-Cr oxide layer formed in a reheating furnace is destroyed, and the destroyed oxides penetrate into the rolled steel to form a thin oxide layer on the surface region. The sticking does not occur on the surface region containing oxides, whereas it occurs on the surface region without oxides by the separation of the rolled steel at high temperatures. This indicates that the resistance to sticking increases by the increase in the surface hardness when a considerable amount of oxides are formed on the surface region, and that the sticking can be evaluated by the volume fraction and distribution of oxides formed on the surface region. The lubrication and the increase of the rolling speed and rolling temperature beneficially affect to the resistance to sticking because they accelerate the formation of oxides on the steel surface region. In order to prevent or minimize the sticking, thus, it is suggested to increase the thickness of the oxide layer formed in the reheating furnace and to homogeneously distribute oxides along the surface region by controlling the hot-rolling process.

Keywords

Acknowledgement

Supported by : POSCO, 한국과학재단

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