Korean Journal of Metals and Materials (대한금속재료학회지)

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

A Study on the High Temperature Gas Nitriding Heat Treatment of STS 347 and STS 310S Austenitic Stainless Steel

STS 347 및 STS 310S 오스테나이트계 스테인리스강의 고온 가스질화 열처리 특성 연구

  • Yoo, Dae Kyoung (Steel Making Department, INI Steel Company) ;
  • Kong, Jung Hyun (Department of Materials Science and Engineering, Dong-A University) ;
  • Lee, Hea Joeng (Department of Materials Science and Engineering, Dong-A University) ;
  • Sung, Jang Hyun (Department of Materials Science and Engineering, Dong-A University) ;
  • Lee, Hae Woo (Department of Materials Science and Engineering, Dong-A University)
  • Received : 2008.06.25
  • Published : 2008.11.25
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Abstract

The influence of high temperature gas nitriding (HTGN) in STS347 and STS310S steels was experimentally investigated. The HTGN was carried out at $1,050^{\circ}C{\sim}1,150^{\circ}C$ for 10 hrs in a gaseous atmosphere containing $1kg/mm^2$ of nitrogen. After HTGN, fine precipitates of $Cr_2N$ and NbN appeared in austenite on the surface of STS 347, while nitrogen pearlite, which was layeredof $Cr_2N$ and austenite alternatively, appeared in austenite on the surface of STS 310S. The surface hardness of HTGN-treated, STS 347 and STS 310S specimens was 250~360 Hv and 270~400 Hv, respectively, depending on the temperature of HTGN. The nitrogen content was analyzed 1.4 wt% and 1.6 wt% at the surface layer of STS 347 and STS 310S steels, respectively. In addition, an improvement in the corrosion resistance of HTGN treated specimens was observed.

Keywords

Acknowledgement

Supported by : 산업자원부

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