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Vol.46, No.11, 708 ~ 713, 2008
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| Title |
| A Study on the High Temperature Gas Nitriding Heat Treatment of STS 347 and STS 310S Austenitic Stainless Steel |
| 유대경 Dae Kyoung Yoo , 공정현 Jung Hyun Kong , 이해정 Hea Joeng Lee , 성장현 Jang Hyun Sung , 이해우 Hae Woo Lee |
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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℃~1,150℃ for 10 hrs in a gaseous atmosphere containing 1 kg/mm2 of nitrogen. After HTGN, fine precipitates of Cr2N and NbN appeared in austenite on the surface of STS 347, while nitrogen pearlite, which was layeredof Cr2N 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. |
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| Key Words |
| HTGN, High Temperature Gas Nitriding, STS 347, STS310S, Cr2N nitride |
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