발전기용 오스테나이트계 18Mn-18Cr 고질소강의 제조와 인장강도 예측

황병철; 이태호; Byoungchul Hwang; Tae-Ho Lee

Korean Journal of Materials Research, Vol.23, No.9, 483-488, September, 2013

DOI10.3740/MRSK.2013.23.9.483 Export Citation

발전기용 오스테나이트계 18Mn-18Cr 고질소강의 제조와 인장강도 예측

Prediction of Tensile Strength of High-Nitrogen 18Mn-18Cr Austenitic Steels for Generator Retaining Ring

황병철 ^†, 이태호¹

서울과학기술대학교 신소재공학과
¹한국기계연구원 부설 재료연구소 신금속연구본부

Byoungchul Hwang^†, and Tae-Ho Lee¹

Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 139-743, Korea
¹Advanced Metallic Materials Division, Korea Institute of Materials Science, Changwon 641-831, Korea

E-mail:

Over the past few decades, high-nitrogen austenitic steels have steadily received greater attention since they provide a unique combination of high strength and ductility, good corrosion resistance, and non-magnetic properties. Recently, highnitrogen 18Mn-18Cr austenitic steels with enhanced strength have been developed and widely used for generator retaining rings in order to prevent the copper wiring from being displaced by the centrifugal forces occurring during high-speed rotation. The high-nitrogen austenitic steels for generator retaining ring should be expanded at room temperature and then stress relief annealed at around 400 oC to achieve the required mechanical properties. In this study, four kinds of high-nitrogen 18Mn-18Cr austenitic steels with different nitrogen content were fabricated by using a pressurized vacuum induction melting furnace, and then the effects of nitrogen content, cold working, and stress relieving on tensile properties were investigated. The yield and tensile strengths increased proportionally with increasing nitrogen content and cold working, and they further increased after stress relieving treatment. Based on these results, a semi-empirical equation was proposed to predict the tensile strength of highnitrogen 18Mn-18Cr austenitic steels for generator retaining rings. It will be a useful for the effective fabrication of high-nitrogen 18Mn-18Cr austenitic steels for generator retaining rings with the required tensile properties.

Keywords:high-nitrogen;austenitic steel;tensile strength;retaining ring;generator

[References]

Orita K, Ileda Y, Iwadate T, Ishizaka J, ISIJ Int., 30, 587 (1990)
Material Specification B50A743, General Electric Power Generation Engineering, Schenectady, NY (1981). (1981)
Process Specification P14A-AL-0201, General Electric Power Generation Engineering, Schenectady, NY (1987). (1987)
Speidel MO, Kowanda C, Diener M, HNS 2003 (High Nitrogen Steels), Schaffhausen, Switzerland, Institute of Metallurgy, ETH, Zurich (2003). (2003)
Gavriljuk VG, Berns H, High Nitrogen Steels, Springer Berlin (1999). (1999)
Akdut N, De Cooman BC, Proc. 7th Int. Conf., High Nitrogen Steels, GRIPS media, Ostend, Belgium (2004)
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Balachandran G, Bhatia ML, Ballal NB, ISIJ Int., and P. Krishna RAO, 41, 1018 (2001)
Karjalainen LP, Taulavuori T, Sellman M, Kyrolainen A, Steel Res. Int., 79, 404 (2008)
Norstrom LA, Metal Sci., 11, 208 (1977)
Lee TH, Oh CS, Kim SJ, Scr. Mater., 58, 110 (2008)
Talonen J, Nenonen P, Hanninen H, J. Foct, in Proc. 7th Int. Conf. High Nitrogen Steels (Ostend, Belgium, 2004), eds. N. Akdut, B. C. De Cooman, 113 (2004)

[Referenced By]

[Related Articles]

[1] Orita K, Ileda Y, Iwadate T, Ishizaka J, ISIJ Int., 30, 587 (1990)

[2] Material Specification B50A743, General Electric Power Generation Engineering, Schenectady, NY (1981). (1981)

[3] Process Specification P14A-AL-0201, General Electric Power Generation Engineering, Schenectady, NY (1987). (1987)

[4] Speidel MO, Kowanda C, Diener M, HNS 2003 (High Nitrogen Steels), Schaffhausen, Switzerland, Institute of Metallurgy, ETH, Zurich (2003). (2003)

[5] Gavriljuk VG, Berns H, High Nitrogen Steels, Springer Berlin (1999). (1999)

[6] Akdut N, De Cooman BC, Proc. 7th Int. Conf., High Nitrogen Steels, GRIPS media, Ostend, Belgium (2004)

[7] Uggowitzer PJ, Harzenmoser M, in Proc. Conf. High Nitrogen Steels (Lille, France, 1988), eds. J. Foct, A. Hendry (The Institute of Metals, London, 1989) p. 174., 174 (1989)

[8] Balachandran G, Bhatia ML, Ballal NB, ISIJ Int., and P. Krishna RAO, 41, 1018 (2001)

[9] Karjalainen LP, Taulavuori T, Sellman M, Kyrolainen A, Steel Res. Int., 79, 404 (2008)

[10] Norstrom LA, Metal Sci., 11, 208 (1977)

[11] Lee TH, Oh CS, Kim SJ, Scr. Mater., 58, 110 (2008)

[12] Talonen J, Nenonen P, Hanninen H, J. Foct, in Proc. 7th Int. Conf. High Nitrogen Steels (Ostend, Belgium, 2004), eds. N. Akdut, B. C. De Cooman, 113 (2004)