In a Mod.9Cr1Mo steel applied widely to boiler components, low hardness problem related with manufacturing and fabrication processes has become a critical issue recently. In this study, hardness, microstructure, tensile and creep rupture tests have been performed using specimens given various thermal cycles to investigate the detailed mechanism causing low hardness values of 150 to 170 Hv and the minimum hardness requirement from a standpoint of the tensile properties and the maximum allowable stresses. Low hardness values were mainly attributed to the formation of ferrite phase on cooling after heating at intercritical temperatures just above the Ac1, about 850°C. Ferrite transformation on cooling after intercritical heating occurred even at a relatively faster cooling rate of 3.5 °C/sec since the nose of ferrite transformation in the continuous cooling transformation (CCT) curve moved to the left due to the very low carbon content in austenite phase formed at intercritical region. Low hardness value of 160’s Hv occurred occasionally in practical applications was observed at a cooling rate of below 0.167 °C/sec after intercritical heating. At least 190 Hv of hardness values or more were needed to satisfy tensile properties and maximum allowable stresses specified in ASME Boiler & Pressure Vessel (B&PV) code.
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ASME 2005 Pressure Vessels and Piping Conference
July 17–21, 2005
Denver, Colorado, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4191-X
PROCEEDINGS PAPER
Thermal Histories Causing Low Hardness and the Minimum Hardness Requirement in a MOD.9Cr1Mo Steel for Boiler
Jeong-Tae Kim,
Jeong-Tae Kim
Doosan Heavy Industries & Construction Company, Ltd., Changwon, Gyeongnam, Korea
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Yeong-Soo Lee,
Yeong-Soo Lee
Doosan Heavy Industries & Construction Company, Ltd., Changwon, Gyeongnam, Korea
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Byeong-Ook Kong,
Byeong-Ook Kong
Doosan Heavy Industries & Construction Company, Ltd., Changwon, Gyeongnam, Korea
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Seog-Hyeon Ryu
Seog-Hyeon Ryu
Doosan Heavy Industries & Construction Company, Ltd., Changwon, Gyeongnam, Korea
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Jeong-Tae Kim
Doosan Heavy Industries & Construction Company, Ltd., Changwon, Gyeongnam, Korea
Yeong-Soo Lee
Doosan Heavy Industries & Construction Company, Ltd., Changwon, Gyeongnam, Korea
Byeong-Ook Kong
Doosan Heavy Industries & Construction Company, Ltd., Changwon, Gyeongnam, Korea
Seog-Hyeon Ryu
Doosan Heavy Industries & Construction Company, Ltd., Changwon, Gyeongnam, Korea
Paper No:
PVP2005-71255, pp. 123-128; 6 pages
Published Online:
July 29, 2008
Citation
Kim, J, Lee, Y, Kong, B, & Ryu, S. "Thermal Histories Causing Low Hardness and the Minimum Hardness Requirement in a MOD.9Cr1Mo Steel for Boiler." Proceedings of the ASME 2005 Pressure Vessels and Piping Conference. Volume 6: Materials and Fabrication. Denver, Colorado, USA. July 17–21, 2005. pp. 123-128. ASME. https://doi.org/10.1115/PVP2005-71255
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