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| Discussion about the microstructure transformation of 25MnSiVN high strength reinforcement anti-seismic bars |
| LIU Jin-yuan1��QIU Wei-ming2��LI Xiang-long1��ZHONG Shou-jun1 |
��1.Technology Center�� Shaoguan Iron and Steel Group Co.�� Ltd.�� Shaoguan 512123�� China
2. Guangdong Shaoguan Quality Metrology Supervision and Inspection Institute�� Shaoguan 512120�� China�� |
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Abstract To design a reasonable rolling process�� using a thermal simulated phase change expansion method�� which was combined with the microstructure analysis and hardness test method�� the microstructures of 25MnSiVN��600MPa�� high strength anti-seismic steel bars produced by vanadium nitrogen microalloying were studied. The 25MnSiVN dynamic continuous transition CCT curve was measured�� at the same time�� the critical phase transition temperatures of[Ac1��] [Ac3��][Ar1]and[Ar3]of 25MnSiVN were measured. The results showed that when the cooling rate was lower than 3 ��/s�� only the ferrite and pearlite microstructures phase change occurred. When the cooling rate was greater than 3 ��/s�� the bainite transformation occurred. When the cooling rate was greater than 15 ��/s�� the martensitic transformation occurred. To ensure that HRB600E steel to get the uniform fine ferrite��pearlite structure�� and avoid the production of bainite or even martensite�� the cooling rate after the steel rolling should be controlled lower than 3 ��/s in the large production. The results were applied in the design of a reasonable rolling process�� so a qualified 600 MPa grade high strength anti-seismic steel was produced.
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Received: 31 May 2017
Published: 27 February 2018
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| [1] |
���ž�.��ǿ�ֽ���о���ʹ����״.���Ĵ���������2009.06, ��29��3�ڣ�213-220.
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| [2] |
��������.GB1499.2-2013���ֽ���������������߸ֽ���ұ�������˵��������壩.2012.04.28
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2018, Vol. 36 
