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| Effect of billet direct rolling process on difference in microstructure and mechanical properties of rebar |
| LIU Xin1，FENG Guang-hong1，ZHANG Hong-liang1，QI Yuan-hong2 |
（1. Metallurgical Technology Institute， Central Iron and Steel Research Institute， Beijing 100081， China
2. State Key Laboratory of Advanced Steel Processes and Products， Central Iron and Steel Research Institute，Beijing 10081， China） |
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Abstract The billet direct rolling process is the trend of the future development of rod and wire rolling production which refers to a new process in which the high temperature billet is directly fed into the mill for rolling by increasing the casting billet temperature of the caster. The finite element method（FEM） was adopted to simulate the rolling process of billet and to determine the effect of billet direct rolling process on the difference of microstructure and mechanical properties of a HRB400 rebar. The effect of billet direct rolling process on the volume fraction of each phase and grain size distribution of the rebar with a cut-lengths of 9 m was calculated，and the mechanical properties of rebar were predicted with the constitutive equation of mechanical properties. The results showed that the microstructure of rebar produced by billet direct rolling process was mainly composed of ferrite，pearlite and trace bainite，of which the average volume fraction was 61.4%，38.4% and 0.2%，respectively. Compared with the traditional hot rolling process，the billet direct rolling process could increase the volume fraction of pearlite and reduce the ferrite volume fraction. There were some differences in the axial distribution of the grain size of the rebar produced by the billet direct rolling process，the average grain size in the head region，the middle region and the tail region of the rebar were 7.4，7.9 and 8.5 μm，respectively. In addition，the upper limit value of the yield strength of the rebar was 454 MPa，and the lower limit value was 449 MPa，which showed that the yield strength difference between the head region and the tail region of the rebar with a cut-lengths of 9 m produced by direct rolling process was about 5 MPa，and the difference of mechanical properties could not be ignored.
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Received: 09 May 2018
Published: 24 December 2018
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2018, Vol. 53 
