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| Effect of coiling temperature on precipitation of second #br# phase in ultralow carbon T3 CA steel |
| SUN Chaofan1,2，FANG Yuan1,2，WANG Yaqing1,2，LIU Wei3，PAN Hongwei1,2 |
(1. Research Institute of Technology， Shougang Group Co.， Ltd.， Beijing 100043， China；
2. Beijing Key Laboratory of Green Recyclable Process for Iron and Steel Production Technology，
Beijing 100043， China；3. The Tinplate Department, Shougang Jingtang United Iron and
Steel Co.， Ltd.， Tangshan 063200， Hebei， China) |
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Abstract In order to study the effect of coiling temperature on the precipitation behavior of the second phase particles in ultralow carbon T-3 CA steel，the precipitation characteristic of the second phase particles in ultralow carbon T-3 CA steel under three typical temperatures 580，630 and 680 ℃ were studied by OM and TEM. The results showed that the higher the coiling temperature，the larger the TiC particles and the sparser distribution of them would be formed during the hotrolling process. The coiling temperature’s influence on the precipitation behavior of the TiC particles was analyzed by the kinetic calculation of TiC precipitation. The calculation showed that with the coiling temperature raise from 580 to 680 ℃，the size of the crystal nucleus of TiC particle would be increased by nearly 1.0 nm，the nucleation rate of the TiC particle would be decreased by almost 1.0 order of magnitude and the incubation time of the TiC particles would be prolonged by nearly 0.8 order of magnitude.
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