The effects of lance height and bottom blown flowrate on the mixed time, the splashing amount, the penetrating depth, and the level fluctuation of an 85 t combined blown converter have been studied using a water model...The effects of lance height and bottom blown flowrate on the mixed time, the splashing amount, the penetrating depth, and the level fluctuation of an 85 t combined blown converter have been studied using a water model. The results show that the maximal stirring energy is provided to the bath at the top lance height of about 50-100 mm. When the top lance height is in the range ofg0- 110 mm, the splashing amount caused by the top jet can reach the maximal value. The appropriate operational parameters of Chongqing Iron and Steel Company （CISC） converter have been established that the top lance height is 1600-1760 mm and the bottom blowing flowrate is 240-480 Nm^3/h in the primary phase of a heat, 1100-1300 mm and 160-200 Nm^3/h in the second phase, and 1040-1120 mm and 200-350 Nm^3/h in the end phase. Also, the trial shows that the metallurgical result of the studied blow pattern is better than that of the former pattern. At the starting 3-4 min of a heat, the strong splashing is eliminated. 2008 University of Science and Technology Beijing. All rights reserved.展开更多
The application for FC-Mold(Flow Control Mold)technology is researched in Ansteel slab caster,and the fluctuations of liquid steel in different parameters are emphasis researched.The results show that the fluctuation ...The application for FC-Mold(Flow Control Mold)technology is researched in Ansteel slab caster,and the fluctuations of liquid steel in different parameters are emphasis researched.The results show that the fluctuation of liquid steel can be decreased 50%by using FC-Mold,and the value is decreased from±5mm to±2mm.The casting velocity can be increased 0.5m/min by using FC-Mold.The effect of FC-Mold is increased with increasing of current.And FC-Mold can restrain the unstable liquid steel from velocity changing.The statistic application results for 610 strands show that the degraded ratio for automobile steel is decreased 6%.展开更多
Theory of thermal fluctuations in two-band superconductors under an essentially homogeneous magnetic field is developed within the framework of the two-band Ginzburg-Landau theory. The fluctuating specific heat is cal...Theory of thermal fluctuations in two-band superconductors under an essentially homogeneous magnetic field is developed within the framework of the two-band Ginzburg-Landau theory. The fluctuating specific heat is calculated by using the optimized self-consistent perturbation approach and the results are applied to analyze the thermodynamic data of the iron-based superconductors Ba（1-x）KxFe2As2 with x -0.4, which have been suggested to have a two-band structure by recent experiments. We estimate the fluctuation strength in this material and find that the specific heat is described well with the Ginzburg number Gi = 4 · 10^-4. The influence of interband coupling strength is investigated and the result of the two-band Gaussian approximation approach is compared.展开更多
文摘The effects of lance height and bottom blown flowrate on the mixed time, the splashing amount, the penetrating depth, and the level fluctuation of an 85 t combined blown converter have been studied using a water model. The results show that the maximal stirring energy is provided to the bath at the top lance height of about 50-100 mm. When the top lance height is in the range ofg0- 110 mm, the splashing amount caused by the top jet can reach the maximal value. The appropriate operational parameters of Chongqing Iron and Steel Company （CISC） converter have been established that the top lance height is 1600-1760 mm and the bottom blowing flowrate is 240-480 Nm^3/h in the primary phase of a heat, 1100-1300 mm and 160-200 Nm^3/h in the second phase, and 1040-1120 mm and 200-350 Nm^3/h in the end phase. Also, the trial shows that the metallurgical result of the studied blow pattern is better than that of the former pattern. At the starting 3-4 min of a heat, the strong splashing is eliminated. 2008 University of Science and Technology Beijing. All rights reserved.
基金Item Sponsored by the Postdoctoral Gathering Project in Liaoning Province[No.2011921003]
文摘The application for FC-Mold(Flow Control Mold)technology is researched in Ansteel slab caster,and the fluctuations of liquid steel in different parameters are emphasis researched.The results show that the fluctuation of liquid steel can be decreased 50%by using FC-Mold,and the value is decreased from±5mm to±2mm.The casting velocity can be increased 0.5m/min by using FC-Mold.The effect of FC-Mold is increased with increasing of current.And FC-Mold can restrain the unstable liquid steel from velocity changing.The statistic application results for 610 strands show that the degraded ratio for automobile steel is decreased 6%.
基金Project supported by the National Natural Science Foundation of China(Grant No.11674007)
文摘Theory of thermal fluctuations in two-band superconductors under an essentially homogeneous magnetic field is developed within the framework of the two-band Ginzburg-Landau theory. The fluctuating specific heat is calculated by using the optimized self-consistent perturbation approach and the results are applied to analyze the thermodynamic data of the iron-based superconductors Ba（1-x）KxFe2As2 with x -0.4, which have been suggested to have a two-band structure by recent experiments. We estimate the fluctuation strength in this material and find that the specific heat is described well with the Ginzburg number Gi = 4 · 10^-4. The influence of interband coupling strength is investigated and the result of the two-band Gaussian approximation approach is compared.
