Control Center Segregation in Continuously Cast GCr15 Bloom by Optimization of Solidification Structure

2020 ◽  
pp. 205-228
Author(s):  
Hanghang An ◽  
Yanping Bao ◽  
Min Wang ◽  
Quan Yang
Keyword(s):  
Solidification Structure ◽  
Control Center ◽  
Continuously Cast

scholarly journals Refining of the Solidification Structure of Continuously Cast 18%Cr Stainless Steel by Electromagnetic Stirring

1981 ◽  
Vol 67 (8) ◽  
pp. 1354-1362 ◽  
Author(s):  
Morihiro HASEGAWA ◽  
Shigeaki MARUHASHI ◽  
Yutaka MURANAKA ◽  
Fumio HOSHI ◽  
Masayuki KINUGASA
Keyword(s):  
Stainless Steel ◽  
Electromagnetic Stirring ◽  
Solidification Structure ◽  
Continuously Cast

Influence of Casting Speed on Solidification Process and Solidification Structure of Continuously Cast Bloom

2011 ◽  
Vol 402 ◽  
pp. 123-131 ◽  
Author(s):  
Zi Bing Hou ◽  
Guo Guang Cheng
Keyword(s):  
Surface Temperature ◽  
Casting Speed ◽  
Control Method ◽  
Target Surface ◽  
Solidification Process ◽  
Solidification Structure ◽  
Transfer Model ◽  
Proportional Control ◽  
Temperature Method ◽  
Continuously Cast

On the basis of problems about quality of steel products that a certain special steel factory facing, a heat transfer model about continuous casting process was first established, then the influence of casting speed on solidification process and solidification structure of continuously cast bloom was comprehensively studied. It is shown that shell thickness leaving mold, crater length and the value of H(which is chosen as the measurement criterion of the number of the heterogeneous nucleation nucleus) are influenced most with increasing casting speed. Meantime, compared with proportional control method, solidification process of continuously cast bloom is in uniform variation with small fluctuation by target surface temperature method. What’s more, when centre solidification time is considered only, central zone macrosegregation may form more easily at last by proportional control method with increasing casting speed, but it is opposite by target surface temperature method; when the value of G/V1/2 and the value of H are considered only, the ratio of equiaxed grain will increase with increasing casting speed by proportional control method, but it is opposite by target surface temperature method.

scholarly journals The Significance of Central Segregation of Continuously Cast Billet on Banded Microstructure and Mechanical Properties of Section Steel

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 76 ◽  
Author(s):  
Fujian Guo ◽  
Xuelin Wang ◽  
Jingliang Wang ◽  
R. D. K. Misra ◽  
Chengjia Shang
Keyword(s):  
Low Temperature ◽  
Solidification Structure ◽  
Cast Billet ◽  
Equiaxed Crystal ◽  
Secondary Cooling ◽  
Elongation Ratio ◽  
Columnar Crystal ◽  
Central Segregation ◽  
Continuously Cast ◽  
Low Temperature Toughness

The solidification structure and segregation of continuously cast billets produced by different continuous casting processes are investigated to elucidate their effect on segregated bands in hot-rolled section steel. It suggested that segregated spots are mainly observed in the equiaxed crystal zone of a billet. The solidification structure is directly related to superheating and the intensities of secondary cooling. To a certain extent, the ratio of the columnar crystal increases with the increase of superheating and secondary cooling. Moreover, the number of spot segregations decreases with the decrease of the equiaxed crystal ratio. After hot rolling, the segregation spots are deformed to form segregated bands in steels. The severe segregation of Mn in segregated bands corresponds with that in the segregation spots. The elongation ratio and low temperature toughness deteriorate significantly by a high fraction of degenerate pearlite caused by central segregation. With a decrease of central segregation, the total elongation is increased by 10% and the ductile–brittle transition temperature (DBTT) is also reduced from −10 to −40 °C. According to the experimental results, columnar crystal in billets is preferred to effectively reduce the degree of central segregation and further improve low temperature toughness and the elongation ratio.

Influence of Secondary Cooling Mode on Solidification Structure and Macro-segregation Behavior for High-carbon Continuous Casting Bloom

2017 ◽  
Vol 36 (7) ◽  
pp. 741-753 ◽  
Author(s):  
Kun Dou ◽  
Zhenguo Yang ◽  
Qing Liu ◽  
Yunhua Huang ◽  
Hongbiao Dong
Keyword(s):  
Continuous Casting ◽  
Casting Process ◽  
Coupling Model ◽  
Solidification Structure ◽  
Secondary Cooling ◽  
Characteristic Parameters ◽  
High Carbon ◽  
Cooling Mode ◽  
Gcr15 Steel ◽  
Continuously Cast

AbstractA cellular automaton–finite element coupling model for high-carbon continuously cast bloom of GCr15 steel is established to simulate the solidification structure and to investigate the influence of different secondary cooling modes on characteristic parameters such as equiaxed crystal ratio, grain size and secondary dendrite arm spacing, in which the effect of phase transformation and electromagnetic stirring is taken into consideration. On this basis, evolution of carbon macro-segregation for GCr15 steel bloom is researched correspondingly via industrial tests. Based on above analysis, the relationship among secondary cooling modes, characteristic parameters for solidification structure as well as carbon macro-segregation is illustrated to obtain optimum secondary cooling strategy and alleviate carbon macro-segregation degree for GCr15 steel bloom in continuous casting process. The evaluating method for element macro-segregation is applicable in various steel types.

Sign in / Sign up

Export Citation Format

Share Document