(1. Dalian Special Steel Co., Ltd., Dongbei Special Steel Group, Dalian 116100, Liaoning, China 2. Metallurgical Technology Institute, Central Iron and Steel Research Institute, Beijing 100081,China 3. China Iron and Steel Research Institute, Beijing 100081, China)
Abstract:A two-dimensional non-steady-state heat transfer model was established for the working conditions of bloom GCr15 with the section size of 380 mm×490 mm, and the verification was made on the basis of the pin penetration tests. The calculation results have shown that the solidification end significantly influenced by casting speed, while the effects of superheat and specific water are much lower than casting speed. The solidification end will fluctuate about 0.5 m if casting speed varies 0.01 m/min. However, the distance of solidification endpoint from meniscus will increase 0.3 m if superheat increases 10 ℃. By comparison, the distance increases only 0.15 m if specific water decreases 0.02 L/kg. The internal quality of bloom was not improved when heavy reduction was applied at lower solid fraction, and resulting serious internal cracks with the grade 2.0. By adjusting the casting speed, heavy reduction was applied at higher solid fraction. Center segregation grade was remarkably reduced from 2.0 to 1.0, center porosity grade and shrinkage cavity grade were significantly decreased to 0.5, and the internal cracks was eliminated.
周伟基,沙玉峰,路 辉,赵军普,刘 浏. GCr15连铸大方坯凝固终点及末端的大压下区间[J]. , 2018, 53(1): 41-45.
ZHOU Wei-ji,SHA Yu-feng,LU Hui,ZHAO Jun-pu,LIU Liu. Solidification end and heavy reduction zone for continuous casting bloom GCr15. Iron and Steel, 2018, 53(1): 41-45.
Flemings Merton C. Our Understanding of Macrosegregation: Past and Present [J]. ISIJ International, 2000, 40(9): 833-841
[1]
Flemings Merton C. Our Understanding of Macrosegregation: Past and Present [J]. ISIJ International, 2000, 40(9): 833-841
[2]
Domitner J, Wu M, Kharicha A, Ludwig A, Kaufmann B, Reiter J, Schaden T. Modeling the effect of strand surface bulging and mechanical soft reduction on the macrosegregation formation in steel continuous casting[J]. Metallurgical and Materials Transactions A, 2014, 45 (3): 1415-1434
[2]
Domitner J, Wu M, Kharicha A, Ludwig A, Kaufmann B, Reiter J, Schaden T. Modeling the effect of strand surface bulging and mechanical soft reduction on the macrosegregation formation in steel continuous casting[J]. Metallurgical and Materials Transactions A, 2014, 45 (3): 1415-1434
Takahashi T.Solidification and segregation of ingots [J]. Iron and steel, 1982, (3): 57~61
[4]
Takahashi T.Solidification and segregation of ingots [J]. Iron and steel, 1982, (3): 57~61
[5]
Suzuki K, Miyamoto T. Study on the formation of left double quote and right double quote segregation in steel ingot [J]. Transactions ISIJ, 1978, 18(2): 80-89
[5]
Suzuki K, Miyamoto T. Study on the formation of left double quote and right double quote segregation in steel ingot [J]. Transactions ISIJ, 1978, 18(2): 80-89
[6]
RalfThome, Klaus Harste. Principles of billet soft-reduction and consequences for continuous casting [J]. ISIJ International, 2006, 46(12): 1839-1844
[6]
RalfThome, Klaus Harste. Principles of billet soft-reduction and consequences for continuous casting [J]. ISIJ International, 2006, 46(12): 1839-1844
Zhongting MA, Dieter JANKE. Characteristics of oxide precipitation and growth during solidification of deoxidized steel [J]. ISIJ International, 1998, 38(1): 46-52
[8]
Zhongting MA, Dieter JANKE. Characteristics of oxide precipitation and growth during solidification of deoxidized steel [J]. ISIJ International, 1998, 38(1): 46-52
[9]
MengYa, Thomas Brain G. Heat transfer and solidification model of continuous slab casting: CON1D [J]. Metallurgical and materials transactions B, 2003, 34B(5): 685-705
[9]
MengYa, Thomas Brain G. Heat transfer and solidification model of continuous slab casting: CON1D [J]. Metallurgical and materials transactions B, 2003, 34B(5): 685-705
[10]
ALIZADEH Mostafa, JAHROMI Ahmad Jenabali, ABOUALI Omid. A new semi-analytical model for prediction of strand surface temperature in continuous casting of steel in the mold region [J].ISIJ International, 2008, 48(2): 161-169
[10]
ALIZADEH Mostafa, JAHROMI Ahmad Jenabali, ABOUALI Omid. A new semi-analytical model for prediction of strand surface temperature in continuous casting of steel in the mold region [J].ISIJ International, 2008, 48(2): 161-169