Method for improving center segregation of carbon steel in super-thick slab
A technology for thick slab and carbon steel, which is applied in the field of improving the center segregation of carbon steel in ultra-thick slabs, can solve the problem that the influence of the solidification characteristics of the W-shaped liquid core of slab continuous casting is not considered, and the internal quality of the ultra-thick slab cannot be effectively improved. and other problems, to achieve the effect of obvious internal quality improvement, easy realization and simple process
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Embodiment 1
[0034] For medium-carbon steel with a thickness specification of 460mm and a carbon content of 0.166wt%, the composition of the steel grade is as follows: C-0.166, Si-0.222, Mn-0.675, P-0.020, S-0.004, Als-0.028. In the continuous casting process, the ultra-thick slab is pressed, and the specific steps are as follows:
[0035] (1) When 0.05 ≤ fs <0.15, the reduction is 4.5 mm; when 0.15 ≤ fs <0.35, the reduction is 5.5 mm; when 0.35 ≤ fs <0.70, the reduction is 6.5 mm; when 0.70 ≤ fs ≤ 1.0, the reduction is 8.0mm; when dt≤70℃, the reduction is 5.0mm.
[0036] (2) When this scheme is adopted, the central segregation ratings of the 1 / 4, 1 / 2, and 3 / 4 positions of the width of the slab are all C0.5, and the internal quality of carbon steel in the ultra-thick slab is significantly improved.
Embodiment 2
[0038] For medium-carbon steel with a thickness specification of 480mm and a carbon content of 0.165wt%, the composition of the steel grade is as follows: C-0.165, Si-0.252, Mn-0.694, P-0.022, S-0.006, Als-0.044. In the continuous casting process, the ultra-thick slab is pressed, and the specific steps are as follows:
[0039] (1) When 0.05 ≤ fs <0.15, the reduction is 1 mm; when 0.15 ≤ fs <0.35, the reduction is 1.5 mm; when 0.35 ≤ fs <0.70, the reduction is 2.5 mm; when 0.70 ≤ fs ≤1.0 , the reduction is 3mm; when dt≤70℃, the reduction is 1.5mm.
[0040] (2) When this scheme is adopted, the central segregation ratings of 1 / 4, 1 / 2, and 3 / 4 of the width of the slab are all C1.0, and the internal quality of carbon steel in the ultra-thick slab is significantly improved.
[0041] The method of the present invention aims at the continuous casting characteristics of the W-shaped solidification end of the ultra-thick slab, taking the 1 / 2 position of the slab width as the calculatio...
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