Control method of natural roll-gap thermal-contraction technique based on bloom
A control method and heat shrinking technology, applied in the field of billet continuous casting roll gap technology, to achieve the effect of improving center segregation and center porosity
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Embodiment ( 1
[0063] (1) Casting machine equipment parameters: full arc-shaped bloom continuous caster, radius 15m, arc section casting roll diameter 220mm, center distance between adjacent casting rolls 210mm, straightening section and horizontal section casting roll diameter 450mm, length of pressing section It is 9200mm, and the distance between the centers of adjacent casting rolls is 1500mm.
[0064] (2) The billet size is 360mm×450mm, the steel type is YQ450NQR1, the continuous casting casting speed is 0.4-0.6m / min, the degree of superheat is 20-35°C, and the continuous casting cooling intensity is 0.321-0.375L / kg. The composition of the steel type is shown in the table 1.
[0065] Table 1
[0066] C
[0067] (3) The roll gap setting of each cooling zone is shown in Table 2.
[0068] Table 2
[0069]
[0070] (4) The roll gap taper and roll gap reduction rate in each cooling zone are shown in Table 3.
[0071] table 3
[0072] Each cooling zone
[0073] (5...
Embodiment ( 2
[0075] (1) The parameters of the casting machine equipment are as in Example (1).
[0076] (2) The billet size is 360mm×450mm, and the steel type is 45 # , the continuous casting casting speed is 0.4-0.8m / min, the degree of superheat is 20-35°C, the continuous casting cooling intensity is 0.373-0.405L / kg, and the steel composition is shown in Table 4.
[0077] Table 4
[0078] C
[0079] (3) The roll gap setting of each cooling zone is shown in Table 5.
[0080] table 5
[0081]
[0082] (4) The roll gap taper and roll gap reduction rate in each cooling zone are shown in Table 6.
[0083] Table 6
[0084] Each cooling zone
[0085] (5) The dimensional error of the wide face of the slab is -0.05% to 1.00%, the dimensional error of the narrow face is -0.50% to 1.05%, the rhomboid deformation rate is 0.02% to 1.00%, and the bulging deformation rate of the slab is 0.00% to 1.10%. The surface defect-free rate is 100%, the slab central segregation rating...
Embodiment ( 3
[0087] (1) The parameters of the casting machine equipment are as in Example (1).
[0088] (2) The billet size is 360mm×450mm, the steel type is 20(C), the casting speed is 0.4~0.7m / min, the superheat is 20~35℃, the continuous casting cooling intensity is 0.415~0.432L / kg, the steel type The ingredients are shown in Table 7.
[0089] Table 7
[0090] C
Si
mn
P
S
0.17~0.23
0.17~0.37
0.35~0.65
0.010~0.025
0.008~0.020
[0091] (3) The roll gap setting of each cooling zone is shown in Table 8.
[0092] Table 8
[0093]
[0094] (4) The roll gap taper and roll gap reduction rate in each cooling zone are shown in Table 9.
[0095] Table 9
[0096] Each cooling zone
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