Method and device for controlling slab center segregation
A slab and steel type technology, applied in the field of controlling slab center segregation, can solve the problems of ineffective control of slab center segregation and low control precision
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Embodiment 1
[0049] This embodiment provides a method for controlling slab center segregation, such as figure 1 As shown, the method includes:
[0050] S101, judging the type of steel, and determining the reduction amount according to the type of steel;
[0051] In this step, because different steel grades have different reduction amounts, it is necessary to determine the type of steel type, and determine the reduction amount according to the steel type type.
[0052] Specifically, obtain the mass percent of each composition of described steel grade; Described steel grade composition comprises: C, Mn, Ni, Si, Cr, Mo, S; Then just can calculate [C%] eq value according to formula (1) :
[0053] [C%]eq=[C%]+0.02*[Mn%]+0.04*[Ni%]-0.1*[Si%]-0.04*[Cr%]-0.1[Mo%]-0.7*[S% ]
[0054] (1)
[0055] When [C%]eq≤0.07, it is determined that the steel type is low-carbon steel;
[0056] When 0.07<[C%]eq≤0.16, it is determined that the steel type is peritectic steel;
[0057] When 0.16<[C%]eq≤0.20, i...
Embodiment 2
[0075] Corresponding to Embodiment 1, this embodiment provides a device for controlling slab center segregation, such as figure 2 As shown, the device includes: a judgment unit 21, a determination unit 22, a first control unit 23 and a second control unit 24; wherein,
[0076] Since different steel grades have different reductions, the judging unit 21 needs to judge the type of steel, and determine the reduction according to the type of steel.
[0077] Specifically, the judging unit 21 obtains the mass percent of each composition of the steel grade; the steel grade composition includes: C, Mn, Ni, Si, Cr, Mo, S; then just can calculate [C% according to formula (1) ]eq value:
[0078] [C%]eq=[C%]+0.02*[Mn%]+0.04*[Ni%]-0.1*[Si%]-0.04*[Cr%]-0.1[Mo%]-0.7*[S% ] (1)
[0079] When [C%]eq≤0.07, it is determined that the steel type is low-carbon steel;
[0080] When 0.07<[C%]eq≤0.16, it is determined that the steel type is peritectic steel;
[0081] When 0.16<[C%]eq≤0.20, it is d...
Embodiment 3
[0095] In practical application, when using the method provided in Example 1 and the device provided in Example 2 to control the central segregation of a 230×1600mm medium carbon continuous casting slab in a steel plant, the casting speed is controlled at 1.2 m / min, the degree of superheat is 25°C, the details are as follows:
[0096] First, obtain the mass percent of each composition of described steel grade; Described steel grade composition comprises: C, Mn, Ni, Si, Cr, Mo, S; Then just can calculate [C%] eq value according to formula (1):
[0097] [C%]eq=[C%]+0.02*[Mn%]+0.04*[Ni%]-0.1*[Si%]-0.04*[Cr%]-0.1[Mo%]-0.7*[S% ]
[0098] Finally, [C%]eq is calculated to be 0.018%, and the steel grade is determined to be medium carbon steel. In this embodiment, the reduction is 5 mm; at the same time, under the condition of ensuring the reduction, the reduction rate is not greater than 1.5 mm / m.
[0099] After the reduction amount is determined, the solid phase ratio of the steel...
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