Method for controlling internal defects of steel
A technology for internal defects and steel materials, applied in the field of steel rolling, can solve problems such as increased deformation, achieve the effect of reducing rolling passes, reducing production costs, increasing production costs and operational control difficulty
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[0036] Example 1
[0037] Use the following method to roll 360×450mm continuous casting billets into 250×250mm axle steel: First, ensure sufficient soaking time during the heating process of the cast billet (here, the soaking time depends on the billet specifications. In this embodiment, a soaking time of ≥ 1.5 hours) is used to make the inner and outer temperature of the cast slab uniform; then, after the furnace is discharged, the high-pressure water descaling parameters are adjusted to reduce the surface temperature of the cast slab rapidly and control the surface temperature of the cast slab to be more than the core part. The temperature is lower by 100°C to 150°C; then, rolling is performed using the rolling process in Table 2 below.
[0038] In Example 1, the steps to adjust the parameters of high-pressure water descaling are: increase the high-pressure water descaling equipment from 3.2m to 5m, use 12Mpa water pressure for the first 3m to ensure the descaling effect, and us...
Example Embodiment
[0045] Example 2
[0046] Use the following method to roll a 360×450mm cast billet into 260×260mm square steel: First, ensure sufficient soaking time during the heating process of the cast billet (the soaking time depends on the billet specifications, in this embodiment Using a soaking time of ≥ 1.5 hours) to make the inside and outside temperatures of the cast slab uniform; then, after the furnace is discharged, the same method as the method in Example 1 is used to adjust the high-pressure water descaling parameters, so that the surface temperature of the cast slab is rapidly reduced, and the center is controlled. The part has a higher surface temperature of 100℃~150℃; then, the rolling process in Table 3 is used for rolling. In Table 3, the reduction ratio of the sixth pass is 25%, and the shape factor of the deformation zone is 0.64.
[0047] Table 3 Rolling process of 260×260mm square steel using the method of Example 2
[0048]
[0049] 8
[0050] Note: The reduction ...
Example Embodiment
[0052] Example 3
[0053] Use the following method to roll a 360×450mm cast billet into a 230×230mm square steel: First, ensure sufficient soaking time during the heating process of the cast billet (the soaking time depends on the billet specifications, in this embodiment Using a soaking time of ≥ 1.5 hours) to make the inside and outside temperatures of the cast slab uniform; then, after the furnace is discharged, the same method as the method in Example 1 is used to adjust the high-pressure water descaling parameters, so that the surface temperature of the cast slab is rapidly reduced, and the center is controlled. The surface temperature is higher than 100℃~150℃; then, the rolling process in Table 4 is used for rolling. In Table 4, the reduction rate of the sixth pass is 25.4% and the shape factor of the deformation zone is 0.67; the reduction rate of the seventh pass is 25.0% and the shape factor of the deformation zone is 0.66.
[0054] Table 4 Rolling process of 230×230mm s...
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