Rolling method for producing phase changes in finish rolling process of low-grade non-oriented silicon steel
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A technology of oriented silicon steel and low grade, which is applied in the field of steel rolling to achieve the effects of ensuring safe production, improving rolling stability, and stabilizing deformation rate
Active Publication Date: 2012-09-19
SHANXI TAIGANG STAINLESS STEEL CO LTD
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[0004]When the actual rolling pressure changes, the system will automatically adjust the position of the actual roll gap, so that the actual rolling pressure is close to the set rolling pressure, so that when the billet is deformed When the resistance changes, the parameters such as the deformation rate of the rolling mill, the exit thickness, and the rolling speed fluctuate greatly, which destroys the flow balance between the stands. When the rolling pressure changes by more than 30%, it has exceeded the automatic adjustment range and exposed The rolling state is unstable, the looper swings greatly, the strip steel cannot run stably in the finishing stand, and accidents of stacking steel, drawing steel, rolling, and scrap steel between stands frequently occur, which reduces the operating rate
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Embodiment 1
[0035] Embodiment 1: The rolling method of rolling DW60
[0036] After the DW60 casting slab enters the slab warehouse of the hot rolling mill, the slab is checked and received. According to the production plan, the slab is transported by the crane to the feeding roller table of the heating furnace. After weighing and checking, the slab is sent to the front of the designated heating furnace by the roller table according to the furnace loading sequence, and then the slab is loaded by the steel loading machine. The blank is sent into the heating furnace for heating.
[0037] 1) Carry out empty furnace with other steel types in the heating furnace, the method of empty furnace is as follows:
[0038]
[0039] 2) The furnace temperature control of each section is as follows:
[0040] 1. Heating section: (Target temperature out of the furnace -50) ± 30 ℃
[0041] Second heating section: (Target temperature + 20) ± 30 ℃
[0042] Soaking section: The target temperature of the f...
Embodiment 2
[0054] Embodiment 2: Rolling method of rolling DW47
[0055] After the DW47 casting slab enters the slab warehouse of the hot rolling mill, the slab is checked and received. According to the production plan, the slab is transported by the crane to the feeding roller table of the heating furnace. After weighing and checking, the slab is sent to the front of the designated heating furnace by the roller table according to the furnace loading sequence, and then the slab is loaded by the steel loading machine. The blank is sent into the heating furnace for heating.
[0056] 1) Carry out empty furnace with other steel types in the heating furnace, the method of empty furnace is as follows:
[0057]
[0058] 2) The furnace temperature control of each section is as follows:
[0059] 1. Heating section: (Target temperature out of the furnace -50) ± 30 ℃
[0060] Second heating section: (Target temperature + 20) ± 30 ℃
[0061] Soaking section: The target temperature of the furna...
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Abstract
The invention provides a rolling method for producing phase changes in the finish rolling process of low-grade non-oriented silicon steel, which belongs to the technical field of steel rolling and is characterized in that the target tapping temperature of a first heating zone of a heating furnace is minus 50 DEG C + / - 30 DEG C, the target tapping temperature of a second heating zone of the heating furnace is 20 DEG C + / - 30 DEG C, and the target tapping temperature of a soaking zone of the heating furnace is + / - 30 DEG C; the rolled thickness of a rough mill is adjusted to 40mm, the outlet temperature of the rough mill is adjusted to be in the range of 950 DEG C to 990 DEG C, and the fifth-pass speed of the rough mill is great than or equal to 4.7m / s; the percentages of reduction of first three racks of a finish milling group are all in the range of 59 percent to 37 percent, and the rolled thicknesses of the first three racks are all in the range of 20mm to 6.5mm; and the inlet temperatures of the first three racks are all in the range of 930 DEG C to 900 DEG C, and the rolling speeds of the first three racks are all in the range of 0.9m / s to 2.9m / s. By adopting the rolling method, the second flow among the racks of the finish mill is prevented from being influenced by changes of the deformation resistance, relative balance is maintained, the rolling stability is improved and safety production is guaranteed.
Description
Technical field: [0001] The invention belongs to the technical field of steel rolling, and the low-grade non-oriented silicon steel refers to DW60 and DW47 silicon steel. Background technique: [0002] Low-grade non-oriented silicon steel varieties have complicated hot rolling processes. The main hot processing processes include billet heating, rough rolling mill rolling, seven-stand finishing mill continuous rolling, coiling, packaging and shipping. [0003] Due to the characteristics of low-grade non-oriented silicon steel, in order to ensure good surface quality of finished products and eliminate corrugated defects on the surface of finished products, in the rolling process of continuous rolling mills, phase transformation must occur during rolling in the finishing rolling process, so that , because the same piece of steel undergoes a transition between the γ and α phase intervals during finish rolling, the phase transition intervals between the two steels are inconsist...
Claims
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Application Information
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