Rolling method for producing phase changes in finish rolling process of low-grade non-oriented silicon steel

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...

AI Technical Summary

Problems solved by technology

[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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