Control method of excellent hot-rolled oriented silicon steel plate shape

A control method and technology for oriented silicon, which are applied in the rolling mill control device, metal rolling, temperature control and other directions, can solve the problems of unexplained influence, etc., and achieve the temperature of the cross section is basically uniform, the heating is sufficient and uniform, and the shape of the plate is excellent. Effect

Active Publication Date: 2021-01-22
MAANSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The invention patent with the notification number CN102744260B: a work roll and its roll shape design method taking into account the strip crown and edge drop control; Work rolls and their usage methods, the above-mentioned application mainly discloses the method of improving the shape of hot-rolled silicon steel sheets from the aspect of roll shape design, but does not explain the influence of post-rolling cooling on the shape of the sheet

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  • Control method of excellent hot-rolled oriented silicon steel plate shape

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Effect test

Embodiment 1

[0039] A method for controlling the shape of an excellent hot-rolled grain-oriented silicon steel sheet in this embodiment, the process is as follows:

[0040] The slabs with qualified components are heated by heating furnace, descaled by high-pressure water, emptied through fixed-width press, rough rolled, put into use by heat preservation cover and side heater, cut head and tail, finish rolling, laminar cooling and crimping process After the process, a hot-rolled grain-oriented silicon steel sheet is obtained.

[0041] Specifically, in this embodiment, the temperature of the slab before entering the heating furnace is 360°C, the temperature of the soaking section of the heating furnace in the S1 stage is 1320°C, and the soaking time is 62 minutes to ensure that the slab is heated sufficiently and evenly, and the temperature difference of each part of the slab is 5°C when it comes out of the furnace. ; After descaling with high-pressure water and emptying the fixed-width pres...

Embodiment 2

[0046] The method for controlling the shape of an excellent hot-rolled oriented silicon steel sheet in this embodiment is basically the same as that in Embodiment 1, except that in this embodiment: the temperature of the slab before entering the heating furnace is 350°C; the soaking section of the heating furnace in the S1 stage The temperature is 1280°C, and the soaking time is 60 minutes;

[0047] S2 rough rolling stage: 1 pass on E1 / R1, 3 passes on E2 / R2, the thickness reduction rate of the first pass of R1 is 42%, and the thickness reduction of the third pass of R2 The rate is 15%. After E2 / R2 is completed, the thickness of the intermediate billet is 35mm, and the temperature is 1142°C; after the intermediate billet passes through the heat preservation cover, the edge heater is used to increase the edge temperature of the intermediate billet by 40°C, and then enters the finish rolling stage;

[0048] In the S3 finish rolling stage, the F1 reduction rate is 50%, the F2 redu...

Embodiment 3

[0051] A method for controlling the shape of an excellent hot-rolled grain-oriented silicon steel sheet in this embodiment is basically the same as in Embodiment 1, except that in this embodiment:

[0052] The temperature of the soaking section of the heating furnace in the S1 stage is 1250°C, the soaking time is 65 minutes, and the temperature difference of each part of the slab is 4°C when it is released from the furnace;

[0053] In the rough rolling stage of S2, E1 / R1 is used for empty pass, and E2 / R2 is used for 5 passes, wherein the thickness reduction rate of the first pass of R2 is 37%, and the thickness reduction rate of the fifth pass of R2 is 15%. After E2 / R2 is completed, the thickness of the intermediate billet is 40mm, and the temperature is 1120°C;

[0054] The key temperature parameters of the hot-rolled grain-oriented silicon steel sheet produced by the above-mentioned preparation method meet the standards and the plate shape is excellent, and the downstream u...

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Abstract

The invention discloses a control method of an excellent hot-rolled oriented silicon steel plate shape, and belongs to the field of hot-rolled oriented silicon steel manufacturing. The method comprises the following steps that S1, a heating furnace is used for heating, specifically, the temperature of a soaking section of the heating furnace is 1250-1320 DEG C, and the soaking time is longer thanor equal to 60 min; S2, rough rolling is conducted, specifically, rough rolling is conducted on an E1/R1 reversible rough rolling machine and an E2/R2 reversible rough rolling machine in sequence, andthe temperature of an intermediate billet is larger than or equal to 1120 DEG C after rough rolling is finished on the E2/R2 reversible rough rolling machine; S3, finish rolling is conducted, specifically, seven-rack continuous rolling is adopted, the pass reduction rate in the F1-F7 continuous rolling process is sequentially reduced, the finish rolling F1 reduction rate is 45-50%, and the F7 reduction rate is 5-10%; and S4, laminar cooling is conducted, specifically, the cooling water amount of a nozzle at the edge of strip steel is smaller than that in the middle. According to the method, the defect that in the prior art, the requirements of a hot-rolled oriented silicon steel raw material for performance and plate shape cannot be considered is overcome, the hot-rolled oriented siliconsteel plate with the excellent plate shape is obtained under the condition that it is guaranteed that all key temperature parameters reach the standard, and the obtained plate shape can guarantee thatthe comprehensive yield from the oriented silicon steel raw material to a finished product is larger than or equal to 91%.

Description

technical field [0001] The invention relates to the technical field of manufacturing hot-rolled oriented silicon steel, in particular to a method for controlling the shape of an excellent hot-rolled oriented silicon steel. Background technique [0002] Due to the high final rolling temperature in the hot rolling process of oriented silicon steel, high-speed rolling is generally used to ensure the final rolling temperature, leaving short time for the operation to adjust the plate shape, and it is difficult to improve the plate shape; and the final rolling temperature and coiling temperature of oriented silicon steel The large temperature difference between them and improper laminar cooling control will further deteriorate the shape of hot-rolled grain-oriented silicon steel. The shape of hot-rolled grain-oriented silicon steel directly affects the yield of downstream pickling and cold rolling processes, and has a decisive impact on the overall yield of the final product. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/38B21B37/00B21B37/74B21B37/76B21B37/16B21B45/08
CPCB21B1/38B21B37/00B21B37/74B21B37/76B21B37/16B21B45/08B21B2001/386B21B2201/00
Inventor 杜军裴英豪施立发成印明徐文祥李轶伦周云
Owner MAANSHAN IRON & STEEL CO LTD
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