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A kind of production method of non-oriented electrical steel

A technology of oriented electrical steel and production method, which is applied in the field of electrical steel production, can solve problems such as increasing production cycle and energy loss, and achieve the effects of increasing productivity, saving energy, and increasing heating speed

Active Publication Date: 2017-04-26
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This will not only cause a lot of energy loss, but also increase the production cycle

Method used

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  • A kind of production method of non-oriented electrical steel
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  • A kind of production method of non-oriented electrical steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The weight percent of the chemical composition of the non-oriented electrical steel in the embodiment of the present invention is: C: 0.003%, Si: 1.55%, Mn: 0.22%, P: 0.011%, S: 0.002%, Als: 0.21%, N: 0.0025%, The rest is iron and unavoidable impurity elements.

[0015] The production method of the embodiment of the present invention comprises the following process steps:

[0016] a) Smelting: use converter smelting, RH vacuum refining treatment, the composition of molten steel is controlled according to the above requirements, and continuous casting into billets, the thickness of the slab is 230mm;

[0017] b) Hot rolling to 2.3mm by means of a continuous rolling mill. In the hot rolling process, the steel billet is heated to 1100°C, and rolled out of the furnace. The starting temperature of rough rolling is 1020°C. After rough rolling, finish rolling is carried out, and the finish rolling temperature is 870°C. , Cancel laminar cooling after rolling, use high-frequenc...

Embodiment 2

[0023] The weight percent of the chemical composition of the non-oriented electrical steel in the embodiment of the present invention is: C: 0.005%, Si: 0.95%, Mn: 0.26%, P: 0.021%, S: 0.007%, Als: 0.20%, N: 0.0032%, The rest is iron and unavoidable impurity elements.

[0024] The production method of the embodiment of the present invention comprises the following process steps:

[0025] a) Smelting: Converter smelting, RH vacuum refining treatment, the composition of molten steel is controlled according to the above requirements, and continuous casting into billets with a thickness of 135mm;

[0026] b) Hot rolling to 2.3mm by means of a continuous rolling mill. In the hot rolling process, the steel billet is heated to 1080°C, and rolled out of the furnace. The starting temperature of rough rolling is 1010°C. After rough rolling, finish rolling is carried out, and the finish rolling temperature is 870°C. After rolling, the laminar flow cooling is cancelled, and the temperatu...

Embodiment 3

[0032] The weight percent of the chemical composition of the non-oriented electrical steel in the embodiment of the present invention is: C: 0.004%, Si: 0.45%, Mn: 0.36%, P: 0.024%, S: 0.005%, Als: 0.34%, N: 0.0022%, The rest is iron and unavoidable impurity elements.

[0033] The production method of the embodiment of the present invention comprises the following process steps:

[0034] a) Smelting: Converter smelting, RH vacuum refining treatment, the composition of molten steel is controlled according to the above requirements, and continuous casting into billets, the thickness of the slab is 60mm;

[0035] b) The tandem rolling unit is used to hot-roll to 2.3mm. In the hot-rolling process, the steel billet is heated to 1050°C, and rolled out of the furnace. The rough rolling temperature is 1000°C, and the final rolling temperature is 870°C. Finally, the laminar flow cooling is canceled, and the temperature of the steel plate is raised to 940°C by high-frequency induction ...

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Abstract

The invention discloses a production method of non-oriented electrical steel, which comprises the following steps: adding a high-frequency induction or radiant tube equipment heating technique after a hot-rolling mill train; smelting at most 0.0050 wt% of C, 0.20-1.70 wt% of Si, 0.10-0.5 wt% of Mn, 0.005-0.25 wt% of P, at most 0.015 wt% of S, at most 0.0040 wt% of N, 0.10-0.80 wt% of Als and the balance of Fe and inevitable residual elements, and carrying out continuous casting to obtain a plate blank with the thickness of 30-300mm, wherein the plate blank heating temperature is 950-1150 DEG C, the rough rolling end temperature is 900-1000 DEG C, and the intermediate blank thickness is 10-45mm; after rough rolling, directly carrying out finish rolling by a continuous rolling mill train, and adding high-frequency induction or radiant tube equipment between the finish rolling and coiling to enhance the temperature of the steel plate to 900 DEG C above; and coiling the steel plate, stacking, and slowly cooling for more than 6 hours. The production method effectively utilizes the hot rolling excess heat, thereby greatly saving the energy and enhancing the productivity.

Description

technical field [0001] The invention belongs to the technical field of electrical steel production, in particular to a method for producing non-oriented electrical steel Background technique [0002] Generally, non-oriented electrical steel is usually rolled by a hot rolling mill, and laminar cooling is used after rolling. In order to improve the electromagnetic performance, it is obtained by increasing the recrystallization rate of the hot-rolled sheet. Although the highest finish rolling of traditional hot rolling can be controlled above 850°C to achieve the recrystallization rate of the hot-rolled sheet, due to the thinner thickness of the hot-rolled sheet, there is generally a cooling roller table between the rolling mill and the coiler. After rolling, the steel plate is cooled rapidly, and it drops to about 700°C in about 20 seconds, which cannot fully recrystallize the deformed structure. In addition, the distance between the stands of the continuous rolling mill is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/06C22C33/04C21D8/12C21D8/02
Inventor 张智义高振宇陈春梅李亚东李文权张仁波刘文鹏
Owner ANGANG STEEL CO LTD