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Method for preparing low-cost oriented silicon steel by utilization of continuous annealing

A low-cost technology of grain-oriented silicon steel, applied in the field of preparing low-cost grain-oriented silicon steel by continuous annealing, can solve the problems of long secondary recrystallization annealing time, etc., and achieve the effect of shortening production time, shortening process flow, and improving final performance

Inactive Publication Date: 2015-08-19
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

However, the secondary recrystallization in this preparation method can only occur during the slow heating process, and the secondary recrystallization annealing time is longer

Method used

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  • Method for preparing low-cost oriented silicon steel by utilization of continuous annealing
  • Method for preparing low-cost oriented silicon steel by utilization of continuous annealing
  • Method for preparing low-cost oriented silicon steel by utilization of continuous annealing

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Comparison scheme
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Embodiment Construction

[0029] 1 process route

[0030] Smelting and continuous casting→hot rolling→primary cold rolling→intermediate annealing→secondary cold rolling→continuous annealing

[0031] 2 process parameters

[0032] 2.1 Smelting and continuous casting

[0033] The composition of the grain-oriented silicon steel obtained after smelting is shown in Table 2, and the original thickness of the slab is 30mm.

[0034] Table 2 Composition (wt%)

[0035] Si

C

mn

S

Al

3

0.05

0.05

0.02

0.017

[0036] 2.2 Hot rolling process

[0037] The original cast slab is kept at 1200°C for 30 minutes, and after heat treatment, it is hot-rolled five times to a hot-rolled plate with a thickness of 2mm.

[0038] 2.3 Primary cold rolling process

[0039] Preheating at 150°C for 10 minutes, the reduction rate of primary cold rolling is controlled to three parameters of 77.5%, 71.5%, and 64%. The thicknesses of the steel plates after one cold rolling are 0.4...

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Abstract

The invention provides a method for preparing low-cost oriented silicon steel by utilization of continuous annealing, wherein the technological line comprises the following steps of smelting and casting, hot rolling, primary cold rolling, intermediate annealing, secondary cold rolling and continuous annealing. According to the method provided by the invention, a normalizing working procedure is eliminated on the premise of heating the oriented silicon steel at low temperature, and meanwhile the slow heating and high-temperature long-time annealing in the traditional technology is replaced by the continuous annealing, so that the production period is greatly reduced, and the purposes of reducing cost and improving efficiency are achieved. The magnetic performance of a finally prepared product is much higher than that of traditional non-oriented silicon steel, and is slightly lower than that of commercial oriented silicon steel. In some fields that the oriented silicon steel and the non-oriented silicon steel can be used in common, a better effect can be realized.

Description

technical field [0001] The invention relates to a production method of oriented silicon steel, in particular to a production method for preparing oriented silicon steel with short flow, low cost and low energy consumption. Background technique [0002] As one of the core materials of various motors and transformers, silicon steel is mainly used to make iron cores. With the continuous development of the electromechanical industry, the demand for silicon steel is also increasing. Oriented silicon steel is known as a "handicraft" in the steel industry, and its excellent performance has always been respected. However, the production process is long, the process is difficult, the energy consumption and material consumption are large, and the preparation cost is high. At present, the country attaches great importance to the work of energy saving and consumption reduction, and the National Development and Reform Commission has put forward the requirement of "taking resolute measu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/12C21D6/00
Inventor 焦懿德杨平秦镜张宁
Owner UNIV OF SCI & TECH BEIJING
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