Method for preparing oriented silicon steel thin strip using aluminum nitride as inhibitor

Abstract

The invention relates to the field of metallurgy science, in particular to a method for preparing an oriented silicon steel thin strip. The method comprises the following steps of: firstly smelting raw materials in an intermediate frequency vacuum induction furnace to form liquid steel; then carrying out continuous casting on the liquid steel formed by smelting by using a double-roller continuouscasting machine to form a thin strip; and finally carrying out continuous cooling and continuous normalizing treatment on the thin strip so as to form a large number of aluminum nitride inhibitors which are distributed in the oriented silicon steel thin strip in a dispersion mode and have a size range of 30 to 100nm. The manufacturing process is simple, the high-temperature reheating solutionizing process is saved, the advantages and potential of double-roller thin strip continuous casting technology on the regulation and control of the oriented silicon steel inhibitor can be sufficiently exerted, the material point of the aluminum nitride inhibitor with satisfied forms and distribution characteristics can be obtained and necessary conditions are provided for secondary recrystallization in the subsequent high-temperature annealing process.

Description

technical field

[0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing an oriented silicon steel thin strip using aluminum nitride as an inhibitor. Background technique

[0002] Oriented silicon steel (including ordinary oriented silicon steel and high magnetic induction oriented silicon steel) is a soft magnetic material containing about 3% silicon. Due to its strong {110}(001) Gauss texture, it has low iron loss and High magnetic induction intensity, mainly used in transformer core. It is the only product produced by the secondary recrystallization phenomenon in the iron and steel industry, and it is a relatively successful application of texture control technology in industrial production. The existing production process of oriented silicon steel is: smelting → continuous casting → heating → hot rolling → normalization treatment → pickling → cold rolling → intermediate annealing → secondary cold rolling → decarburizatio...

Examples

Embodiment 1

[0017] (1) Smelting and continuous casting: firstly, the raw materials are smelted in an intermediate frequency vacuum induction furnace, and the molten steel formed by smelting is exported through twin-roll continuous casting machine after continuous casting. The chemical composition of strip blank and thin strip blank is Si 3.1%, C 0.053%, N 0.004%, Als 0.034% by weight percentage, and the balance is Fe and unavoidable impurities;

[0018] (2) Continuous cooling: continuous cooling of the continuously cast thin strip, the cooling rate is 200°C / s, and the final cooling temperature is 1000°C;

[0019] (3) Continuous normalization: after continuous cooling, the thin strip blank is kept at 920°C for 2 minutes, and then cooled to below 100°C at a cooling rate of 25°C / s; The size range of the diffusely distributed aluminum nitride inhibitor particles is 30~100nm;

[0020] Such as figure 2 As shown in this embodiment, the precipitates in the grain-oriented silicon steel thin str...

Embodiment 2

[0022] (1) Smelting and continuous casting: firstly, the raw materials are smelted in an intermediate frequency vacuum induction furnace, and the molten steel formed by smelting is exported through twin-roll continuous casting machine after continuous casting. The chemical composition of strip blank and thin strip blank is Si 2.8%, C 0.04%, N 0.003%, Als 0.04% by weight percentage, and the balance is Fe and unavoidable impurities;

[0023] (2) Continuous cooling: continuous cooling of the continuously cast thin strip, the cooling rate is 100°C / s, and the final cooling temperature is 1050°C;

[0024] (3) Continuous normalization: after continuous cooling, the thin strip blank is kept at 950°C for 2 minutes, and then cooled to below 100°C at a cooling rate of 20°C / s to obtain the finished oriented silicon steel strip blank, which is formed in the thin strip blank The size range of the dispersed aluminum nitride inhibitor particles is 30~100nm.

Embodiment 3

[0026] (1) Smelting and continuous casting: firstly, the raw materials are smelted in an intermediate frequency vacuum induction furnace, and the molten steel formed by smelting is exported after continuous casting by a twin-roller continuous casting machine. The chemical composition of billet and thin strip billet is Si 3.4%, C 0.07%, N 0.008%, Als 0.02% by weight percentage, and the balance is Fe and unavoidable impurities;

[0027] (2) Continuous cooling: continuous cooling of the continuously cast thin strip billet, the cooling rate is 300°C / s, and the final cooling temperature is 950°C;

[0028] (3) Continuous normalization: After continuous cooling, the thin strip blank is kept at 900°C for 5 minutes, and then cooled to below 100°C at a cooling rate of 40°C / s to obtain the finished oriented silicon steel thin strip blank, which is formed in the thin strip blank The size range of the dispersed aluminum nitride inhibitor particles is 30~100nm.

technical field

[0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing an oriented silicon steel thin strip using aluminum nitride as an inhibitor. Background technique

[0002] Oriented silicon steel (including ordinary oriented silicon steel and high magnetic induction oriented silicon steel) is a soft magnetic material containing about 3% silicon. Due to its strong {110}(001) Gauss texture, it has low iron loss and High magnetic induction intensity, mainly used in transformer core. It is the only product produced by the secondary recrystallization phenomenon in the iron and steel industry, and it is a relatively successful application of texture control technology in industrial production. The existing production process of oriented silicon steel is: smelting → continuous casting → heating → hot rolling → normalization treatment → pickling → cold rolling → intermediate annealing → secondary cold rolling → decarburizatio...

Examples

Embodiment 1

[0017] (1) Smelting and continuous casting: firstly, the raw materials are smelted in an intermediate frequency vacuum induction furnace, and the molten steel formed by smelting is exported through twin-roll continuous casting machine after continuous casting. The chemical composition of strip blank and thin strip blank is Si 3.1%, C 0.053%, N 0.004%, Als 0.034% by weight percentage, and the balance is Fe and unavoidable impurities;

[0018] (2) Continuous cooling: continuous cooling of the continuously cast thin strip, the cooling rate is 200°C / s, and the final cooling temperature is 1000°C;

[0019] (3) Continuous normalization: after continuous cooling, the thin strip blank is kept at 920°C for 2 minutes, and then cooled to below 100°C at a cooling rate of 25°C / s; The size range of the diffusely distributed aluminum nitride inhibitor particles is 30~100nm;

[0020] Such as figure 2 As shown in this embodiment, the precipitates in the grain-oriented silicon steel thin str...

Embodiment 2

[0022] (1) Smelting and continuous casting: firstly, the raw materials are smelted in an intermediate frequency vacuum induction furnace, and the molten steel formed by smelting is exported through twin-roll continuous casting machine after continuous casting. The chemical composition of strip blank and thin strip blank is Si 2.8%, C 0.04%, N 0.003%, Als 0.04% by weight percentage, and the balance is Fe and unavoidable impurities;

[0023] (2) Continuous cooling: continuous cooling of the continuously cast thin strip, the cooling rate is 100°C / s, and the final cooling temperature is 1050°C;

[0024] (3) Continuous normalization: after continuous cooling, the thin strip blank is kept at 950°C for 2 minutes, and then cooled to below 100°C at a cooling rate of 20°C / s to obtain the finished oriented silicon steel strip blank, which is formed in the thin strip blank The size range of the dispersed aluminum nitride inhibitor particles is 30~100nm.

Embodiment 3

[0026] (1) Smelting and continuous casting: firstly, the raw materials are smelted in an intermediate frequency vacuum induction furnace, and the molten steel formed by smelting is exported after continuous casting by a twin-roller continuous casting machine. The chemical composition of billet and thin strip billet is Si 3.4%, C 0.07%, N 0.008%, Als 0.02% by weight percentage, and the balance is Fe and unavoidable impurities;

[0027] (2) Continuous cooling: continuous cooling of the continuously cast thin strip billet, the cooling rate is 300°C / s, and the final cooling temperature is 950°C;

[0028] (3) Continuous normalization: After continuous cooling, the thin strip blank is kept at 900°C for 5 minutes, and then cooled to below 100°C at a cooling rate of 40°C / s to obtain the finished oriented silicon steel thin strip blank, which is formed in the thin strip blank The size range of the dispersed aluminum nitride inhibitor particles is 30~100nm.

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