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Low-carbon low-silicon steel aluminum composite deoxidizer and preparation and use methods thereof

A composite deoxidizer, low-carbon and low-silicon technology, applied in the field of iron and steel metallurgy, can solve the problems of high inclusion degradation rate and poor castability, and achieve the effects of reducing the total amount of inclusions, improving poor castability, and reducing the proportion of large inclusions

Pending Publication Date: 2021-12-10
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Claims
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Problems solved by technology

[0010] Aiming at the problems of the prior art, the present invention develops a deoxidizer and process through in-depth research on the behavior of inclusions in steel after aluminum deoxidation, so as to effectively reduce the proportion of large inclusions in steel and modify inclusions without extending Reduce the total amount of inclusions while keeping the refining time, and improve the problems of poor castability and high inclusion degradation rate in the current production process of this type of steel

Method used

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  • Low-carbon low-silicon steel aluminum composite deoxidizer and preparation and use methods thereof

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preparation example Construction

[0041] The present invention also provides a preparation method of the above-mentioned aluminum composite deoxidizer for low-carbon and low-silicon steel, which comprises the following steps:

[0042] A. Take each component according to the proportion, grind each component to less than 3mm, mix and stir the dry material for 8-11 minutes and mix well;

[0043] B. Prepare the pellet billet by dry-pressing the ball with a powerful briquetting machine, the pressure is 12-14GPa, and the size is 20-35mm;

[0044] C. Sieve the pellets with a sieve with a pore size of not less than 10 mm, and select pellets with a particle size of not less than 10 mm as the composite deoxidizer.

[0045] In step A of the above preparation method, an appropriate amount of binder can be added as required.

[0046] Based on the above research, and according to the characteristics of the low-carbon and low-silicon steel-aluminum composite deoxidizer provided by the invention, the present invention also p...

Embodiment 1

[0055] In the present embodiment, the deoxidizer adopted is composed of (mass percentage): metal aluminum: 54.6%; 7Al 2 o 3 12CaO pre-melted slag: 12.3%, passivation CaO: 17.1%, Fe: 15%, and the rest are trace impurity elements; the composition of calcium-based top slag modifier is (mass percentage): CaC 2 : 46%, Al 2 o 3 : 24%, CaO: 28%, S≤0.2%, P≤0.1%, and the rest are unavoidable impurities.

[0056] The semi-steel after vanadium extraction and desulfurization of vanadium-containing titanium hot metal is used as raw material for primary molten steel, wherein the semi-steel contains 3.51% of C, 0.040% of Mn, 0.063% of P, 0.007% of S, 0.03% V and traces of Cr, Si and Ti, the balance being iron and unavoidable impurities.

[0057] Specific steps:

[0058] A. Add 235 tons of the above-mentioned semi-steel into a 220-ton (nominal capacity) top-bottom re-blowing converter, and use the function of the top-bottom re-blowing converter to decarburize the above-mentioned semi-ste...

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Abstract

The invention discloses a low-carbon low-silicon steel aluminum composite deoxidizer and preparation and use methods thereof, and belongs to the technical field of ferrous metallurgy. In order to solve the problems of poor castability and a high inclusion degradation rate of low-carbon low-silicon steel seeds, the invention provides the low-carbon low-silicon steel aluminum composite deoxidizer. The low-carbon low-silicon steel aluminum composite deoxidizer comprises 50-60% of metal aluminum, 10-20% of 7Al2O3.12CaO pre-melted slag, 10%-20% of passivated CaO, 10-20% of Fe and the balance of trace impurity elements. The invention provides the low-carbon low-silicon steel aluminum composite deoxidizer by deeply researching behaviors of inclusions in steel subjected to aluminum deoxidation, and the deoxidizer is added in the converter tapping process, so that the proportion of large inclusions in the steel can be effectively reduced, the inclusions are modified, the total amount of the inclusions is reduced under the condition that the refining time is not prolonged, and the problems of poor castability and the high inclusion degradation rate in the production process of the steel grade at present are solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a low-carbon and low-silicon steel-aluminum composite deoxidizer and a preparation and use method thereof. Background technique [0002] Low-carbon and low-silicon steel (such as SPH series) steel is mainly used for household appliances and instrument shells, as deep-pressing and panel forming and other deep-processing materials, requiring high stamping performance, aluminum deoxidation is used when smelting low-carbon and low-silicon steel. [0003] The product of aluminum deoxidation is mainly solid Al 2 o 3 , which mainly involves three aspects: 1) Al 2 o 3 Particle nucleation; 2) Al 2 o 3 Aggregation and growth of nucleating particles; 3) Al 2 o 3 Separation and removal of inclusions. al 2 o 3 The quantity, shape and size distribution of inclusions in the steel after deoxidation have a great influence on the cleanliness of molten steel,...

Claims

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Application Information

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IPC IPC(8): C21C7/06
CPCC21C7/06
Inventor 周伟王建郑之旺吴国荣王敏莉
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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