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Composite deoxidizer and preparation and use methods thereof

A composite deoxidizer and modifier technology, which is applied in the field of iron and steel metallurgy, can solve the problems of poor castability and high inclusion degradation rate, and achieve the effects of improving poor castability, reducing the total amount, 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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] 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 inclusion

Method used

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Example Embodiment

[0039] The present invention also provides a method of preparing the above low-carbon low silicon steel aluminum composite deoxidating agent, including the steps of:

[0040] A. According to each component, each component is grinded to 3 mm or less, and the dry material is mixed with stirring 8 to 11 minutes;

[0041] B, using a strong engraving machine dry press to prepare the ball mass, the pressure is 12 ~ 14GPa, specification 20 ~ 35 mm;

[0042] C. Sieve the ball blanket with a screen of no less than 10 mm sieve holes, a pellet having a particle diameter of not less than 10 mm is a composite deoxidizer.

[0043] In the preparation method step A, an appropriate amount of binding agent can be added as needed.

[0044] Based on the above studies, the present invention also provides the method of using low-carbon low silicon steel aluminum composite deoxidation agents according to the characteristics of the low-carbon low silicon steel aluminum ferrous agent provided in the prese...

Example Embodiment

[0052] Example 1

[0053] In this embodiment, the desoxitizer group employed is (mass percent): metal aluminum: 62%; 7AL 2 O 3 · 12CAO pre-measuring: 10%, calcium carbonate: 13%, Fe: 14%, the rest is a trace impurity element; the calcium roof residue modifier group has become (mass percentage): Cac 2 : 55%, Al 2 O 3 : 17%, CAO: 27%, s ≤ 0.2%, P ≤ 0.1%, the rest is inevitable impurities.

[0054] The primary steel water was carried out with a half steel after vanadium-containing iron water, wherein the semi-steel containing 3.54% C, 0.041% Mn, 0.063% P, 0.007% S, 0.063% by weight percentage meter. 0.03% of V, and traces of Cr, Si, and Ti, the margin is iron and inevitable impurities.

[0055] Specific steps:

[0056] A. A 220-ton of the above-mentioned steel is added to the top-filled transformer of 220 tons (nominal capacity), and the above-mentioned semi-steel is primarily refined into a steel water using the function of the top-up converter. When the steel was primarily found to...

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Abstract

The invention discloses a composite deoxidizer and preparation and use methods thereof, and belongs to the technical field of ferrous metallurgy. The invention provides an aluminum composite deoxidizer for improving the problems of poor castability and high inclusion degradation rate of aluminum deoxidized steel. The composite deoxidizer comprises 60-70% of metal aluminum, 5-15% of 7Al2O3.12CaO pre-melted slag, 10-20% of calcium carbonate, 10-20% of Fe and the balance of trace impurity elements. The invention provides the aluminum composite deoxidizer by in-depth study of the behavior of inclusions in steel after aluminum deoxidization. By adding the deoxidizer in the converter tapping process, the proportion of large inclusions in steel can be effectively reduced, the inclusions can be modified, the total amount of inclusions can be reduced without prolonging the refining time, and the problems of poor castability and high inclusion degradation rate in the production process of the steel can be improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a composite deoxidizer and a preparation and use method thereof. Background technique [0002] Aluminum is currently the most commonly used deoxidizer in steel production. Aluminum has a strong affinity with oxygen, high deoxidation efficiency, relatively low cost, and its deoxidized products are easy to float up and be removed, so it is often used as a final deoxidizer to obtain a high degree of cleanliness of molten steel. In addition, fine-grained steel can be produced economically by deoxidizing aluminum. [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...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/00
CPCC21C7/06C21C7/0087
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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