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Silicon-calcium-barium-magnesium desoxidant for steelmaking and/or electroslag

A technology of deoxidizer, silicon-calcium-barium, applied in the field of silicon-calcium-barium-magnesium deoxidizer for steelmaking and/or electroslag, which can solve the problems of flammability, small specific gravity, and low melting point, so as to improve utilization efficiency and be easy to float and remove , good deoxidation effect

Inactive Publication Date: 2015-03-25
ZHONGYUAN SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Calcium and magnesium are ideal deoxidizing and desulfurizing agents, but due to their low melting point, flammability, small specific gravity, and high vapor pressure, they are easy to oxidize and burn on the slag surface, so it is difficult to directly add them to molten slag and molten steel, and cannot achieve deoxidation , the role of desulfurization
The slag system used for electroslag remelting generally contains 15-35% Al 2 o 3 , Al in slag 2 o 3 activity a Al2O3 High, the deoxidation efficiency of aluminum is not high, and it is easy to make the residual aluminum in the steel high (Al≥0.015%)
For steel containing nitrogen ≥ 0.10%, AlN inclusions are likely to be generated by aluminum deoxidation, which reduces the plasticity and toughness of the steel

Method used

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  • Silicon-calcium-barium-magnesium desoxidant for steelmaking and/or electroslag

Examples

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Embodiment 1

[0020] A calcium-based low-aluminum deoxidizer for steelmaking and / or electroslag remelting, expressed in weight percent, the components of the deoxidizer and the contents of each component are: 25% of silicon, 26% of calcium, and 8% of barium , magnesium is 4%, rare earth is 2%, phosphorus is 0.023%, sulfur is 0.032%, carbon is 1%, iron is 34%, and the rest are impurities. After making, the specific gravity of the deoxidizer was measured to be 4.1 g / cm 3 .

Embodiment 2

[0022] A calcium-based low-aluminum deoxidizer for steelmaking and / or electroslag remelting, expressed by weight percentage, the components of the deoxidizer and the contents of each component are: 22% for silicon, 37% for calcium, and 12% for barium , Magnesium is 3%, rare earth is 3%, phosphorus is 0.026%, sulfur is 0.029%, carbon is 0.5%, iron is 22%, and the rest are impurities. After the production is completed, the specific gravity of the deoxidizer is 3.4 g / cm 3 .

Embodiment 3

[0024] A calcium-based low-aluminum deoxidizer for steelmaking and / or electroslag remelting, expressed by weight percentage, the composition and content of each component of the deoxidizer are: 35% for silicon, 12% for calcium, and 15% for barium , magnesium is 2%, phosphorus is 0.027%, sulfur is 0.031%, carbon is 1.5%, iron is 35%, and the rest are impurities. After the production is completed, the specific gravity of the deoxidizer is 4.4 g / cm 3 .

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Abstract

The invention relates to a silicon-calcium-barium-magnesium desoxidant for steelmaking and / or electroslag. The desoxidant is composed of the following chemical components in mass percent: 20-50% of Si, 10-40% of Ca, 5-20% of Ba, 2-10% of Mg, 0-10% of RE, not larger than 0.030% of P, not larger than 0.040% of S, 0-2% of C and the balance of Fe. The preparation method comprises the following steps: firstly smelting iron and silicon in a melting furnace to an intermediate alloy, adding barium, calcium, magnesium and / or rare earth, melting and casting to an alloy block, and controlling the specific gravity of the silicon-calcium-barium-magnesium desoxidant to 3-5 g / cm<3>. When in use, the silicon-calcium-barium-magnesium desoxidant is directly thrown into a steel furnace and / or an electroslag remelting crystallizer slag bath, the specific gravity of the desoxidant is increased, the vapor pressure is reduced, the desoxidant is deposited at a slag-steel interface to generate a CaO-BaO-SiO2 type impurity, and the CaO-BaO-SiO2 type impurity is larger in granule, lower in melting point, easy to be captured by the slag and easy to float to be removed, so that the cleanness of molten steel is improved.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a silicon-calcium-barium-magnesium deoxidizer for steelmaking and / or electroslag remelting deoxidation and desulfurization, in particular to a silicon-calcium-barium magnesium deoxidizer for steelmaking and / or electroslag remelting Magnesium deoxidizer and its production method are suitable for producing nitrogen-containing steel (N≥0.10%) or steel with low aluminum (Al≤0.010%) content requirements and other steels that are difficult to deoxidize with aluminum, and it has the ability to deoxidize and desulfurize molten steel , while controlling the effect of aluminum ≤ 0.010% in steel. Background technique [0002] Deoxidation in steelmaking is an important link to determine product quality. The level of oxygen content in steel is a measure of purity to a certain extent. Electroslag remelting is a kind of secondary remelting and refining of steel. To reduce the oxygen in ste...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/064C22B9/18
Inventor 高宏生赵东
Owner ZHONGYUAN SPECIAL STEEL