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A kind of molten steel flux for low carbon steel

A technology for low-carbon steel and molten steel, applied in the field of continuous casting molten steel flux and low-carbon steel continuous casting molten steel flux, which can solve problems such as improper melting speed of molten steel flux in the crystallizer, slag curling defect of continuous casting billet, etc., and achieve slag removal Good condition, good spreadability, small slag effect

Active Publication Date: 2016-09-14
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a molten steel flux for low-carbon steel, which mainly solves the technical problem in the prior art that the melting speed of the molten steel flux in the crystallizer is improper and the molten steel is involved to cause the defect of slag curling in the continuous casting slab

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1, the weight percentage of the chemical composition of the molten steel flux is: CaO 33.63%, MnO 2 6.68%, SiO 2 34.10%, Al 2 O 3 3.32%, MgO 3.79%, Na 2 O 1.06%, Fe 2 O 3 0.91%, Li 2 O 2.02%, B 2 O 3 2.38%, the rest are unavoidable impurities. The physical performance parameters of mold flux: melting point is 1098℃, viscosity at 1300℃ is 0.301Pa·S, binary alkalinity value (CaO / SiO 2 ) Is 0.986.

Embodiment 2

[0033] In Example 2, the weight percentage of the chemical composition of the mold powder is: CaO 35.56%, MnO 2 5.08%, SiO 2 36.30%, Al 2 O 3 5.87%, MgO 1.54%, Na 2 O 1.76%, Fe 2 O 3 0.81%, Li 2 O 2.03%, B 2 O 3 2.98%, the rest are unavoidable impurities. The physical properties of mold powder: melting point is 1100℃, viscosity at 1300℃ is 0.35 Pa·S, binary alkalinity value (CaO / SiO 2 ) Is 0.98.

[0034] The molten steel flux of the present invention has good spreadability and less smoke. After the molten steel flux is added, the mold slag surface slag condition is good, no adhesion occurs, no crusting and pilling, and small slag; the molten steel flux has low carbon content and does not cause steel The recarburization of the liquid keeps the physical parameters stable during use, which has a significant effect on preventing slag inclusion defects in the slab.

[0035] The molten steel flux of the present invention introduces a certain amount of MnO 2 , Fe 2 O 3 , To ensure tha...

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PUM

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Abstract

The invention relates to a molten steel solvent for low-carbon steel and belongs to the technical field of steelmaking and continuous casting. The molten steel solvent for the low-carbon steel mainly solves the technical problem that solvent components in the prior art are prone to being involved in molten steel to result in the defect of slag entrapment of continuous casting billets. According to the technical scheme, a continuous casting crystallizer powder for the low-carbon steel is composed of, by weight percentage, 32-40% of CaO, 3-8% of MnO2, 30-40% of SiO2, 3-7% of Al2O3, 2-5% of MgO, 0-3% of CF, 0-2% of Na2O, 0-1% of Fe2O3, 1-3% of Li2O, 2-5% of B2O3 and inevitable impurities as balance; the binary basicity (CaO / SiO2) of the continuous casting crystallizer powder for the low-carbon steel is 0.80-1.33. The continuous casting crystallizer powder for the low-carbon steel is mainly applied to internal lubrication and protection of a crystallizer during production of the low-carbon steel through a continuous slab caster.

Description

Technical field [0001] The invention relates to a molten steel continuous casting flux in the production of molten steel by a slab caster, in particular to a continuous casting molten steel flux for low carbon steel, belonging to the technical field of steelmaking and continuous casting. Background technique [0002] Continuous casting is a major process in the steelmaking process and a key process that determines the quality of the cast slab. The role of molten steel flux in slab continuous casting is mainly manifested in heat preservation, heat transfer, lubrication, isolation of air and adsorption of inclusions. The surface quality defects of the continuous casting slab, especially the longitudinal cracks, adhesion, slag inclusion, and vibration marks of the slab, depend to a large extent on the molten steel flux used in the continuous casting mold. Therefore, molten steel continuous casting flux with suitable performance is very important for continuous casting. [0003] The ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 郑开沛洪建国
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD