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High-viscosity continuous casting protective slag for solving slag inclusion on surface of low-carbon steel

A technology of continuous casting mold slag and high viscosity, which is applied in the field of metallurgical auxiliary materials for steelmaking to ensure the effect of heat preservation

Active Publication Date: 2011-04-20
XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a high-viscosity continuous casting mold flux that solves the problem of surface slag inclusion in low-carbon steel continuous casting. This mold flux can solve the surface slag inclusion defect of low-carbon steel and improve the qualified product Rate

Method used

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  • High-viscosity continuous casting protective slag for solving slag inclusion on surface of low-carbon steel

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Experimental program
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Effect test

Embodiment 1

[0020] A high-viscosity continuous casting mold flux for solving slag inclusion on the surface of low-carbon steel, the raw material ratio and weight percentage are as follows: glass powder: 6.5%, premelt: 57.8%, fluorite: 7.5%, white alkali: 6 %, N330 carbon black: 3%, graphite: 3.5%, R agent: 2%, lithium carbonate: 1%, magnesia 3%, manganese carbonate: 2%, bauxite: 4%, cryolite: 2%, Binder: 1.4%, superplasticizer 0.3%

[0021] The components in the low-carbon steel high-viscosity continuous casting mold flux are calculated by weight percentage: MgO: 3.8%, Fe 2 o 3 : 0.98%, Al 2 o 3 : 7.1%, Na 2 O: 8.9%, F - : 7.2%, MnO: 1.5%, Li 2 O: 0.4%, C: 5.6%, impurities brought in by raw materials: 0.42%, CaO: 29.2, SiO 2 : 34.9, CaO / SiO 2 is 0.84.

[0022] The physical properties of the mold flux are: melting temperature: 1080°C, viscosity at 1300°C: 0.28Pa·s

[0023] The low-carbon steel high-viscosity continuous casting mold slag with this ratio and performance requirement...

Embodiment 2

[0026] A high-viscosity continuous casting mold flux for solving slag inclusion on the surface of low-carbon steel, the raw material ratio and weight percentage are as follows: glass powder: 2%, premelt: 61.1%, fluorite: 6%, white alkali: 4.5 %, N330 carbon black: 3%, graphite: 3.5%, R agent: 1%, lithium carbonate: 1.5%, manganese carbonate: 3%, magnesia 4%, bauxite: 6.5%, cryolite: 1.5%, Binder: 2%, water reducer: 0.4%.

[0027] The components in the low-carbon steel high-viscosity continuous casting mold flux are calculated by weight percentage: MgO: 4.6%, Fe 2 o 3 : 1.15%, Al 2 o 3 : 9.0%, Na 2 O: 6.8%, F -: 5.9%, MnO: 2.2%, Li 2 O: 0.6%, C: 5.6%, impurities brought in by raw materials: 1.05%, CaO: 28.8, SiO 2 : 34.3, CaO / SiO 2 is 0.84.

[0028] The physical properties of the mold slag are: melting temperature: 1090°C, viscosity at 1300°C: 0.37Pa·s. The low-carbon steel high-viscosity continuous casting mold slag with this ratio and performance requirements is used...

Embodiment 3

[0031] A high-viscosity continuous casting mold flux for solving slag inclusion on the surface of low-carbon steel, the raw material ratio and weight percentage are as follows: glass powder: 3.5%, premelt: 58.7%, fluorite: 6%, white alkali: 6% %, N330 carbon black: 3%, graphite: 3.5%, R agent: 1.5%, lithium carbonate: 1.2%, manganese carbonate: 3.5%, magnesia 3.5%, bauxite: 5%, cryolite: 2%, Binder: 2%, water reducer 0.6%.

[0032] The components in the low-carbon steel high-viscosity continuous casting mold flux are calculated by weight percentage: MgO: 4%, Fe 2 o 3 : 1.5%, Al 2 o 3 : 8%, Na 2 O: 8%, F - : 6.5%, MnO: 2%, Li 2 O: 0.5%, C: 5.5%, impurities brought by raw materials: 1.5%, CaO: 28.5%, SiO 2 34%, of which CaO / SiO 2 is 0.84.

[0033] The premelt material of the present invention (its composition and weight percentage are composed of: SiO 2 42~45%, CaO36~39%, MgO 1.5~3.5%, Fe 2 o 3 Not more than 1%, Al 2 o 3 4~6%,Na 2 O 5~7%, F 2~4%) 58~66%, cement ...

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Abstract

The invention discloses high-viscosity continuous casting protective slag for solving slag inclusion on the surface of low-carbon steel. The protective slag comprises the following raw materials by weight percent: 0%-7% of glass powder, 50%-70% of premelting material, 5.5%-8.5% of fluorite, 4%-8% of dietary alkali, 3% of N330 carbon black, 3.5% of graphite, 0%-3% of R agent, 0.5-2% of lithium carbonate, 2%-5% of manganese carbonate, 2%-5% of magnesite, 3%-7% of bauxite, 1%-3% of cryolite, 1%-3% of adhesive, and 0.3%-1% of water-reducing agent. By utilizing the high-viscosity continuous casting protective slag, mainly on the basis of CaO and SiO2, a certain amount of fluxing agents such as the lithium carbonate, the fluorite, the dietary alkali and the like and a certain amount of carbon materials such as carbon black and graphite are externally added, thus the viscosity is improved and the surface tension is increased; and under the same technique condition, slag inclusion on the surface of a steel billet can be effectively prevented.

Description

technical field [0001] The invention belongs to the technical field of metallurgical auxiliary materials for steelmaking, and in particular relates to a high-viscosity continuous casting mold slag used in steelmaking to solve slag inclusion on the surface of low-carbon steel. Background technique [0002] Surface (subcutaneous) slag inclusion is one of the common surface defects of continuous casting slabs, which is mainly caused by mold slag, nozzle deposits and other non-metallic oxides in the crystallizer during continuous casting, which are carried by various reasons. When entering the molten steel, part of it is captured by the growing solidified slab shell, that is, the phenomenon of slag entrainment occurs, forming surface (subcutaneous) slag inclusion defects. The surface (subcutaneous) slag inclusion defect macroscopically reduces the surface and internal quality of the steel, causing the subsequent deep processing scrap rate to seriously exceed the standard, and at...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 秦教武张洪战陈永艳赵博张福
Owner XIXIA LONGCHENG METALLURGICAL MATERIALS CO LTD
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