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Continuous casting mold fluxes for medium-high carbon steel and alloy steel

A continuous casting mold flux, medium and high carbon technology, applied in the field of continuous casting mold flux, can solve the problems of slow solidification, low liquidus temperature, easy to produce surface cracks, etc., and achieve the effect of moderate viscosity bulk density and low bulk density

Inactive Publication Date: 2012-05-23
GUANGZHOU PEARL RIVER STEEL & IRON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The steel grades in the middle and high carbon range are characterized by slow solidification speed; poor thermal strength, high crack sensitivity, and easy surface cracks; low liquidus temperature of steel grades, low pouring temperature and pouring speed; at the same time, due to the initial shell solidification Small shrinkage is easy to produce bonded breakout

Method used

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  • Continuous casting mold fluxes for medium-high carbon steel and alloy steel
  • Continuous casting mold fluxes for medium-high carbon steel and alloy steel
  • Continuous casting mold fluxes for medium-high carbon steel and alloy steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This example specifically illustrates the situation of using the invented continuous casting mold flux to produce high carbon alloy tool steel SKS51. The chemical composition of SKS51 produced in this embodiment (by weight, %): C 0.81, Si 0.20, Mn 0.30, P 0.15, S 0.005, Cr: 0.30, Ni: 1.5, and the rest are Fe and unavoidable residual impurities.

[0027] The mold powder composition (by weight, %) described in this embodiment is: SiO 2 30.0, CaO 29.0, MgO 4.0, Al 2 o 3 4. Fe 2 o 3 0, MnO 2 1.0, Na 2O 12.0, F9.5, C 9.8, the rest is water and / or unavoidable impurities. The physical and chemical performance indicators of the mold flux are as follows: basicity 0.97, viscosity 1.05 (1300°C) poise, melting temperature 1015°C, and bulk density 0.7Kg / L.

[0028] The entire pouring process is stable, and no bonded steel breakout occurs; the casting speed is stably controlled at 4.0-4.5m / min; The time-sharing pouring curve of the internal behavior of the crystallizer in ...

Embodiment 2

[0031] This example illustrates the production of high carbon alloy tool steel 8CrV2 using the invented continuous casting mold flux. The chemical composition (by weight, %) of described 8CrV2 molten steel: C 0.84, Si 0.38, Mn 0.55, P 0.020, S 0.005, Cr 0.50, V 0.18, and the rest are Fe and unavoidable impurities.

[0032] The mold powder composition (by weight, %) described in this embodiment is: SiO 2 29.0, CaO 24.0, MgO 6.0, Al 2 o 3 4.5, Fe 2 o 3 1.2, MnO 2 0.5, Na 2 O 13.0, F 12, C 7.1, LiO 2 0.8, the rest is water and / or unavoidable impurities. The physical and chemical performance indicators of the mold flux are as follows: basicity 0.83, viscosity 0.95 (1300°C) poise, melting temperature 968°C, and bulk density 0.65Kg / L.

[0033] The entire pouring process is stable, and no bonded steel breakout occurs; the casting speed is stably controlled at 4.0-4.3m / min; The time-sharing pouring curve of the internal behavior of the crystallizer in the continuous cast...

Embodiment 3

[0036] This example specifically illustrates the situation of using the invented continuous casting mold flux to produce alloy structural steel 30CrMo. The chemical composition of the 30CrMo produced (by weight, %): C 0.26, Si 0.30, Mn 0.60, P 0.015, S 0.003, Cr 0.950, Mo 0.19, and the rest are Fe and unavoidable residual impurities.

[0037] The mold powder composition (by weight, %) described in this embodiment is: SiO 2 24.0, CaO 24.5, MgO 6.0, Al 2 o 3 4.5, Fe 2 o 3 1.3, MnO 2 1.0, Na 2 O 13.0, F 12, C 9.5, K 2 O 1.5, the rest is water and / or unavoidable impurities. The physical and chemical performance indicators of the mold flux are as follows: basicity 1.02, viscosity 0.90 (1300°C) poise, melting temperature 958°C, and bulk density 0.6Kg / L.

[0038] The entire pouring process is stable, and no bonded steel breakout occurs; the casting speed is stably controlled at 4.0-4.3m / min; The time-sharing pouring curve of the internal behavior of the crystallizer in t...

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Abstract

The invention provides continuous casting mold fluxes specific for production of medium-high carbon steel and alloy steel. The mold fluxes are applicable to the production of the medium-high carbon steel and the alloy steel with a carbon content ranging from 0.26 to 1.0 weight percent by a thin slab continuous casting machine. The mold fluxes mainly comprise the following components in weight percentage: 23.0 to 31.0 percent of SiO2, 22.0 to 29.0 percent of CaO, 4.0 to 6.0 percent of MgO, 2.5 to 4.5 percent of Al2O3, less than or equal to 1.3 percent of Fe2O3, less than or equal to 1.0 percent of MnO2, 10.0 to 13.0 percent of Na2O, 8.7 to 12.0 percent of F and 7.0 to 10.0 percent of C. The mold fluxes of the invention have relatively low crystallization and softening temperatures, so when the medium-high carbon steel and the alloy steel with a relatively low liquidus temperature are poured, the lubrication of a non-Newtonian fluid and the probability of surface cracking caused by the inhomogeneous heat dissipation of a casting slab due to the crystallization are greatly reduced in a relatively low crystallization and softening temperature range.

Description

technical field [0001] The invention belongs to the technical field of continuous casting mold slag, and in particular relates to a continuous casting mold slag for producing medium-high carbon carbon steel and alloy steel by a thin slab continuous casting and rolling process. Background technique [0002] Continuous casting mold flux is one of the most important auxiliary materials for continuous casting of molten steel. With the improvement of continuous casting ratio at home and abroad, its continuous casting mold flux has tended to be standardized in the industry. Usually mold flux contains CaO, SiO 2 、Al 2 o 3 Mineral raw materials such as oxides, among which CaO, SiO 2 About 55-80%, CaO / SiO is between 0.5-1.5, Al 2 o 3 It accounts for between 2 and 15%; add flux containing Na, F and other elements to adjust the melting point and viscosity of mold flux, Na 2 O+F accounts for 5-20% of the total amount of mold slag; continuous casting mold slag must be mixed with a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 李亚平王进步苏东高吉祥
Owner GUANGZHOU PEARL RIVER STEEL & IRON
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