Continuous casting crystallizer protective slag for medium-carbon rare earth steel plate

A continuous casting crystallizer and medium-carbon rare earth technology, applied in the field of steelmaking-continuous casting, can solve the problems of weakening the reactivity of mold slag and molten steel, deteriorating the lubrication of the slab shell, and affecting the smooth running of continuous casting. Improve the lubrication effect and reduce the occurrence of cracks

Pending Publication Date: 2020-11-24
BAOTOU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For rare earth steel continuous casting mold slag, scholars at home and abroad have conducted relevant research. At present, the rare earth steel continuous casting mold slag tends to be mixed with higher Li 2 O.B 2 o 3 , CaF 2 , NaO 2 equal content, by lowering the melting temperature of the mold slag, increasing the crystallization rate of the slag, satisfying the heat transfer and lubrication between the continuous casting slab and the mold wall, but the CaF in the mold slag 2 , NaO 2 If it is too high, it will lead to high crystallization temperature, which will easily deteriorate the lubrication of the billet shell and cause the billet shell to stick to breakout
There is also a certain amount of rare earth oxides added to the mold slag to weaken the reactivity of the mold slag and molten steel, but the addition of high melting point rare earth oxides to the mold slag will increase the melting temperature of the mold slag and promote the precipitation of crystals. The uniformity of mold slag flowing into the casting slab and the mold becomes poor, which affects the continuous casting

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The mass percent of the chemical composition of the carbon rare earth steel plate produced in this embodiment is: C 0.157%, Si0.29%, Mn 1.26%, P 0.0128%, S 0.001%, RE 0.0010%, and the rest is Fe and unavoidable residual impurities. The casting section size is 2000×250mm rare earth steel plate, and the casting speed is controlled at 0.9m / min.

[0019] The composition and mass percentage of the mold powder for the continuous casting mold for the medium-carbon rare earth steel plate used in this embodiment are: SiO 2 25.57%, CaO 31.2%, MgO 2.16%, A1 2 o 3 3.69%, MnO 3.73%, FeO 0.5%, Na 2 O7.91%, F 6.65%, C 14.5%, K 2 O 0.234%, Li 2 O 0.138%, the rest is water and unavoidable impurities. The melting temperature (hemispherical point) of the mold flux is 1138°C, when the viscosity is 1300°C, it is 0.21 Pa.S, the melting speed is 42S, and the basicity R is 1.22. During the production, the mold powder and its molten slag were sampled and tested. The whole casting has ...

Embodiment 2

[0023] The mass percentages of the chemical components of the medium-carbon rare earth steel sheet in this embodiment are: C 0.16%, Si 0.29%, Mn 1.28%, P 0.0135%, S 0.0012%, RE 0.0012%, and the rest is Fe and unavoidable residual Impurities. The casting section size is 2000×250mm rare earth steel plate, and the casting speed is controlled at 0.9m / min.

[0024] The composition and mass percentage of the mold slag used in the continuous casting mold for the rare earth steel plate used in this embodiment are: SiO 2 26.10%, CaO 32.6%, MgO 2.2%, A1 2 o 3 3.31%, MnO 3.78%, FeO 0.35%, Na 2 O7.9%, F 6.9.%, C 15.1%, K 2 O 0.234%, Li 2 O 0.134%, the rest is water and unavoidable impurities. The melting temperature (hemispherical point) of the mold flux is 1140°C, when the viscosity is 1300°C, it is 0.21 Pa.S, the melting speed is 43S, and the basicity R is 1.24. The whole casting has good castability, stable process, good quality of cast slab, and the qualified rate of cast sla...

Embodiment 3

[0028] The mass percentages of chemical components of the rare earth steel plate in this embodiment are: C 0.17%, Si 0.28%, Mn 1.30%, P 0.0132%, S 0.0011%, RE 0.0013%, and the rest is Fe and unavoidable residual impurities. The casting section size is 2000×250mm rare earth steel plate, and the casting speed is controlled at 0.9m / min.

[0029] The composition and mass percentage of the mold slag used in the continuous casting mold for the rare earth steel plate used in this embodiment are: SiO 2 26.0%, CaO 31.8%, MgO 2.16%, A1 2 o 3 3.68%, MnO 3.75%, FeO 0.32%, Na 2 O7.89%, F 7.2%, C 15.0%, K 2 O 0.24%, Li 2 O 0.136%, the rest is water and unavoidable impurities. The melting temperature (hemispherical point) of the mold flux is 1136°C, when the viscosity is 1300°C, it is 0.138 Pa.S, the melting speed is 39S, and the basicity R is 1.22. During the production, the mold powder and its molten slag were sampled and tested. The whole casting has good castability, stable proc...

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PUM

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Abstract

The invention discloses continuous casting crystallizer protective slag for a medium-carbon rare earth steel plate. The protective slag comprises, by mass percentage, 32.0-40.0% of CaO, 25.0-30.0% ofSiO2, 1.0-2.5% of MgO, 2.3-4.5% of Al2O3, 0.1-4.0% of MnO, 0.0-0.6% of Fe2O3, 7.0-12.0% of Na2O, 7.0-12.0% of F, 8.0-16.0% of C, 0-1.0% of K2O, 0-1.0% of Li2O and the balance water and inevitable impurities. The protective slag is high in alkalinity, low in viscosity and low in oxidization performance, has good physical and chemical properties, and can significantly improve the yield of casting blanks.

Description

technical field [0001] The invention belongs to the technical field of steelmaking-continuous casting, and in particular relates to a mold slag for continuous casting molds for medium-carbon rare earth steel plates. Background technique [0002] In the continuous casting production process, the mold powder is one of the most important auxiliary materials in the continuous casting production process. Its physical and chemical properties directly affect the stable production of continuous casting and the quality and output of the slab. Mold flux must have appropriate physical and chemical properties in order to give full play to its five major metallurgical functions: covering heat preservation, preventing secondary oxidation, absorbing inclusions, lubricating between mold and billet, and improving heat transfer between mold and billet. [0003] Carbon steel with a carbon content of 0.15-0.18 (wt%) is a crack-sensitive steel. For crack-sensitive steels, to avoid cracks, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 王爱兰唐建平韩春鹏张晓峰张达先
Owner BAOTOU IRON & STEEL GRP
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