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Continuous casting crystallizer protective dregs for carburizing steel and manufacturing method thereof

A continuous casting mold and mold slag technology, which is applied in the field of steelmaking and continuous casting, can solve the problems of difficult control of heat transfer, difficulty in crystallization of mold slag, etc., so as to reduce the generation of rare earth oxides, weak reaction, and heat transfer. uniform effect

Active Publication Date: 2012-12-12
JIANGSU BINXIN STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the alkalinity is too low, it will be difficult to crystallize the mold slag, and it is not easy to control the heat transfer

Method used

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Examples

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Embodiment Construction

[0017] A mold slag for continuous casting molds for carburizing steel, which is obtained by crushing, mixing, pulping and granulating the following raw materials: premelt, modified fly ash, barite, industrial soda ash, waste aluminum powder, Lapis lazuli, lithium carbonate, charcoal, the composition of the mold flux contains by weight percentage: SiO 2 32.3~37.8%, CaO 31.0~40.0%, Al 2 o 3 3.0~6.0%, Li 2 O5.5~7.5%, Na 2 O 10.5~18.5%, TC 4.5~6.5%, BaSO4 5.0~6.8%, SrSO4 4.0~5.8%, the rest is K 2 O≤2%, MnO≤1% and other trace components; binary alkalinity CaO / SiO in the mold flux 2 The physical and chemical performance parameters of mold flux are controlled between 1.07 and 1.25: the melting temperature of the hemispherical point is 1100 to 1350 ° C, the viscosity at 1250 ° C is 0.18 to 0.28 Pa s, the crystallization temperature is 850 to 1000 ° C, the solidification temperature The temperature is 930~1000℃; among them, the modified fly ash in the raw material is prepared by...

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Abstract

The invention discloses continuous casting crystallizer protective dregs for carburizing steel. The continuous casting crystallizer protective dregs are prepared by crushing, mixing, pulping and pelleting the following raw materials: premelting materials, coal ash, barite, industrial sodium carbonate, waste aluminium powder, celestite, lithium carbonate and charcoal. The continuous casting crystallizer protective dregs comprise the following components by weight: 32.2-37.8% of SiO2, 31.0-40.0% of CaO3, 3.0-6.0% of Al2O3, 5.5-7.5% of Li2O, 10.5-18.5% of Na2O, 4.5-6.5% of TC, 5.0-6.8% of BaSO4, 4.0-5.8% of SrSO4 and the balance of less than or equal to 2% of K2O, less than or equal to 1% of MnO and other micro components; and the parameters of the physical and chemical properties of the continuous casting crystallizer protective dregs are as follows: hemisphere-point melting temperature is 1100-1350 DEG C, and the viscosity below 124 DEG C is 0.18-0.28Pa.s. The continuous casting crystallizer protective dregs provided by the invention can be uniformly melted in a crystallizer and have good lubrication on a casting blank; and heat transmission between the crystallizer and a casting blank is uniform and proper.

Description

technical field [0001] The invention relates to a mold powder for continuous casting of molten steel, in particular to a mold powder for continuous casting of mold steel and a preparation method thereof, belonging to the technical field of steelmaking and continuous casting. technical background [0002] Since die steel contains crack-sensitive elements such as Cu, Ti, Cr, and Ni, defects such as cracks and slag pits are prone to occur on the surface of the slab during continuous casting. In the continuous casting process, the use of mold powder in the mold is an indispensable means to control the surface quality of the continuous casting slab and ensure the smooth operation of the continuous casting. The main functions of the mold powder are as follows: 1. Lubricate between the mold and the slab; 2. Absorb the inclusions floating up from the molten steel; 3. Prevent the secondary oxidation of the molten steel and play the role of heat preservation; 4. Control the heat tran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 鲁方志
Owner JIANGSU BINXIN STEEL GRP
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