Continuous casting crystallizer covering slag for high-carbon steel

A continuous casting crystallizer and high-carbon steel technology, which is applied in the field of steelmaking-continuous casting, can solve problems such as easy deterioration billet shell and crystallizer lubrication, low melting temperature and viscosity, billet shell bonding breakout, etc., to reduce Cracks, low viscosity, and the effect of ensuring slag consumption

Inactive Publication Date: 2013-07-31
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Otherwise, it is very easy to cause leakage accidents in the continuous casting production process
[0004] The conventional flux used in continuous casting mold flux is Na 2 O and CaF 2 , high carbon steel mold flux requires lower melting temperature and viscosity, if only Na 2 O and Ca

Method used

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  • Continuous casting crystallizer covering slag for high-carbon steel
  • Continuous casting crystallizer covering slag for high-carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0023] Example 1:

[0024] The mass percentage of the chemical composition of the U71Mn steel produced is: C0.72%, Si0.30%, Mn1.14%, P0.013%, S0.013%, and the rest is Fe and unavoidable residual impurities. The casting section size is 280mm×380mm high carbon steel billet, and the drawing speed is controlled at 0.60~0.75m / min.

[0025] The mass percentage of the composition of the mold powder for continuous casting of high carbon steel in this embodiment is: SiO 2 35.5%, CaO26.6%, MgO4.35%, A1 2 O 3 4.981%, Fe 2 O 3 2.28%, Na 2 O10.8%, F5.2%, C6.8%, K 2 O1.45%, Li 2 O0.85%, the rest is water and unavoidable impurities. The melting temperature (hemispheric point) of the mold flux is 980°C, the solidification temperature is 856°C, the viscosity is 0.218 Pa.S at 1300°C, and the alkalinity R is 0.75. During the production, the mold powder and molten slag were sampled and tested. The entire casting process is stable, no bond breakout occurs, the quality of the cast billet is good, and ...

Example Embodiment

[0028] Example 2:

[0029] The mass percentage of the chemical composition of the U75V steel produced is: C0.74%, Si0.76%, Mn0.82%, P0.013%, S0.027%, and the rest is Fe and inevitable residual impurities. The casting section size is 280mm×380mm high carbon steel billet, and the drawing speed is controlled at 0.6~0.75m / min.

[0030] The mass percentage of the composition of the mold powder for continuous casting of high carbon steel in this embodiment is: SiO 2 36.3%, CaO25.9%, MgO4.56%, A1 2 O 3 5.02%, Fe 2 O 3 2.45%, Na 2 O10.75%, F5.8%, C6.88%, K 2 O1.56%, Li 2 O0.645%, the rest is water and unavoidable impurities. The melting temperature (hemispheric point) of the mold powder is 976°C, the solidification temperature is 860°C, the viscosity is 0.24 Pa.S at 1300°C, and the alkalinity R is 0.71. The entire casting process is stable, no bond breakout occurs, the quality of the cast billet is good, and there is no surface longitudinal cracks and dent defects.

Example Embodiment

[0031] Example 3:

[0032] The mass percentage of chemical composition of U75VG steel produced is: C0.72%, Si0.65%, Mn0.85%, P0.014%, S0.013%, the rest is Fe and unavoidable residual impurities. The casting section size is 280mm×380mm high carbon steel billet, and the drawing speed is controlled at 0.6~0.7m / min.

[0033] The mass percentage of the composition of the mold powder for continuous casting of high carbon steel in this embodiment is: SiO 2 36.1%, CaO26.1%, MgO4.86%, A1 2 O 3 4.98%, Fe 2 O 3 2.53%, Na 2 O10.85%, F5.35%, C6.5%, K 2 O1.61%, Li 2 O0.72%, the rest is water and unavoidable impurities. The melting temperature (hemispheric point) of the mold flux is 978°C, the solidification temperature is 862°C, the viscosity is 0.23 Pa.S at 1300°C, and the alkalinity R is 0.72. The entire casting process is stable, no bond breakout occurs, the quality of the cast billet is good, and there is no surface longitudinal cracks and dent defects.

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Abstract

The invention relates to a continuous casting crystallizer covering slag for high-carbon steel. The continuous casting crystallizer covering slag comprises the following components in percentages by weight: 22.90-37.0% of SiO2, 22.5-27.0% of CaO, 4.35-5.0% of MgO, 1.8-6.0% of Al2O3, 2.2-3.0% of Fe2O3, 9.0-12.0% of Na2O, 5.2-6.0% of F, 6.5-9.0% of C, not more than 2.0% of K2O, not more than 1.9% of Li2O, and the balance of water and impurities. According to the continuous casting crystallizer covering slag for high-carbon steel disclosed by the invention, the using amounts of Na2O and CaF2 are properly reduced, K2O and Li2O fluxing is added, and the slag not only has proper physicochemical performance but also has good glass property and lubricating property, so that the quality and yield of casting blanks are greatly improved, and the covering slag has high economic benefit and social benefit.

Description

technical field [0001] The invention relates to the technical field of steelmaking-continuous casting, in particular to a mold slag for continuous casting molds for high-carbon steel. 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] Compared with other steel types, high-carbon steel has the following characteristics: 1) The zero-strength temperature is lower, slightly exceeding 1300°C, and the t...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 王爱兰
Owner INNER MONGOLIA BAOTOU STEEL UNION
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