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, good glassiness and lubricity, effect of ensuring slag loss

Inactive Publication Date: 2015-06-03
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 CaF 2 As a flux, the required dose is relatively large. During the use of the mold powder, too much lance spar and nepheline will be precipitated, which will easily deteriorate the lubrication between the billet shell and the crystallizer, causing the billet shell to stick to the breakout

Method used

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

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Effect test

Embodiment 1

[0021] The mass percentage of the chemical composition of the produced U71Mn steel is: C 0.72%, Si 0.30%, Mn 1.14%, P 0.013%, S 0.013%, the rest is Fe and unavoidable residual impurities. The casting section size is 280mm×380mm high carbon steel billet, and the casting speed is controlled at 0.60-0.75m / min.

[0022] The mass percentage of the constituents of the mold flux for continuous casting mold for high carbon steel in this embodiment is: SiO 2 35.5%, CaO 26.6%, MgO 4.35%, A1 2 o 3 4.981%, Fe 2 o 3 2.28%, Na 2 O 10.8%, F 5.2%, C 6.8%, K 2 O 1.45%, Li 2 O 0.85%, the rest is water and unavoidable impurities. The melting temperature (hemispherical 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 basicity R is 0.75. During the production, the mold powder and its molten slag were sampled and tested. The entire casting process is stable, no bonding breakout occurs, the billet quality is good, a...

Embodiment 2

[0026] The mass percentage of the chemical composition of the produced U75V steel is: C 0.74%, Si 0.76%, Mn 0.82%, P 0.013%, S 0.027%, and the rest is Fe and unavoidable residual impurities. The casting section size is 280mm×380mm high carbon steel billet, and the casting speed is controlled at 0.6-0.75m / min.

[0027]The mass percentage of the constituents of the mold flux for continuous casting mold for high carbon steel in this embodiment is: SiO 2 36.3%, CaO 25.9%, MgO 4.56%, A1 2 o 3 5.02%, Fe 2 o 3 2.45%, Na 2 O 10.75%, F 5.8%, C 6.88%, K 2 O 1.56%, Li 2 O 0.645%, the rest is water and unavoidable impurities. The melting temperature (hemispherical point) of the mold flux is 976°C, the solidification temperature is 860°C, the viscosity is 0.24 Pa.S at 1300°C, and the basicity R is 0.71. The entire casting process is stable, no bonding breakout occurs, the quality of the slab is good, and there are no surface longitudinal cracks and sunken defects.

Embodiment 3

[0029] The mass percentage of the chemical composition of the produced U75VG steel is: C 0.72%, Si 0.65%, Mn 0.85%, P 0.014%, S 0.013%, and the rest is Fe and unavoidable residual impurities. The casting section size is 280mm×380mm high carbon steel billet, and the casting speed is controlled at 0.6-0.7m / min.

[0030] The mass percentage of the constituents of the mold flux for continuous casting mold for high carbon steel in this embodiment is: SiO 2 36.1%, CaO 26.1%, MgO 4.86%, A1 2 o 3 4.98%, Fe 2 o 3 2.53%, Na 2 O 10.85%, F 5.35%, C 6.5%, K 2 O 1.61%, Li 2 O 0.72%, the rest is water and unavoidable impurities. The melting temperature (hemispherical 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 basicity R is 0.72. The entire casting process is stable, no bonding breakout occurs, the quality of the slab is good, and there are no surface longitudinal cracks and sunken 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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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 王爱兰
Owner INNER MONGOLIA BAOTOU STEEL UNION
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