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Function protecting material of continuous casting crystallizer for large square low-carbon steel

A continuous casting crystallizer and protective material technology, applied in the field of metallurgical auxiliary materials, can solve problems such as cohesive breakout, longitudinal crack depression, slag inclusion and sticky slag

Active Publication Date: 2010-06-23
HENAN XIBAO METALLURGICAL MATERIALS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a low-carbon steel bloom low-carbon steel continuous casting crystallizer functional protection material which solves the problems of longitudinal crack depression on the surface of the low-carbon steel bloom, cohesive breakout during casting, slag inclusion and sticky slag on the surface of the slab

Method used

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Embodiment 1

[0014] The invention discloses a functional protective material for continuous casting molds of low carbon steel blooms, the raw materials of which include the following components: molten material, barium carbonate, sodium carbonate, fluorite, wollastonite, graphite carbon, fused magnesia, carbon Black, bentonite, its weight percent content is respectively 46%, 5.0%, 7.0%, 4.0%, 18.0%, 10.0%, 4.0%, 4.0%, 2.0%.

[0015] The weight percentage of BaO in the functional protective material is 2.1%, the weight percentage of MgO is 5.7%, and the binary basicity (CaO / SiO 2 Weight ratio) is 1.02, the rest is SiO 2 , CaO, Al 2 o 3 、Na 2 O, F - , whose weight percentage is SiO 2 21.9%, CaO 22.3%, Al 2 o 3 5.0%, Na 2 O 6.3%, F- 3.8%, K 2 O 0.2%.

Embodiment 2

[0017] The invention discloses a functional protective material for continuous casting molds of low carbon steel blooms, the raw materials of which include the following components: molten material, barium carbonate, sodium carbonate, fluorite, wollastonite, graphite carbon, fused magnesia, carbon Black, bentonite, its weight percent content is respectively 46%, 5.0%, 7.0%, 4.0%, 18.0%, 10.0%, 4.0%, 4.0%, 2.0%.

[0018] In the functional protective material, BaO weight percentage is 2.8%, MgO weight percentage is 3.5%, binary basicity (CaO / SiO 2 Weight ratio) is 1.07, the rest is SiO 2 , CaO, Al 2 o 3 、Na 2 O, F - , whose weight percentage is SiO 2 28.0%, CaO 30.0%, Al 2 o 3 6%, Na 2 O 6.2%, F - 2.3%, K 2 O 0.4%.

Embodiment 3

[0020] The invention discloses a functional protective material for continuous casting molds of low carbon steel blooms, the raw materials of which include the following components: molten material, barium carbonate, sodium carbonate, fluorite, wollastonite, graphite carbon, fused magnesia, carbon Black, bentonite, its weight percent content is respectively 46%, 5.0%, 7.0%, 4.0%, 18.0%, 10.0%, 4.0%, 4.0%, 2.0%.

[0021] The weight percentage of BaO in the functional protection material is 2.5%, the weight percentage of MgO is 4.5%, and the binary basicity (CaO / SiO 2 Weight ratio) is 1.04, the rest is SiO 2 , CaO, Al 2 o 3 、Na 2 O, F - , whose weight percentage is SiO 2 25%, CaO 26%, Al 2 o 3 5%, Na 2 O 7.5%, F - 3.0%, K 2 O 0.3%.

[0022] The composition and weight percent of the melting material described in the above three kinds of embodiments are SiO 2 28%, CaO 40%, Al 2 o 3 4.0%, R 2 O 9.0%, F - 7%, MgO 5.0%, and the balance is lost on ignition.

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Abstract

The invention discloses a function protecting material of a continuous casting crystallizer for large square low-carbon steel, comprising the following raw materials by weight percentage: 46% of melting stock , 5.0% of barium carbonate, 7.0% of sodium carbonate, 4.0% of fluorite, 18.0% of wollastonite, 10.0% of graphite carbon, 4.0% of fused magnesia, 4.0% of carbon black and 2.0% of bentonite. The melting stock comprises the following components by weight percentage: 28% of SiO2, 40% of CaO, 4.0% of Al2O3, 9.0% of R2O, 7% of F, 5.0% of MgO and the balance of ignition lost. The function protecting material has excellent spreadability, heat preservation and melting property in the crystallizer, the capacity of heat transmission in the crystallizer is stable and uniform, thereby satisfying the requirement of casting speed in the fluctuation range. The invention has the advantages of small slag block of test slag, improvement of unevenly inflow and good lubricity of the function protecting material, thereby avoiding cohesive bleed-out.

Description

technical field [0001] The invention belongs to the technical field of metallurgical auxiliary materials, and in particular relates to a functional protection material for a bloom low-carbon steel continuous casting crystallizer. Background technique [0002] High-quality steel continuous casting In the continuous casting production process, necessary measures must be taken to ensure the quality of the product, mainly using new technologies such as electromagnetic stirring and soft pressing at the end of solidification. Due to the large area reduction rate of the bloom during the rolling process, the central defect can be dispersed and the carbon segregation can be further reduced. Therefore, most steel mills tend to produce high-quality special steel with blooms with a cross-section exceeding 300mm. Due to the increase in the types of alloys added to high-quality special steel, there are many types of inclusions in molten steel and their contents are high. Therefore, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 李书成李伟峰李保军
Owner HENAN XIBAO METALLURGICAL MATERIALS GROUP
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