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Function protection material for special continuous casting crystallizer of high-pressure boiler tube steel

A continuous casting crystallizer and protective material technology, applied in the field of metallurgical auxiliary materials, can solve the problems of reduced consumption of continuous casting functional protective materials, cohesive breakouts, insufficient lubrication, etc.

Active Publication Date: 2013-06-12
HENAN XIBAO METALLURGICAL MATERIALS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the realization of high-speed continuous casting technology has brought many new problems to the continuous casting process. For example, as the casting speed increases, the relative consumption of continuous casting functional protective materials decreases; the lubrication between the mold wall and the solidified billet shell Insufficient and uneven heat transfer; which in turn leads to surface defects of the slab, and even cohesive breakouts, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] A special continuous casting crystallizer functional protection material for high-pressure boiler tube steel. The raw material of the functional protection material includes the following components: carbon black, graphite, bauxite, fluorite, lithium carbonate, white alkali, calcite, clinker, silica fume Stone, its weight percent content is respectively 2%, 5.5%, 3%, 8%, 1.5%, 5%, 5%, 7%, 63%.

[0017] Li in the functional protection material 2 O weight percentage content is 0.22%, MgO weight percentage content is 2.7%, Fe 2 o 3 The weight percentage is 0.6%, the binary alkalinity (CaO / SiO 2 Mass ratio) is 1.2, the rest is SiO 2 , CaO, Al 2 o 3 、Na 2 O, F - , whose weight percentage is SiO 2 33%, CaO 39.6%, Al 2o 3 4.3%, Na 2 O 4.2%, F - 4%, K 2 O 0.4%.

Embodiment 2

[0019] A special continuous casting crystallizer functional protection material for high-pressure boiler tube steel. The raw material of the functional protection material includes the following components: carbon black, graphite, bauxite, fluorite, lithium carbonate, white alkali, calcite, clinker, silica fume Stone, its weight percent content is respectively 2%, 5.5%, 3%, 8%, 1.5%, 5%, 5%, 7%, 63%.

[0020] Li in the functional protection material 2 O weight percentage content is 0.34%, MgO weight percentage content is 1.3%, Fe 2 o 3 The weight percentage is 1.3%, the binary alkalinity (CaO / SiO 2 Mass ratio) is 1.14, the rest is SiO 2 , CaO, Al 2 o 3 、Na 2 O, F - , whose weight percentage is SiO 2 35.5%, CaO 40.4%, Al 2 o 3 2.7%, Na 2 O 2.9%, F - 4.2%, K 2 O 0.12%.

Embodiment 3

[0022] A special continuous casting crystallizer functional protection material for high-pressure boiler tube steel. The raw material of the functional protection material includes the following components: carbon black, graphite, bauxite, fluorite, lithium carbonate, white alkali, calcite, clinker, silica fume Stone, its weight percent content is respectively 2%, 5.5%, 3%, 8%, 1.5%, 5%, 5%, 7%, 63%.

[0023] Li in the functional protection material 2 O weight percentage content is 0.3%, MgO weight percentage content is 2.0%, Fe 2 o 3 The weight percentage is 1%, the binary alkalinity (CaO / SiO 2 Mass ratio) is 1.17, the rest is SiO 2 , CaO, Al 2 o 3 、Na 2 O, F, its weight percentage is SiO 2 34.5%, CaO 40.3%, Al 2 o 3 3.5%, Na 2 O 3.5%, F - 3.5%, K 2 O 0.25%.

[0024] Above-mentioned white alkali, clinker are metallurgy materials commonly used by those skilled in the art, wherein the composition of white alkali is industrial purity Na 2 CO 3 , The composition...

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Abstract

The invention discloses a function protection material for a special continuous casting crystallizer of high-pressure boiler tube steel. The raw materials of the function protection material comprise the following components in mass percent: 2% of carbon black, 5.5% of graphite, 3% of alumina, 8% of fluorite, 4.0% of lithium carbonate, 1.5% of white alkali, 5% of calcite, 7% of grog and 63% of wollastonite. The function protection material contains the following conventional components: SiO2, CaO, MgO and Al2O3, and does not contain Na2O and F- compared with a conventional premelting material, thereby effectively controlling contents of Na2O and F- in slag, avoiding damage of the glass property of a slag film, ensuring lubrication between a casting blank and the crystallizer, improving stability of the slag performance, and obviously increasing stability of the using effect.

Description

technical field [0001] The invention belongs to the technical field of metallurgical auxiliary materials, and in particular relates to a special continuous casting crystallizer functional protection material for high-pressure boiler tube steel. Background technique [0002] In recent years, with the development of modern industry, high-pressure boiler tube steel has broad development prospects. According to the characteristics of corrosion resistance and high compressive strength of this steel grade, combined with the development of continuous casting technology today, a special continuous casting crystallizer functional protection material for high pressure boiler tubes has been developed. [0003] In recent years, iron and steel enterprises inside and outside the surrounding area have generally adopted high-efficiency continuous casting technology to speed up the pace of steelmaking and increase the amount of steel tapped from the furnace to improve production efficiency. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 李书成李伟峰王小梅
Owner HENAN XIBAO METALLURGICAL MATERIALS GROUP
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