Function protective material of extra-large round billet peritectic steel continuous casting crystallizer

A technology for continuous casting mold and protective material, applied in the field of metallurgical auxiliary materials, can solve the problems of reducing the heat transfer rate of the solidified shell to the mold, uneven temperature gradient distribution, uneven thermal stress distribution, etc., to promote the technical progress of the industry , Solve surface defects, improve the effect of product lubrication

Active Publication Date: 2015-05-20
HENAN XIBAO METALLURGICAL MATERIALS GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Since C: 0.08-0.15% in 12CrMoV and 15CrMoG steels belongs to the peritectic range steel, during the solidification process, due to the δ+L→γ phase transformation, the peritectic reaction occurs, and the volume shrinks by 0.38%. Air gaps are created between them, reducing the heat transfer rate from the solidified shell to the crystallizer
The generation of air gap in the crystallizer is non-uniform, resulting in uneven heat transfer from the shell to the mold and uneven temperature gradient distribution in the solidified shell, which makes the thickness of the shell and the thermal stress distribution inside the shell uneven

Method used

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  • Function protective material of extra-large round billet peritectic steel continuous casting crystallizer
  • Function protective material of extra-large round billet peritectic steel continuous casting crystallizer

Examples

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Effect test

Embodiment 1

[0012] Example 1: A functional protection material for a peritectic steel continuous casting crystallizer of an extra large round billet, which is composed of the following components, each component and its component content are calculated by mass percentage: premelt: 55 parts, calcite: 3 parts, sodium carbonate: 2 parts, fluorite: 12 parts, high alumina: 2 parts, cryolite: 3 parts, lithium carbonate: 2 parts, carbon black: 1.8 parts, graphite carbon: 6 parts.

[0013] Further, the active ingredient percentage of the protective material is SiO 2 : 23.3%, CaO: 28.3%, Li 2 O: 1.0%, Al 2 o 3 : 10.5%, K 2 O+Na 2 O: 2.5%, F - : 0.93%, MgO: 0.65%, Fe 2 o 3 : 1.8%.

[0014] The premelt composition includes: SiO 2 : 34.0%, CaO: 34.0%, Al 2 o 3 : 2.0%, R 2 O: 10.0%, F - : 7.0% and other trace elements.

Embodiment 2

[0015] Example 2: A functional protection material for a peritectic steel continuous casting crystallizer of an extra large round billet, which is composed of the following components, each component and its component content are calculated by mass percentage: premelt: 60 parts, calcite: 7 parts, sodium carbonate: 4 parts, fluorite: 18 parts, high alumina: 4 parts, cryolite: 5 parts, lithium carbonate: 3 parts, carbon black: 2.5 parts, graphite carbon: 10 parts.

[0016] Further, the active ingredient percentage of the protective material is SiO 2 : 28.9%, CaO: 34.2%, Li 2 O: 1.9%, Al 2 o 3 : 13.0%, K 2 O+Na 2 O: 6.2%, F - : 3.4%, MgO: 1.23%, Fe 2 o 3 : 2.6%.

[0017] The premelt composition includes: SiO 2 : 38.0%, CaO: 44.0%, Al 2 o 3 : 4.0%, R 2 O: 13.0%, F - : 8.5% and other trace elements.

Embodiment 3

[0018] Example 3: A functional protection material for a peritectic steel continuous casting crystallizer of an extra large round billet, which is composed of the following components, each component and its component content are calculated by mass percentage: premelt: 56 parts, calcite: 3.5 parts, sodium carbonate: 2.5 parts, fluorite: 13 parts, high alumina: 2.8 parts, cryolite: 3.4 parts, lithium carbonate: 2.2 parts, carbon black: 2.0 parts, graphite carbon: 7 parts.

[0019] Further, the active ingredient percentage of the protective material is SiO 2 : 25.2%, CaO: 30.2%, Li 2 O: 1.2%, Al 2 o 3 : 11.5%, K 2 O+Na 2 O: 3.5%, F - : 1.2%, MgO: 0.95%, Fe 2 o 3 : 2.3%.

[0020] The premelt composition includes: SiO 2 : 36.0%, CaO: 38.0%, Al 2 o 3 : 3.0%, R 2 O: 11.0%, F - : 7.5% and other trace elements.

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Abstract

The invention provides a function protective material of an extra-large round billet peritectic steel continuous casting crystallizer. The function protective material comprises the following components in percentage by weight: 55-60 parts of premelting material, 3-7 parts of calcite, 2-4 parts of sodium carbonate, 12-18 parts of fluorite, 2-4 parts of high alumina, 3-5 parts of cryolite, 2-3 parts of lithium carbonate, 1.8-2.5 parts of carbon black and 6-10 parts of graphite carbon. The function protective material not only is uniform in melting in the crystallizer and less in slag rim, but also the liquid slag has the thickness of 8-10mm in normal pull speed; the steel consumption amount of each ton is 0.1-0.35Kg; longitudinal pits and cracks are not generated in the weak pats of a billet shell, and the non-cleaned rate of the surface of a casting blank reaches above 98%.

Description

technical field [0001] The invention relates to the technical field of metallurgical auxiliary materials, in particular to a functional protection material for a peritectic steel continuous casting crystallizer of an extra large round billet. Background technique [0002] The high-end energy equipment manufacturing industry is one of the strategic emerging industries that my country will focus on during the "Twelfth Five-Year Plan" period, and the research on related key materials plays a vital role in promoting the development of this industry. [0003] 12CrMoV, 15CrMoG and other alloy heat-resistant seamless steel pipes in energy equipment materials have much higher performance than ordinary seamless steel pipes, because this kind of steel pipe contains more Cr and Mo alloy elements, and it is resistant to high temperature, low temperature and corrosion. The performance of other seamless steel pipes is not comparable, so alloy pipes are widely used in petroleum, chemical, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 李伟锋李书成张鹏李保军
Owner HENAN XIBAO METALLURGICAL MATERIALS GROUP
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