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Continuous casting crystallizer protective material special for large round billet high-abrasion bearing steel

A continuous casting crystallizer and protective material technology, applied in the field of metallurgical auxiliary materials, can solve problems such as unfavorable steel quality and optimization

Active Publication Date: 2012-07-04
HENAN XIBAO METALLURGICAL MATERIALS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the continuous casting mold protection materials for smelting various bearing steels have not been developed and matched stably, especially the mold protection materials for heavy bearing steel such as large round billet high wear-resistant bearing steel. Other steel protection material substitution status is not conducive to the further optimization of the steel quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A special continuous casting mold protection material for large round billet high wear-resistant bearing steel, including premelt material (premelt material composition includes: SiO 2 28.0~33.0%, CaO 21.0~25.0%, Al 2 o 3 6.0~9.0%, R 2 O 3.0~7.0%, F - 2.5~6.0%,), fine glass powder, sodium carbonate, fluorite, sodium fluoride, lithium carbonate, carbon black and recarburizer, the mass percentages are 56.0%, 12.0%, 1.5%, 16.5%, respectively 2.0%, 6.0%, 2.0%, 4.0%.

[0013] Li in the continuous casting mold protection material 2 O weight percentage content is 2.0 ~ 3.0%, binary alkalinity (CaO / SiO 2 ) is 0.6~0.85, the balance includes SiO 2 , CaO, Al 2 o 3 、Na 2 O, F - and C 固 , whose percentage is SiO 2 26.0~33.0%, CaO 21.0~26.0%, Al 2 o 3 7.0~12.0%, Na 2 O 4~7%, F - 3.0~5.0%, C 固 12.5-16.0%.

Embodiment 2

[0015] A special continuous casting mold protection material for large round billet high wear-resistant bearing steel, including premelt material (premelt material composition includes: SiO 2 28.0~33.0%, CaO 21.0~25.0%, Al 2 o 3 6.0~9.0%, R 2 O 3.0~7.0%, F -2.5~6.0%,), fine glass powder, sodium carbonate, fluorite, sodium fluoride, lithium carbonate, carbon black and recarburizer, the mass percentages are 60.0%, 10%, 2%, 15.0%, respectively 3%, 4.0%, 1.5%, 4.5%.

[0016] Li in the continuous casting mold protection material 2 O weight percentage content is 2.0 ~ 3.0%, binary alkalinity (CaO / SiO 2 ) is 0.6~0.85, the balance includes SiO 2 , CaO, Al 2 o 3 、Na 2 O, F - and C 固 , whose percentage is SiO 2 26.0~33.0%, CaO 21.0~26.0%, Al 2 o 3 7.0~12.0%, Na 2 O 4~7%, F - 3.0~5.0%, C 固 12.5-16.0%.

Embodiment 3

[0018] A special continuous casting mold protection material for large round billet high wear-resistant bearing steel, including premelt material (premelt material composition includes: SiO 2 28.0~33.0%, CaO 21.0~25.0%, Al 2 o 3 6.0~9.0%, R 2 O 3.0~7.0%, F - 2.5~6.0%,), fine glass powder, sodium carbonate, fluorite, sodium fluoride, lithium carbonate, carbon black and recarburizer, the mass percentages are 64.0%, 8.0%, 2.5%, 13.5%, respectively 4.0%, 3.0%, 1.0%, 4.0%.

[0019] Li in the continuous casting mold protection material 2 O weight percentage content is 2.0 ~ 3.0%, binary alkalinity (CaO / SiO 2 ) is 0.6~0.85, the balance includes SiO 2 , CaO, Al 2 o 3 、Na 2 O, F - and C 固 , whose percentage is SiO 2 26.0~33.0%, CaO 21.0~26.0%, Al 2 o 3 7.0~12.0%, Na 2 O 4~7%, F - 3.0~5.0%, C 固 12.5-16.0%.

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Abstract

The invention discloses a continuous casting crystallizer protective material special for large round billet high-abrasion bearing steel. The protective material comprises the following components in percentage by mass: 56.0 to 64.0 percent of pre-melt, 8.0 to 12.0 percent of fine glass powder, 1.0 to 3.0 percent of sodium carbonate, 13.0 to 17.0 percent of fluorite, 2.0 to 4.0 percent of sodium fluoride, 2.0 to 6.0 percent of lithium carbonate, 1.0 to 2.5 percent of carbon black and 4.0 to 6.0 percent of re-carburizing agent. The protective material serving as the research result is melted uniformly in a crystallizer, a few slag rings are produced, the thickness of liquid slag at a normal casting speed is 10 to 12 millimeters, the consumption of the protective material for each ton of steel is 0.35 to 0.45Kg, and the cleaning-free rate of the surface of a casting blank reaches over 98 percent; and after the steel is subjected to carburization, thermal treatment, quenching and tempering, the surface hardness of the steel is 58 to 62HRC, the heart hardness of the steel is 25 to 45HRC, the surface of the steel is abrasion-resistant, and the heart of the steel has good toughness.

Description

technical field [0001] The invention relates to a metallurgical auxiliary material, in particular to a special continuous casting crystallizer protection material for large round billets and high wear-resistant bearing steels. Background technique [0002] Modern bearing industry, as one of the most important basic industries, is an important symbol of a country's industrial technology level. Bearings have become the main support type of modern mechanical vehicles, and they are also important and indispensable basic components in modern vehicles. The characteristics that the ring and rolling body materials must have: high contact fatigue strength; high hardness; high purity; good wear resistance; good organizational stability; good machining performance. Therefore, the materials of rolling elements and inner and outer rings are required to have high hardness and contact fatigue strength, good wear resistance and impact toughness. Commonly used bearing materials (rings and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 李书成李伟锋黄占基范李飞
Owner HENAN XIBAO METALLURGICAL MATERIALS GROUP
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