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Low-carbon steel protecting slag for continuous casting of sheet billet and preparing method thereof

A thin slab continuous casting and mold slag technology is applied in the field of mold slag and preparation, low carbon steel mold slag for thin slab continuous casting and its preparation. problems, to achieve the effect of good slab surface quality, good melting uniformity and reasonable heat flux density

Inactive Publication Date: 2007-03-14
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since low-carbon steel solidifies at a higher temperature than medium-carbon steel, when pouring low-carbon steel, the air gap between the copper plate and the billet shell in the lower funnel area of ​​the crystallizer will increase or the slag film will become thicker, making the heat transfer in the central part worse. Poor, shell becomes thinner
In addition, when the casting slab enters the secondary cooling zone, since the funnel shape of the support roll continues to the middle of the sector 0, the central part of the slab will be detached from the support and bear a tensile stress, which makes FTSC thin slab continuous casting When the machine casts medium carbon steel, the probability of cracks in the slab is small, but the tendency of bonding is enhanced, and when casting low carbon steel, the slab is prone to longitudinal cracks
Therefore, the mold flux technology that matches the solidification characteristics is obviously different from that of CSP. Obviously, the low-carbon steel mold flux for FTSC thin slab continuous casting cannot mechanically copy the relatively mature technical indicators of CSP mold flux
The current production status of FTSC thin slab continuous casting machine is: no effective technical solution for mold flux under FTSC process has been found, resulting in many accidents in FTSC casting machine due to mismatching mold flux, and it is difficult to guarantee the surface quality of cast slabs

Method used

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  • Low-carbon steel protecting slag for continuous casting of sheet billet and preparing method thereof
  • Low-carbon steel protecting slag for continuous casting of sheet billet and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Selection of raw materials: waste glass, fluorite, limestone, magnesia, lithium carbonate, quartz sand, super carbon black, high carbon graphite, sodium fluoride, soda ash, sodium carboxymethyl cellulose.

[0025] Above-mentioned raw material chemical composition weight percentage is: SiO 2 28, CaO 29, Al 2 o 3 5, MgO3, Fe 2 o 3 3, F 9, Na 2 O+K 2 O 10, Li 2 O2, C9, CMC2.

[0026] Preparation:

[0027]1. Production of pre-melted materials: crush limestone, waste glass and fluorite among the above raw materials into 0.1-1mm particles, then mix with soda ash and sodium fluoride powdered raw materials, agglomerate, dry, melt in the furnace, and then After condensation and crushing, it is ready for use. When the premelt is out of the furnace, it should be forced to cool by flushing the slag with a large water flow to obtain a premelt in the vitreous phase.

[0028] 2. Production of finished mold powder: Take the above premelt and add carbonaceous material and so...

Embodiment 2

[0030] Selection of raw materials: waste glass, fluorite, limestone, quartz sand, dolomite, magnesia, lithium carbonate, super carbon black, high carbon graphite, soda ash, sodium fluoride powder, cement clinker, sodium wood sulfonate, carboxymethyl Sodium cellulose.

[0031] Above-mentioned raw material chemical composition weight percentage is: SiO 2 31.6, CaO 32.9, Al 2 o 3 4.5, MgO 2.8, Fe 2 o 3 0.7, F7, Na 2 O+K 2 O 9, Li 2 O 1.9, C 8.5, CMC 0.6, sulfonate 0.5.

[0032] Preparation:

[0033] 1. Production of pre-melted materials: crush limestone, quartz sand, waste glass, dolomite, magnesia and fluorite among the above raw materials into 0.1-1mm particles, then mix with soda ash and sodium fluoride powder raw materials to form agglomerates , dried, melted in the furnace, and then condensed and crushed for later use. When the premelt is out of the furnace, the slag is flushed with a large water flow and forced to cool to obtain a premelt in the vitreous phase....

Embodiment 3

[0036] Selection of raw materials: waste glass, fluorite, limestone, magnesia, super carbon black, high carbon graphite, soda ash, cement clinker, sodium carboxymethyl cellulose.

[0037] Above-mentioned raw material chemical composition weight percentage is: SiO 2 32, CaO 33, Al 2 o 3 3, MgO 1, Fe 2 o 3 1.5, F 8.8, Na 2 O+K 2 O 12, C 7, CMC 1.7.

[0038] Preparation:

[0039] 1. Production of pre-melted materials: crush limestone, magnesia, waste glass and fluorite among the above raw materials into 0.1-1mm particles, then mix with soda ash, make agglomerates, dry, melt in the furnace, and then condense and crush Backup. When the premelt is out of the furnace, it should be forced to cool by flushing the slag with a large water flow to obtain a premelt in the vitreous phase.

[0040] 2. Production of finished mold powder: Take the above premelt and add carbonaceous materials, cement clinker, and sodium carboxymethyl cellulose according to the ratio. The carbonaceou...

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Abstract

The invention relates to a method for preparing low-carbon steel protective slag used to casting sheet blank. Wherein, it is characterized in that: the chemical component mass percentages of said protective slag are SiO2 at 28-32, CaO at 29-33, Al2O3 at 3-5, MgO at 1-3, Fe2O3<=3, F at 7-9, Na2O+K2O at 9-12, Li2O<=2.0, C at 7-9, and adhesive at 1-3; said protective slag is alkali one whose alkali R is higher then 1 and R=CaO / SiO2. The invention can realize low crystallize temperature, high solidify temperature and high crystallize ratio, to meet the casting demand of FTSC sheet blank.

Description

technical field [0001] The invention relates to a mold slag and a preparation method thereof, in particular to a low-carbon steel mold slag for thin slab continuous casting and a preparation method thereof, belonging to the technical field of steelmaking and continuous casting. Background technique [0002] The role of mold slag for continuous casting molds can be summarized as the following five points: 1) Prevent the re-oxidation of the molten steel surface by air; 2) Insulate the exposed molten steel; 3) Absorb and dissolve non-metallic inclusions; 4) In the Lubricate between the crystallizer and the billet shell; 5) Control the heat transfer speed and stability. Among the five functions of the above-mentioned mold flux, the lubrication and control of heat transfer between the mold and the billet shell are particularly important. The lubricating effect is determined by the vitrification properties of mold flux, and the control of heat transfer is determined by the crysta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/11C21C7/076
CPCY02P10/20
Inventor 李梦英张洪波孔庆福杨杰白连臣吴振刚石玉良杨晓江佟志新
Owner HEBEI IRON AND STEEL
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