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Continuous casting crystallizer protective scoria for weathering steel and manufacturing method thereof

A technology for continuous casting mold and mold slag, which is applied in the field of mold slag for continuous casting of weathering steel and its preparation, and in the field of mold slag for continuous casting of molten steel, which can solve the problem of difficult heat transfer and crystallization of mold slag Difficulties and other problems, to achieve the effect of reducing the formation of rare earth oxides, weak reaction, and improving the surface quality of the slab

Inactive Publication Date: 2008-02-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the alkalinity is too low, it will be difficult to crystallize the mold slag, and it is not easy to control the heat transfer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Weigh the required raw materials according to the ratio shown in Table 1, and use the spray granulation process to make hollow particle mold powder. The chemical composition (percentage by weight) of the obtained mold flux is: SiO 2 32.7%, CaO 33.6%, Al 2 o 3 4.1%, MgO 4.2%, Li 2 O2.5%, Na 2 O 7.3%, F 6.1%, TC 5.5%, Fe 2 o 3 0.7%, the rest is K 2 O 1.5%, MnO 0.9% and other trace components, among which CaO / SiO 2 : 1.03, its physical properties are: hemispherical point melting temperature 1121°C, viscosity at 1300°C 0.18Pa·s, crystallization temperature 932°C, solidification temperature 955°C. The mold flux is used in casting 09CuPTiRE-A and 09CuPTiRE-B. The experimental conditions are: billet section 200mm×1050mm, casting speed 0.9m / min, pouring temperature 1560°C, good spreadability and fluidity in the crystallizer, The slag surface is active, the reaction with the rare earth wire is weak, there is no agglomeration, agglomeration and other poor melting phenome...

Embodiment 2

[0043] Weigh the required raw materials according to the ratio shown in Table 1, and use the spray granulation process to make hollow particle mold powder. The chemical composition (percentage by weight) of the obtained mold flux is: SiO 2 33.8%, CaO 33.6%, Al 2 o 3 4.1%, MgO 4.3%, Li 2 O 2.3%, Na 2 O 6.8%, F 5.9%, TC 6.1%, Fe 2 o 3 0.8%, the rest is K 2 O 1.1%, MnO 0.5% and other trace components, among which CaO / SiO 2 : 0.99. Its physical properties are: hemispherical point melting temperature 1112°C, viscosity at 1300°C 0.20Pa·s, crystallization temperature 932°C, solidification temperature 953°C. The mold flux is used in casting 09CuPTiRE-A and 09CuPCrNi-A. The experimental conditions are: billet section 200mm×1060mm, casting speed 0.85m / min, pouring temperature 1555°C, good spreadability and fluidity in the crystallizer, The slag surface is active, the reaction with the rare earth wire is weak, there is no agglomeration, agglomeration and other poor melting phe...

Embodiment 3

[0045] Weigh the required raw materials according to the ratio shown in Table 1, and use the spray granulation process to make hollow particle mold powder. The chemical composition (percentage by weight) of the obtained mold flux is: SiO 2 34.3%, CaO 33.7%, Al 2 o 3 4.5%, MgO 3.6%, Li 2 O 2.3%, Na 2 O 7.4%, F 6.6%, TC 5.1%, Fe 2 o 3 0.6%, the rest is K 2 O 0.8%, MnO 0.3% and other trace components, among which CaO / SiO 2 : 0.98. Its physical properties are: hemispherical point melting temperature 1135°C, viscosity at 1300°C 0.19Pa·s, crystallization temperature 913°C, solidification temperature 942°C. The mold flux is used in 09CuPRE and 09CuPCrNi-A pouring. The experimental conditions are: billet section 200mm×1250mm, casting speed 0.82m / min, pouring temperature 1565°C, good spreadability and fluidity in the mold, slag surface Active, weak reaction with rare earth wire, no agglomeration, agglomeration and other poor melting phenomena on the slag surface, no slag st...

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Abstract

The present invention relates to a continuous casting mold protecting powder and the manufacturing method of the mold protecting powder for a weathering steel. Adopting the making art of spraying particle, the mold protecting powder is made from the materials such as premelting material, quartz sand, fluorite, industrial calcined soda, magnesite, medium supper soot carbon, graphite, lithium carbonate and so on, chemical ingredients of the mold protection powder in weight percentage are as follows: SiO2 30.0 to 37.0 percent, CaO 30.0 to 37.0 percent, Al2O3 2.0 to 5.0 percent, MgO 3.0 to 6.0 percent, Li2O 1.5 to 2.5 percent, Na2O 5.5 to 8.5 percent, F 4.5 to 7.5 percent, TC(totally carbon) 4.5 to 6.5 percent, 0< Fe2O3 less than or eqal to 1.0%, binary alkalinity CaO / SiO2 is 0.95 to 1.05. The mold protecting powder regarding the invention melts evenly inside the mold and has weak reaction with the rare earth wire, excellent lubricating performance to the casting blank, even and proper heat transmission between the continuous casting mold and the casting blank, therefore reducing the ingot bleeding rate and the occurance rate of surface vertical flaws.

Description

Technical field: [0001] The invention relates to a mold powder for continuous casting of molten steel, in particular to a mold powder for continuous casting of weathering steel and a preparation method thereof, belonging to the technical field of steelmaking and continuous casting. technical background: [0002] Weathering steel (including 09CuPRE, 09CuPTiRE, 09CuPCrNi and other steel types) contains crack-sensitive elements such as Cu, Ti, Cr and Ni, and defects such as cracks and slag pits are prone to occur on the surface of the slab during continuous casting. In the continuous casting process, the use of mold powder in the mold is an indispensable means to control the surface quality of the continuous casting slab and ensure the smooth operation of the continuous casting. The main functions of the mold powder are as follows: 1. Lubricate between the mold and the slab; 2. Absorb the inclusions floating up from the molten steel; 3. Prevent the secondary oxidation of the mo...

Claims

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Application Information

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IPC IPC(8): B22D11/111
Inventor 陈天明杨素波段大福曾建华张均祥
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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