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

A continuous casting mold and mold slag technology, applied in the field of steelmaking and continuous casting, can solve the problems of difficult crystallization of mold slag, difficult to control heat transfer, etc., to reduce the generation of rare earth oxides, weak reaction, and uniform melting Effect

Inactive Publication Date: 2009-08-19
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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  • Continuous casting crystallizer protective scoria for weathering steel and manufacturing method thereof

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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 of 09CuPTiRE-A and 09CuPTiRE-B. The experimental conditions are: billet section 200mm×1050mm, casting speed 0.9m / min, pouring temperature 1560℃, good spreadability and fluidity in the crystallizer , the slag surface is active, the reaction with rare earth wire is weak, there is no agglomeration, agglomeration and other poor melting phenom...

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 ph...

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 invention relates to a continuous casting mold mold powder for weathering steel and a manufacturing method thereof. The mold powder is made of materials such as premelt, quartz sand, fluorite, industrial soda ash, magnesia, super carbon black, graphite, lithium carbonate, etc. Made by spray granulation process, its chemical composition contains by weight percentage: SiO2 30.0-37.0%, CaO 30.0-37.0%, Al2O3 2.0-5.0%, MgO3.0-6.0%, Li2O 1.5-2.5%, Na2O 5.5- 8.5%, F 4.5~7.5%, TC (total carbon) 4.5~6.5%, 0<Fe2O3≤1.0%, binary alkalinity CaO / SiO2 is 0.95~1.05. The mold slag melts evenly in the mold, has weak reaction with rare earth wire, and has good lubrication to the slab, and the heat transfer between the mold and the slab is uniform and appropriate, thereby reducing the breakout rate and surface longitudinal cracks and other defects. incidence.

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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Patent Type & Authority Patents(China)
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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