Protective scoria for continuous casting of ultralow carbon steel

A technology for ultra-low carbon steel and mold slag, which is applied in the field of mold slag for continuous casting of ultra-low carbon steel, and can solve the problems of affecting the service life of the long nozzle and the oxidation of the enriched carbon layer.

Inactive Publication Date: 2003-12-17
CENT IRON & STEEL RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But MnO 2 It is easy to form MnSiO with low melting point and fused silica into the shroud 3 (rhopyroxene) or Mn 2 SiO 4 (manganese olivine) and affect the service life of the long nozzle
In addition, the addition of the above-mentioned rolled steel scale powder is only controlled at 1-3%, which is not enough to fully oxidize the carbon in the carbon-enriched layer, and the amount of carbon added to the slab [% (m / m)] is still 6 × 10 -4

Method used

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  • Protective scoria for continuous casting of ultralow carbon steel
  • Protective scoria for continuous casting of ultralow carbon steel
  • Protective scoria for continuous casting of ultralow carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] in the attached figure 2 In the one-way heating furnace shown, the melting model experiment was carried out, and the Fe 2 o 3 The effect of content on the carbon content in the enriched carbon layer. First prepare the experimental base slag, the composition [% (m / m)] of the experimental base slag is: Na 2 O is 9, F - 8.5, Al 2 o 3 4.5, MgO 3.5, CaO 34.17, SiO 2 is 38.83, C is 1.5, and then 3, 5, 8, 10, 15% of Fe with different contents are added to the base slag respectively 2 o 3 , and mixed with the base slag to form five kinds of experimental slag. Put the corundum crucible into a one-way heating furnace and heat up with the furnace. When the temperature at the bottom of the crucible reaches 1450 ° C, the temperature is kept constant. Then, add 3% Fe 2 o 3 The experimental slag was poured into the crucible, and the crucible was taken out after 10 minutes to obtain the melting model, and the carbon-enriched layer was separated, and its carbon content was an...

Embodiment 2

[0042] The ultra-low carbon steel mold slag contact experiment was carried out in a conventional carbon tube furnace. Put 500g of industrial pure iron (with a carbon content of 0.005%) into a corundum crucible, then put it into a carbon tube furnace, heat up to 1550°C (argon flow), and after the steel is melted, add 50g of the slag from Example 2 (composition See Table 1), take out the crucible from the furnace after 3 minutes, and analyze the carbon content in the upper, middle and lower parts of the steel sample after cooling. The slag of Comparative Example 1 (see Table 1 for the composition) was measured by the same method. Table 2 shows the main properties of the slag of the examples and the comparison examples and the carburization results of the molten steel contact respectively. As can be seen from Table 2, containing 3% Fe 2 o 3 Compared with the slag of Example 2 with 1.2% FeO, relatively high viscosity and high carbon content, the carburization amount of molten s...

Embodiment 3

[0044] In the crystallizer of the slab continuous casting machine, the casting experiment of the mold flux of Example 3, Comparative Example 2 and Comparative Example 3 was carried out. The components of the mold flux of Example 3, Comparative Example 2, and Comparative Example 3 are shown in Table 1, and the cast steel type has a carbon content of less than 5×10 -3 % of ultra-low carbon steel, the tundish steel sample is taken during casting, and after the casting is completed, the casting slab is taken at the place where the tundish steel sample was taken at the corresponding time, and the carbon content is analyzed respectively. The difference between the two is regarded as casting The amount of carbon added to the slab caused by mold flux during the process. Table 3 lists the main properties of the mold slags of Example 3, Comparative Example 2, and Comparative Example 3 and the results of carburization of the slab caused by the mold slag in the casting experiment. It can...

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Abstract

The present invention relates to the treatment of molten ferroalloy and continuous casting of metal. The protective scoria for continuous casting has the chemical components in mass percengate of: Na2O 6-10, F- 7-10, Al2O3 2-8, MgO 2-5, one or two of FeO, Fe3O4 and Fe2O3 3.1-15, C 1.0-1.5, and the rest being CaO and SiO2 in the CaO/SiO2 ratio of 0.70-0.89. It is hollow grains in size of 0.7-1.08 mm. When it is used in continuous casting of ultralow carbon steel, it results in very low carbon increment.

Description

technical field [0001] The invention relates to the field of continuous casting of molten iron alloys and metals, and is particularly suitable for continuous casting crystallizers, casting carbon content [% (m / m)] in the range of 5 × 10 -3 The following ultra-low carbon steel. Background technique [0002] Usually, the mold slag for continuous casting is equipped with carbon materials. Appropriate carbon materials can control the melting speed of slag, so as to maintain a reasonable powder slag layer, semi-molten layer, and molten slag layer thickness above the crystallizer, and improve the mold slag. Excellent spreading performance, so that mold slag does not harden, etc., so as to obtain a good slab surface. It can be said that carbon plays an extremely important and irreplaceable role in the use of mold flux. However, the carbon in the mold powder often causes the carburization of molten steel, and the amount of carburization has little effect on casting general carbon-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/111
Inventor 林功文石文光李正邦肖敬魁吴杰徐润玉杨海森李永芳骆忠汉李国保邱同榜刘良田张琼予谢旭东陈宝庆
Owner CENT IRON & STEEL RES INST
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