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Mold flux for continuous casting and continuous casting method

A technology of mold slag and quality, applied in the direction of improving process efficiency, etc., can solve problems such as hindering lubricity, upper limit of mold slag, and failure to prevent steel breakout, so as to prevent surface cracks, reduce temperature changes of copper plates, and prevent leaks steel effect

Active Publication Date: 2018-07-31
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the use of new mold fluxes in order to improve the efficiency of continuous casting of Al-containing steels is ignored
[0018] In addition, for example, Patent Document 1 discloses that when the freezing point is raised to 1250° C. or higher, lubricity is inhibited, and breakout cannot be prevented.
In this way, in the case of obtaining a cast slab from molten steel of hypoperitectic steel by continuous casting, there is a limit to the upper limit of the solidification point of mold flux

Method used

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  • Mold flux for continuous casting and continuous casting method
  • Mold flux for continuous casting and continuous casting method
  • Mold flux for continuous casting and continuous casting method

Examples

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Effect test

Embodiment 1

[0099] Using a vertical bending continuous casting machine with two continuous casting strands, 780 tons of molten steel having the composition shown in Table 1 were cast. In two continuous casting strands, a slab having a width of 1500 mm, a thickness of 250 mm and a length of 7000 mm was obtained. The casting speed was set at 1.5 m / min. In continuous casting, mold fluxes shown in Tables 2 to 5 were used separately for each continuous casting strand.

[0100] Table 1

[0101]

[0102] Table 2

[0103]

[0104] table 3

[0105]

[0106] Table 4

[0107]

[0108] table 5

[0109]

[0110] In order to measure the composition of the molten steel, an analysis sampler is inserted into the molten steel in the mold, and the molten steel is sampled. After the molten steel is solidified, the composition of the molten steel is determined by emission spectrum analysis. Table 1 shows the composition of the obtained molten steel. Components other than those shown in Ta...

Embodiment 2

[0122] Using the mold flux 1 in Example 1, 260 tons of molten steels of the nine compositions shown in Table 8 were continuously casted to obtain nine cast slabs.

[0123] As the continuous casting machine, the same vertical bending type continuous casting machine as in Example 1 having two continuous casting strands was used. In each casting, 12 slabs having a width of 1500 mm, a thickness of 250 mm, and a length of 7000 mm were obtained as a total of two continuous casting strands. The casting speed was set at 1.5 m / min.

[0124] In order to measure the composition of the molten steel, an analysis sampler is inserted into the molten steel in the mold, and the molten steel is sampled. After the molten steel was solidified, the composition of the molten steel was determined by emission spectroscopic analysis. The composition of the obtained molten steel is shown in Table 8. Components other than those shown in Table 8 are iron and impurities.

[0125] The results of contin...

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Abstract

The mold flux for continuous casting has a base material composition containing 25-60% by mass of CaO, 15-45% by mass of SiO2, 5-25% by mass of F, 0.2-1.0% by mass of S and 0-20% by mass of Li2O, Na2Oand K2O in total. With respect to the base material composition, f(1) is 0.90-1.90, f(2) is 0.10-0.40, f(3) is 0-0.40, and the total of CaO, SiO2, F, S, Li2O, Na2O and K2O is 90-100% by mass.

Description

technical field [0001] The present invention relates to mold flux for continuous casting and a continuous casting method. The mold flux and the continuous casting method are suitably used in order to prevent cracks from occurring on the surface of the cast slab when producing a slab of Al-containing steel and Al-containing hypoperitectic steel by continuous casting. [0002] This application claims priority based on Patent Application No. 2015-217238 filed in Japan on November 5, 2015, and the content is hereby concluded. Background technique [0003] When manufacturing a steel slab by continuous casting, molten steel solidifies in a mold (mold) to form a solidified shell. If the thickness of the solidified shell is not uniform, cracks are likely to occur on the surface of the slab. [0004] In order to prevent cracks on the surface of the slab, it is effective to make the thickness of the solidified shell in the mold uniform, that is, to slowly cool the tip of the solidif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/108B22D11/00C22C38/00C22C38/54
CPCB22D11/00B22D11/108C22C38/00C22C38/54B22D11/111C22C38/002C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38B22D11/16Y02P10/20
Inventor 花尾方史内藤大干
Owner NIPPON STEEL CORP
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