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A production method for continuous casting of steel slabs containing rare earth elements

A rare earth element and slab continuous casting technology, applied in the field of steel smelting, can solve the problems of poor surface and center quality of the casting slab, unfavorable inclusions floating, difficulty in rare earth alloying, etc., and achieves good surface and center quality of the continuous casting slab. The effect of effectively removing inclusions and stabilizing the yield of rare earth

Active Publication Date: 2017-11-03
宝武特种冶金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem of rare earth alloying in the ladle refining process is that if the timing of rare earth addition is too early, the rare earth will form a large number of oxides or sulfides, etc., and the yield of rare earth is low; if the timing of addition is too late, the inclusions generated by rare earth are difficult to float and remove. Uneven distribution in steel
[0004] The main problems of using slab continuous casting to produce rare earth-containing steel are difficult to control the degree of superheat, low casting speed, and poor quality of the surface and center of the slab.
The fluidity of molten steel is poor. When the pouring temperature is too low, the mold nozzle will be frozen and the pouring will be interrupted, which is not conducive to the floating of inclusions. Segregation and porosity
It is difficult to control parameters such as casting speed, mold nozzle insertion depth, and secondary cooling intensity; in addition, it is difficult to alloy rare earths, which leads to difficulties in continuous casting of rare earth-containing steel slabs, and it is difficult to achieve continuous casting in multiple furnaces

Method used

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  • A production method for continuous casting of steel slabs containing rare earth elements
  • A production method for continuous casting of steel slabs containing rare earth elements
  • A production method for continuous casting of steel slabs containing rare earth elements

Examples

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Effect test

Embodiment 1

[0026] The element ratio and some process parameters of the steel in this embodiment are shown in Table 1, Re: 0.15%, C: 0.01%, Si: 1.0%, Cr: 25%, Ni: 9%, N: 0.3%, and the rest The amount is iron and unavoidable impurities. The rare earth is RECe-48 or RECe-45.

[0027] During production, the main operations of the ladle furnace refining process and the continuous casting process are the same as those of the prior art. The total amount of Ca is 0.7kg / t, the weak stirring time for controlling the ladle furnace refining is 30min, the fluctuation area of ​​the steel slag interface is less than 40%, and the rare earth alloy yield is controlled at 30-70%; in the continuous casting process, the middle The superheat of the molten steel in the ladle is controlled at 65°C, the insertion depth of the nozzle of the continuous casting mold is controlled at 135mm, the electromagnetic stirring and dynamic light reduction in the secondary cooling zone are increased, the stirring current is ...

Embodiment 2

[0029] The element ratio and some process parameters of the steel in this embodiment are shown in Table 1, Re: 0.10%, C: 0.10%, Si: 1.5%, Cr: 20%, Ni: 11%, N: 0.26%, and The amount is iron and unavoidable impurities. The rare earth is RECe-48 or RECe-45.

[0030] During production, the main operations of the ladle furnace refining process and the continuous casting process are the same as those of the prior art. The total amount of Ca is 0.45kg / t, the weak stirring time for controlling the ladle furnace refining is 20min, the fluctuation area of ​​the steel slag interface is less than 40%, and the rare earth alloy yield is controlled at 30-70%; in the continuous casting process, the middle The superheat of the molten steel in the ladle is controlled at 60°C, the insertion depth of the nozzle of the continuous casting mold is controlled at 125mm, electromagnetic stirring and dynamic light reduction in the secondary cooling zone are added, the stirring current is controlled at ...

Embodiment 3

[0032] The element ratio and some process parameters of the steel in this embodiment are shown in Table 1, Re: 0.08%, C: 0.08%, Si: 1.7%, Cr: 22%, Ni: 12%, N: 0.20%, and The amount is iron and unavoidable impurities. The rare earth is RECe-48 or RECe-45.

[0033] During production, the main operations of the ladle furnace refining process and the continuous casting process are the same as those of the prior art. The total amount of Ca is 0.35kg / t, the weak stirring time for controlling the ladle furnace refining is 25min, the fluctuation area of ​​the steel slag interface is less than 40%, and the rare earth alloy yield is controlled at 30-70%; in the continuous casting process, the middle The superheat of molten steel in the ladle is controlled at 40°C, the insertion depth of the nozzle of the continuous casting mold is controlled at 115mm, the electromagnetic stirring and dynamic light reduction in the secondary cooling zone are increased, the stirring current is controlled...

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Abstract

The invention discloses a steel containing rare earth element and a producing method of slab continuous casting. The steel comprises the elements of Re, C, Si, Cr, Ni, and N according to a certain ratio, and the balance of iron and inevitable impurity; the production method comprises a ladle furnace refining process and a continuous casting operation; wherein, in the ladle furnace refining process, feeding metal Ca wire before rare earth is added in molten steel, then feeding rare earth metal wires, simultaneously passing the rare earth metal wires through the surface of slag, feeding the metal Ca wires again, controlling the weak stirring time of ladle furnace refining and slag interfacial fluctuation area; and in the continuous casting process, controlling the super-heated rate of molten steel in a tundish at 35-65 DEG C, and controlling the inserting depth of an port of a continuous casting crystallizer at 100-135 mm. Compared with the prior art, the method has the advantages of high rare earth yielding rate, and good continuous casting surface and center quality, impurity in the steel is effectively removed, and rare earth yielding rate is stable.

Description

technical field [0001] The invention relates to a production method for continuous casting of steel slabs containing rare earth elements, and belongs to the technical field of steel smelting. Background technique [0002] In addition to deoxidation, desulfurization and control of sulfide form in steel, rare earth (Re) has microalloying and dispersion strengthening effects. It can improve the as-cast structure and inhibit grain growth, thereby improving the impact toughness of steel, improving thermoplasticity, oxidation resistance, etc. Rare earths can interact with low-melting-point impurities such as phosphorus, arsenic, tin, antimony, bismuth, and lead in steel to form high-melting-point compounds and inhibit the segregation of these impurities on grain boundaries. Rare earth elements have low melting points and active chemical properties, so the control of the amount of rare earth elements is particularly critical. [0003] Rare earth has a strong affinity with oxygen,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/40C22C33/04C21C7/00B22D11/11
CPCY02P10/134
Inventor 郭亮亮黄宗泽徐正其李悦李元朱银存
Owner 宝武特种冶金有限公司
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