Mould powder for continuous casting of steel

A powder and mold technology, applied in the field of mold powder for continuous casting, can solve the problems of poor lubrication and unstable heat removal of the mold, and achieve the effect of stable heat removal

Active Publication Date: 2012-10-03
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] In addition, in Al-containing steel, there is also a problem of poor lubrication or unstable heat removal in the crystallizer due to the precipitation of high-melting point crystals, that is, kelpite in the powder.

Method used

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  • Mould powder for continuous casting of steel
  • Mould powder for continuous casting of steel

Examples

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Effect test

Embodiment

[0093] Examples are given below to describe the present invention in detail.

[0094] In the vacuum refining furnace (RH), 300 tons of molten steel smelted in a converter is adjusted to a specified component concentration, and the molten steel of ultra-low carbon steel obtained in this way is passed through a tundish and a submerged nozzle, and cast with a vertical curved continuous casting machine A slab with a thickness of 250mm and a width of 1600mm was formed. The casting speed was set at 1.8 m / min.

[0095] Table 1 and Table 2 (continued from Table 1) show the powder composition, physical property values, and Al and Ti concentrations in the cast molten steel. Powder Nos. 1 to 21 and 50 are examples of the present invention. Nos. 22 to 41 and 51 are comparative examples.

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Abstract

Provided is a mould powder for continuous casting that is used in order to continuously cast steel containing at least one of Al and Ti. The mould powder has a CaO / SiO2 mass ratio of 1.0 to 1.5. The mould powder contains 15 to 30 mass% of SiO2, 30 to 40 mass% of CaO, 3 to 25 mass% of Al2O3, 2 to 6 mass% of Na2O, more than 2 mass% but 10 mass% or less of F added in the form of CaF2 or NaF, and 1 to 4 mass% of B2O3 such that thesum of the mass% of SiO2, Na2O, and B2O3 is 20 to 40 mass% and the remainder is inevitable impurities. The mould powder has a viscosity at 1,300 C of 0.5 to 8 poise.

Description

technical field [0001] The present invention relates to a mold powder for continuous casting that is added to a casting mold and used in continuous casting of steel. Background technique [0002] During continuous casting of molten steel, mold powder (hereinafter sometimes referred to as "powder") is added to the surface of the molten steel in the mold. The powder requires the following characteristics. [0003] 1) The molten powder layer formed by melting the powder on the molten steel surface and the unmelted powder layer on it cover the molten steel surface, and the contact with the air is isolated, so as to prevent the reoxidation of the molten steel and keep it warm Effect. [0004] 2) The molten powder must flow between the crystallizer and the solidification shell to function as a lubricant, so it is necessary to always supply an appropriate amount of powder to adapt to the consumption rate of the powder, so as to achieve the melting speed of an appropriate amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/108B22D11/00C21C7/076
CPCB22D11/111C21C7/076Y02P10/20
Inventor 峰田晓梶谷敏之山村英明
Owner NIPPON STEEL CORP
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