Method for continuously casting steel, and refractory used in continuous casting of steel

A technology of refractory materials and raw materials, applied in the field of refractory materials, can solve the problems of large damage to molten steel and shortened life of sliding nozzles, and achieve the effect of stable and continuous casting

Active Publication Date: 2014-04-16
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For molten steel containing such components, if a sliding nozzle made of a conventional alumina-carbon refractory material is used, the molten steel passing surface or sliding surface will be greatly damaged, and there is a problem that the life of the sliding nozzle will be shortened.

Method used

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  • Method for continuously casting steel, and refractory used in continuous casting of steel
  • Method for continuously casting steel, and refractory used in continuous casting of steel
  • Method for continuously casting steel, and refractory used in continuous casting of steel

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Embodiment

[0072] Next, examples of the present invention will be described, but the present invention is not limited thereto.

[0073] [1] Experimental method

[0074] Such as image 3As shown, in the crucible 7 made of zirconia, 6.1 kg of molten steel M containing lead-free free-cutting steel is put into the molten steel M, and the molten steel M is heated and kept by induction heating in an Ar atmosphere, so that the temperature of the molten steel reaches about 1550°C. . 600 g of synthetic slag S shown in Table 1 below was thrown into this molten steel M, and experimental conditions corresponding to continuous casting of lead-free free-cutting steel were set. The composition of molten steel M is set at Mn=1.2 mass%, O=0.015 mass%, Al≤0.002 mass%, C=0.07 mass%, Si=0.008 mass%, P=0.08 mass%, S=0.4 mass%, N=0.008% by mass, B=0.01% by mass.

[0075] Table 1

[0076] Element

quality%

CaO

30.0

SiO 2

35.0

MnO 2

30.0

B 2 ...

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Abstract

Disclosed is a method for continuously casting steel, wherein molten steel is supplied into a container through a sliding nozzle which is obtained by kneading and molding a starting material that contains not less than 45% by mass but not more than 94% by mass of a spinel material having a theoretical composition, not less than 1% by mass but not more than 50% by mass of an alumina material, not less than 1% by mass but not more than 7% by mass of Al metal, not less than 0.5% by mass but not more than 2% by mass of Si metal, not less than 0.5% by mass but not more than 4% by mass of a carbon material, not less than 0.1% by mass but not more than 1% by mass of B4C, and the balance including unavoidable impurities, to said starting material not less than 2% by mass but not more than 6% by mass of a binder being added relative to the total mass of the starting material.

Description

technical field [0001] The present invention relates to a continuous casting method of steel and a refractory material used in continuous casting of steel. [0002] This application claims priority based on Japanese Patent Application Japanese Patent Application No. 2009-127876 filed on May 27, 2009, and the content thereof is incorporated herein. Background technique [0003] In continuous casting of steel, when pouring molten steel from a ladle to a tundish, or from a tundish to a mold through a submerged nozzle, a sliding nozzle with a molten steel passage hole is used to adjust the flow rate of molten steel. [0004] The sliding nozzle is formed by stacking a plurality of plate-shaped bodies in which passage holes are formed. By sliding the plate-shaped body, the opening degree of the passing hole of the molten steel can be adjusted, thereby adjusting the flow rate of the molten steel. [0005] However, high-oxygen steel, lead-free free-cutting steel, high-manganese st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/32B22D11/00B22D11/10B22D41/54C04B35/443C22C38/00C22C38/60
CPCB22D41/54C22C38/002C04B2235/428C04B35/443C04B35/62665C04B2235/9676C22C38/02C04B2235/425C04B2235/422C04B2235/3217C22C38/60B22D41/32B22D11/10C04B2235/80C04B2235/424C04B2235/3821C22C32/00C04B35/63476C04B35/013C04B35/103C04B2235/5427C04B2235/401C04B2235/3222
Inventor 伊藤智松井刚宫本健一郎后藤洁骏河俊博胁田保
Owner NIPPON STEEL CORP
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