Composite modification material for reducing oxidizability of molten low-carbon-aluminum killed steel

A low-carbon aluminum killed steel and composite modification technology is applied in the field of ladle slag to achieve the effects of reducing oxidizability, reducing treatment costs and increasing the number of continuous pouring furnaces

Active Publication Date: 2010-09-22
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the invention is to propose a modified material for ladle that solves the problem of the oxidation of molten steel in low-carbon aluminum-killed steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment 1, CaF in ladle slag modifier 2 、Al 2 o 3 , CaO, MgO, passivated calcium carbide (CaC 2 ), its weight percent content is respectively 13.0%, 16.0%, 51.5%, 4.5%, 15.0%; Al, CaF 2 、Al 2 o 3 , CaO, MgO, its weight percent content is respectively 23.0%, 9.0%, 29.0%, 26.0%, 13.0%, and the particle size range is 5~30 (mm). The present invention has adopted following control standard: 1) ladle slag modifier ton steel consumption 4.5kg / t, take the production mode of bulk material mixing, pack 10kg / bag (moisture-proof) plus ton bag, guarantee to meet production needs The mixing state is also convenient for on-site addition and use; 2) The amount of the ladle slag modification accelerator per ton of steel is 0.3kg / t, and the pre-melting method is used for production, which is conducive to the accurate use of the material.

Embodiment 2

[0010] Embodiment 2, CaF in ladle slag modifier 2 、Al 2 o 3 , CaO, MgO, passivated calcium carbide (CaC 2 ), its weight percent content is respectively 12.0%, 16.0%, 49.0%, 5.0%, 18.0%; Al, CaF 2 、Al 2 o 3 , CaO, MgO, its weight percent content is respectively 25.0%, 11%, 28.0%, 24.0%, 12.0%, and the particle size range is 5~30 (mm). The amount of ladle slag modifier used per ton of steel is 4.5kg / t, the amount of ladle slag modification accelerator used per ton of steel is 0.4kg / t, and the rest are the same as in Example 1.

Embodiment 3

[0011] Embodiment 3, CaF in ladle slag modifier 2 、Al 2 o 3 , CaO, MgO, passivated calcium carbide (CaC 2 ), its weight percent content is respectively 7.0%, 25.0%, 45.0%, 8.0%, 20.0%; Al, CaF 2 、Al 2 o 3 , CaO, MgO, its weight percent content is respectively 20.0%, 10.0%, 30.0%, 30.0%, 10.0%, and the particle size range is 5~30 (mm). The amount of ladle slag modifier used per ton of steel is 4.5kg / t, the amount of ladle slag modification accelerator used per ton of steel is 0.5kg / t, and the rest are the same as in Example 1.

[0012] Effect of use: 38 furnaces of low-carbon aluminum-killed steel were selected for testing. The original ∑(FeO+MnO) was 8-10%. There are 32 furnaces, the average (FeO+MnO)% is 3.13%, and the pass rate is 84.2%. Excluding the 3 furnaces that do not meet the test conditions due to abnormal conditions such as rhythm influence, the effective pass rate is 91.4%, meeting the goal of more than 80%. Require.

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Abstract

The invention aims to provide a steel ladle modification material for solving the oxidizability problem of molten low-carbon-aluminum killed steel. For fulfilling the aim of the invention, the invention adopts a technical scheme that a ladle slag modifier and a ladle slag modification promoter are used at the same time. The modifier comprises 7 to 15 weight percent of CaF2, 11 to 20 weight percent of Al2O3, 42 to 55 weight percent CaO, 3 to 8 weight percent of MgO and 5 to 20 weight percent of passive calcium carbide (CaC2). The modification promoter comprises 20 to 27 weight percent of Al, 5 to 10 weight percent of CaF2, 25 to 32 weight percent of Al2O3, 22 to 30 weight percent of CaO and 10 to 14 weight percent of MgO, and the grain size of the modification promoter ranges from 5 to 30 millimeters. In the modification material, the ladle slag modifier is used an a main material, the amount of the promoter which serves as a regulation additive is small, and the weight ratio of the amount of the ladle slag modifier to that of the ladle slag modification prompter is (9-20):1.

Description

Technical field: [0001] The invention relates to ladle slag in metallurgical auxiliary materials, in particular to a composite modified material for reducing oxidation of molten steel in low-carbon aluminum-killed steel. Background technique: [0002] In the converter steelmaking process, alloys such as aluminum and iron are added to deoxidize the molten steel. The Σ(FeO+MnO) in the slag is generally 8-10%. At this time, the deoxidized products and inclusions in the molten steel are difficult to float. As the temperature of molten steel decreases continuously, the solubility of oxygen in steel decreases, and after oxygen precipitates, it reacts with aluminum in steel to form a large amount of Al 2 o 3 , become an important source of molten steel pollution and submerged nozzle blockages, and eventually cause production obstacles and quality problems. The solution to this problem is currently mainly achieved through refining treatment methods such as RH process and CAS treat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/076
CPCY02P10/20
Inventor 陈志平郭振和左康林邹俊苏唐洪乐倪修华
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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