Method for producing boron steel by converter

A boron steel and converter technology, applied in the field of boron steel production by converter, can solve the problems of short production cost, poor pourability of molten steel, long production process, etc., and achieve the effects of short production process, low production cost and high production efficiency

Inactive Publication Date: 2009-08-12
新余钢铁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to aim at the high production cost, long production process, low cost performance, poor castability of molten steel and Al 2 o 3 In order to overcome the shortcomings of high inclusions, a method for producing boron steel in a converter with low production cost, short production process, high cost performance and good pourability of molten steel is proposed.

Method used

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  • Method for producing boron steel by converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Production of SAE10B08 boron-containing steel

[0020] See attached figure 1 , 98t molten iron and 27t steel scrap are added into the top and bottom combined blowing converter, totaling 125t for blowing. Converter tapping (115t), the tapping temperature is 1660℃, argon is blown at the bottom of the ladle throughout the tapping process, the argon flow rate is 350NL / min, and the argon pressure is 0.4-0.5MPa. After tapping 1 / 4, add 92kg of deoxidizer steel core aluminum (Al: 50%) to the ladle, which is 0.8kg per ton of steel, as well as 625kg of alloy ferromanganese (Mn: 65%) and 192kg of ferrosilicon (Si: 75). %), silicon-aluminum-barium-iron 100kg (Ba: 18%) for pre-deoxidation and alloying. The order of addition is ferromanganese → ferrosilicon → silicon-aluminum-barium iron → steel core aluminum. At the same time, 100kg of desulfurizing agent is added, that is, 0.87kg per ton of steel. 300kg of lime is subjected to desulfurization treatment. The main components o...

Embodiment 2

[0022] Example 2: Production of SAE10B10 boron-containing steel

[0023] See attached figure 1 , 97t molten iron and 28t scrap steel are added into the top and bottom combined blowing converter, totaling 125t for blowing. Converter tapping (114t), tapping temperature is 1665°C, argon is blown at the bottom of ladle throughout the tapping process, argon flow rate is 340NL / min, and argon pressure is 0.4-0.5MPa. 1 / 4 of the tapping starts to add 98kg of deoxidizer steel core aluminum (Al: 48%) to the ladle, which is 0.86kg per ton of steel, as well as 728kg of alloy ferromanganese (Mn: 65%) and 236kg of ferrosilicon (Si: 75 %), 105kg of silicon-aluminum-barium-iron (Ba: 18%) for pre-deoxidation and alloying. The order of addition is ferromanganese → ferrosilicon → silicon-aluminum-barium iron → steel core aluminum. At the same time, add 80kg of desulfurizing agent, that is, 0.7kg per ton of steel. 320kg of lime is used for desulfurization. The main components of the desulfurizer are: ...

Embodiment 3

[0025] Example 3: Production of SAE10B18 boron-containing steel

[0026] See attached figure 1, 99t molten iron and 26t steel scrap are added into the top and bottom combined blowing converter, totaling 125t for blowing. The converter tapping (115t), the tapping temperature is 1670℃, argon is blown at the bottom of the ladle throughout the tapping process, the argon flow rate is 360NL / min, and the argon pressure is 0.4-0.5MPa. After tapping 1 / 4, add 115kg of steel core aluminum (Al: 49%), which is 1.0kg per ton of steel, and 1350kg of alloy ferromanganese (Mn: 65%) and 345kg of ferrosilicon (Si: 75 %), 110kg of silicon-aluminum-barium-iron (Ba: 18%) for pre-deoxidation and alloying. The order of addition is ferromanganese → ferrosilicon → silicon-aluminum-barium iron → steel core aluminum. At the same time, add 115kg of desulfurizing agent, that is, 1.0kg per ton of steel. 310kg of lime is subjected to desulfurization treatment. The main components of the desulfurizer are as follo...

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Abstract

The invention provides a method for producing boron steel in a converter, which is characterized in that argon subaeration is performed on a ladle in the whole process; a deoxidizer and alloys required by steel grades are begun to be added into the ladle for preliminary deoxidation and alloying under the condition of 1/4 tapping, and simultaneously a desulfurizer is added for desulfurization treatment; aluminum is added into the ladle in an argon blowing station for final deoxidation, and ferroboron is added into the ladle when the [O] is controlled to be between 0.0020 and 0.0040 percent; and the ferroboron is coated by an aluminum sheet and added into molten steel. The method has the advantages that: firstly, the method saves the refining procedure of an LF furnace and a vacuum furnace and has low production cost, short production procedure and high production efficiency; secondly, the pourability of the molten steel is good; thirdly, no requirement is put forward as for acid-soluble aluminum in the steel, so that the method solves the problems of pastiness of the molten steel, easy bonding of water gaps, reduction of the steel quality and the like caused by the increase of Al2O3 inclusion due to high acid-soluble aluminum; and fourthly, the recovery rate of boron can reach 60 to 75 percent and the wave range of the yield is small. Moreover, the method has good application prospect.

Description

Technical field: [0001] The invention relates to a method for smelting steel, in particular to a method for producing boron steel by a converter. Background technique: [0002] The addition of trace boron (B) in steel (the boron content in steel is generally 0.0005% to 0.0035%), the purpose is to improve the hardenability and fatigue resistance of steel, and for the production of boron-containing steel, due to the boron element The chemical properties are very active, and it is easy to react with elements such as oxygen and nitrogen in the steel during the alloying process, resulting in a low yield of boron and an unstable yield. Therefore, for the production of boron steel, metallurgical workers have long-term Has been committed to the research of boron alloying process. The existing boron steel smelting mainly has two methods: electric furnace and converter. Because there is a "reduction period" in the electric furnace smelting process, it has a good reducing atmosphere, the ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/28C21C7/072C21C7/06C21C7/064C22C33/06C22C38/32C22C38/54
Inventor 刘辉杰吴绍杰王国君王国文付军黄小山刘志芳赵和明董富军
Owner 新余钢铁股份有限公司
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