Preparation method of molten steel deoxidizing agent

A technology of deoxidizer and molten steel, which is applied in the field of iron and steel smelting, can solve the problems of deteriorating steel quality, low utilization rate of deoxidizer, and lower deoxidation efficiency, so as to achieve the effects of improving strength and toughness, improving the production of deoxidation products, and improving deoxidation capacity

Inactive Publication Date: 2017-12-01
常州市协旺纺织品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method for preparing a molten steel deoxidizer for the low utilization rate of the existing deoxidizer, which reduces the deoxidation efficiency, and the metal recovery rate after deoxidation at the same time, and deteriorates the quality of the steel.

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  • Preparation method of molten steel deoxidizing agent

Examples

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Effect test

example 1

[0021] According to the mass ratio of 1:10, lanthanum oxide and boron powder were mixed, vacuum-dried and placed in a ball mill jar, ball milled at 600r / min for 5h, passed through a 200 mesh sieve to obtain ball mill powder, collected ball mill powder and placed in a mold, After pressing at room temperature and 30MPa for 2 minutes, the billet is obtained. Place the billet in a tubular atmosphere furnace, pass argon to remove the air, and raise the temperature to 1600°C at a rate of 10°C / min under the argon atmosphere. After heat preservation and calcination, let it stand for cooling to room temperature, broken and ball-milled through a 500-mesh sieve to obtain a modified powder; take manganese metal and ball-mill it through a 200-mesh sieve to obtain a metal manganese powder. In parts by weight, 120 parts of A00 aluminum, 5 parts of metal manganese powder and 0.5 parts of Put manganese chloride in a graphite crucible, heat-preserve and melt at 1000°C to obtain an alloy melt, th...

example 2

[0023] According to the mass ratio of 1:10, lanthanum oxide and boron powder were mixed, vacuum-dried and placed in a ball mill jar, ball milled at 550r / min for 3h, passed through a 200 mesh sieve to obtain ball mill powder, collected ball mill powder and placed in a mold, After pressing for 1min at room temperature and 25MPa, the billet is obtained. Place the billet in a tubular atmosphere furnace, pass argon to remove the air, and raise the temperature to 1500°C at a rate of 10°C / min under the argon atmosphere. After heat preservation and calcination, let it stand for cooling to room temperature, broken and ball-milled through a 500-mesh sieve to obtain a modified powder; take manganese metal and ball-mill it through a 200-mesh sieve to obtain a metal manganese powder, in parts by weight, get 100 parts of A00 aluminum, 3 parts of metal manganese powder and 0.1 part of Put manganese chloride in a graphite crucible, heat-preserve and melt at 900°C to obtain an alloy melt, then ...

example 3

[0025] According to the mass ratio of 1:10, lanthanum oxide and boron powder were mixed, vacuum-dried and placed in a ball mill jar, ball milled at 570r / min for 4h, passed through a 200 mesh sieve to obtain ball mill powder, collected ball mill powder and placed in a mold, After pressing at room temperature and 27MPa for 1min, the billet is obtained. Place the billet in a tubular atmosphere furnace, pass argon to remove the air, and raise the temperature to 1550°C at a rate of 10°C / min under the argon atmosphere. After heat preservation and calcination, let it stand for cooling to room temperature, broken and ball-milled through a 500-mesh sieve to obtain a modified powder; take manganese metal and ball-mill it through a 200-mesh sieve to obtain a metal manganese powder, in parts by weight, get 110 parts of A00 aluminum, 4 parts of metal manganese powder and 0.3 parts Put manganese chloride in a graphite crucible, heat-preserve and melt at 950°C to obtain an alloy melt, then ad...

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Abstract

The invention relates to a preparation method of a molten steel deoxidizing agent and belongs to the technical field of iron and steel smelting. The preparation method comprises the steps that lanthanum oxide and boron powder are mixed, ball-milled, sieved and then pressed, and a billet is obtained; the billet is cooled to the room temperature after being calcined and then is crushed and ball-milled, and modified powder is obtained; A00 aluminum, metal manganese powder and manganese chloride are melted, and alloy melt is obtained; and the modified powder is added into the alloy melt to be stirred and mixed, the mixture is cooled to the room temperature after heating melting and segmented cooling are conducted, and the mixture is crushed, ball-milled and sieved. According to the preparation method, manganese and aluminum are compounded to prepare an alloy material, and the alloy material conforms to molten steel in density, so that the floating speed is remarkably reduced after the alloy material is thrown into the molten steel; the alloy material too late to dissolve suspends in the molten steel, the upper half portion of the alloy material is oxidized by furnace slag possibly, the lower half portion of the alloy material can still continue suspending in the molten steel for deoxygenation treatment, and the metal recovery rate is effectively increased; and meanwhile generation of intragranular acicular ferrite in steel is effectively promoted while the molten steel material is deoxidized, so that the performance of a steel material is improved.

Description

technical field [0001] The invention relates to a method for preparing a molten steel deoxidizer, belonging to the technical field of iron and steel smelting. Background technique [0002] With the continuous advancement of metallurgical technology and the increasing requirements of the market for the quality of steel products, some special steel grades have very strict requirements on the quantity and form of non-metallic inclusions in steel. Experiments have shown that when oxygen in steel [0003] The quality score of the 30×10 -6 Reduced to 10×10 -6 When the oxygen content is less than that, the contact fatigue life can be increased by nearly 30 times, which greatly improves the performance of the steel. Therefore, how to reduce the oxygen content in the steel and improve the purity of the steel is particularly important. [0004] The deoxidizers currently used in production mainly include common deoxidizers such as ferromanganese, ferrosilicon, and aluminum, as well ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06
CPCC21C7/06
Inventor 邵俊英薛焱璟季美
Owner 常州市协旺纺织品有限公司
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