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Aluminum-containing low-carbon steel and preparation process

A preparation process and low-carbon steel technology, which is applied in the field of iron and steel smelting, can solve the problems of continuous casting machine shutdown, inclusions, nozzle flocculation, etc., and achieve the effects of improving purity, improving the purity of molten steel, good plasticity and toughness

Inactive Publication Date: 2022-01-28
TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing molten steel smelting, due to the carbon content in the molten steel composition, the free oxygen content in the molten steel at the end of converter smelting is relatively high. Generally, the weight percentage of oxygen in molten steel is ≥ 500ppm. During the smelting process, a large amount of Al 2 o 3 Inclusions, resulting in high content of inclusions in molten steel, resulting in nozzle flocculation during the continuous casting process, resulting in the shutdown of the continuous casting machine, which seriously affects the continuity of continuous casting production

Method used

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  • Aluminum-containing low-carbon steel and preparation process
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  • Aluminum-containing low-carbon steel and preparation process

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Experimental program
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Effect test

Embodiment 1

[0037] A production process of aluminum-containing low-carbon steel, comprising the steps of:

[0038] (1) Primary smelting of converter

[0039] (11) First add molten iron to the converter, the temperature of the molten iron entering the furnace is 1350°C, in terms of mass percentage, P0.145% and S0.050% in the molten iron, then add scrap steel to the molten iron, the total charge of molten iron and scrap steel 125t, of which scrap steel is 30t; afterward, blowing is carried out by top-bottom combined blowing for 12min, top-blowing oxygen pressure is 0.6MPa, oxygen lance flow rate is 30000Nm 3 / h, blow nitrogen 5 minutes before bottom blowing, then switch to bottom blowing argon, the flow rate of nitrogen and argon is 40Nm 3 / h, the pressure is 0.5MPa, add 3.75t of limestone and 0.875t of dolomite at the beginning of blowing, control the basicity of slag to 2.8, continue blowing and control the end point composition of converter molten steel: C 0.07%, P 0.030%, S 0.035 %, the...

Embodiment 2

[0052] A production process of aluminum-containing low-carbon steel, comprising the steps of:

[0053] (1) Primary smelting of converter

[0054] (11) First add molten iron to the converter, the temperature of the molten iron entering the furnace is 1340°C, in terms of mass percentage, P0.146% and S 0.042% in the molten iron, then add scrap steel to the molten iron, the total charge of molten iron and scrap steel 120t, of which scrap steel is 30t; afterward blowing is carried out for 15min by top-bottom combined blowing, top-blowing oxygen pressure is 0.5MPa, oxygen lance flow rate is 25000Nm 3 / h, nitrogen blowing 10 minutes before bottom blowing, then switch to bottom blowing argon, nitrogen and argon flow are both 50N m 3 / h, the pressure is 0.6MPa, add 3.96t of limestone and 0.6t of dolomite during blowing, control the basicity of slag to 3.1; continue blowing to control the end point composition of molten steel: C0.06%, P 0.030%, S 0.035% , the balance is Fe;

[0055] ...

Embodiment 3

[0067] A production process of aluminum-containing low-carbon steel, comprising the steps of:

[0068] (1) Primary smelting of converter

[0069] (11) First add molten iron to the converter, the temperature of the molten iron entering the furnace is 1430°C, in terms of mass percentage, P0.145% and S0.040% in the molten iron, then add scrap steel to the molten iron, the total charge of molten iron and scrap steel 120t, of which scrap steel is 30t; afterward blowing is carried out by top-bottom combined blowing for 10min, top-blowing oxygen pressure is 1.0MPa, oxygen lance flow rate is 20000Nm 3 / h, nitrogen blowing 10 minutes before bottom blowing, then switch to bottom blowing argon, nitrogen and argon flow are both 45N m 3 / h, the pressure is 0.4MPa, add limestone 4.8t and dolomite 1.2t during blowing, control the basicity of slag to 3.5, continue blowing to control the end point composition of molten steel: C0.06%, P 0.028%, S 0.032% , the balance is Fe;

[0070] (12) Tap...

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Abstract

The invention discloses aluminum-containing low-carbon steel and a preparation process, and belongs to the technical field of steel smelting, the preparation process is as follows: converter primary smelting: (11) after scrap steel is added into molten iron, top-bottom combined blowing is adopted for blowing, a slagging material is added during blowing, the basicity of slag is controlled to be 2.8-3.8, and blowing continues; (12) tapping is performed; refining: (21) after the molten steel enters a CAS furnace, argon blowing, temperature measurement, sampling and analysis are carried out; (22) component adjustment, alloy addition, argon blowing, temperature measurement and sampling are performed according to an analysis result; (23) tapping is performed; and continuous casting: the temperature of a crane ladle is 1595-1605 DEG C, the temperature of a tundish is 1547-1567 DEG C, pouring is performed at a constant pulling speed, and the pulling speed of a casting blank is 0.9-1.25 m / min. According to the preparation process, the purity of the molten steel can be improved, and inclusions in the molten steel are reduced.

Description

technical field [0001] The application relates to the technical field of iron and steel smelting, in particular to an aluminum-containing low-carbon steel and its preparation process. Background technique [0002] With the rapid development of the market economy, the development of high-end industries such as home appliances, automobiles, instruments, radios, national defense and aerospace industries has continuously put forward higher requirements for the specifications, surface quality, mechanical properties and dimensional deviation of strip steel. When it is reduced to a certain size of thin strip steel, the production of hot-rolled strip steel is far from meeting the development needs of all walks of life, and the production of cold-rolled strip steel has received enough attention and development in daily life. [0003] In the existing molten steel smelting, due to the carbon content in the molten steel composition, the free oxygen content in the molten steel at the end...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/06C21C5/35C21C5/36C21C7/072C22C38/02C22C38/04C22C38/06C22C38/08C22C38/16
CPCC22C33/06C21C5/35C21C5/36C21C7/072C22C38/02C22C38/04C22C38/06C22C38/08C22C38/16Y02P10/20
Inventor 温国栋薛伟白澈力格尔李新文金鑫陈平崔瑞栋谷召坤
Owner TIANJIN RONGCHENG UNITED IRON & STEEL GRP CO LTD
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