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Control method of inclusions in steel

A control method and technology for inclusions, applied in the direction of manufacturing converters, etc., can solve problems such as increasing the difficulty of smelting

Inactive Publication Date: 2011-12-07
PANZHIHUA IRON AND STEEL +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in the existing methods, the requirements for [S] (sulfur, [S] refers to sulfur in steel) in steel are usually high, and the lower the requirement, the better, which increases the difficulty of smelting

Method used

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  • Control method of inclusions in steel
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  • Control method of inclusions in steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Using semi-steel as the raw material for converter smelting, the mass percentage of steel composition is: C: 3.5%, Mn: 0.05%, Cr: 0.04%, P: 0.07%, S: 0.06%, V: 0.029%, Ti: 0.005% , the balance is Fe and unavoidable impurities.

[0058] After converter smelting, the carbon content at the end of tapping is 0.05%, and the oxygen activity (a[O]) is 480ppm. When tapping reaches 20%, an appropriate amount of aluminum and iron is added according to the carbon content of molten steel for deoxidation, and the amount of aluminum and iron added is 4.7kg / t 钢水 . The main components of the aluminum and iron are: Al: 35%-45%, Fe: 55%-65%, and the rest are unavoidable impurities. After the addition of aluminum and iron, add the required alloy according to the composition requirements of the steel type; add the first batch of 6.5kg / ton steel refining slag to the ladle when the steel is tapped to 30% for slag washing, and add it immediately after the steel is tapped Modifier 3.5Kg / t ...

Embodiment 2

[0067] The semi-steel is used as the raw material for converter smelting. The mass percentage of the composition of the semi-steel is: C: 3.6%, Mn: 0.06%, Cr: 0.05%, P: 0.065%, S: 0.07%, V: 0.028%, Ti: 0.006%, the balance is Fe and unavoidable impurities.

[0068] After converter smelting, the carbon content at the end of tapping is controlled at 0.06%, and the oxygen activity (a[O]) is controlled at 410ppm. When tapping reaches 20%, an appropriate amount of aluminum and iron is added according to the carbon content of molten steel for deoxidation, and the amount of aluminum and iron added is 4.0kg / ton of steel. The main components of the aluminum and iron are: Al: 35%-45%, Fe: 55%-65%, and the rest are unavoidable impurities. After the addition of aluminum and iron, add the required alloy according to the composition requirements of the steel type; add the first batch of 7.0kg / t to the ladle when the tapping reaches 30% 钢水 The refined slag is washed with slag, and the modif...

Embodiment 3

[0077] Using semi-steel as the raw material for converter smelting, the mass percentages of semi-steel are: C: 3.8%, Mn: 0.08%, Cr: 0.06%, P: 0.075%, S: 0.080%, V: 0.0285%, Ti: 0.004%, the balance is Fe and unavoidable impurities.

[0078] After converter smelting, the carbon content at the end of tapping is 0.08%, and the oxygen activity (a[O]) is 320ppm. During the tapping process, an appropriate amount of aluminum and iron is added according to the carbon content of molten steel for deoxidation, and the amount of aluminum and iron added is 3.5kg / ton of steel. The main components of the aluminum and iron are: Al: 35%-45%, Fe: 55%-65%, and the rest are unavoidable impurities. After the addition of aluminum and iron, add the required alloy according to the composition requirements of the steel type; add the first batch of 7.5kg / t to the ladle when the tapping reaches 30% 钢水 The refined slag is washed with slag, and the modifier 4.0Kg / t is added immediately after the steel is...

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Abstract

The invention specifically relates to a control method for inclusions in steel, which belongs to the technical field of iron and steel metallurgy. The invention provides the control method for inclusions in steel to reduce the content of inclusions. The control method comprises the following process flow: A, steel making in a converter; B, slag washing for tapoffs; C, LF refining; D, RH vacuum treatment; E, continuous casting. The key step affecting the control of inclusions is to control components of ladle slag, and the step enables effective control and reduction of the content of inclusions; T[O] of steel can be guaranteed to be no more than 20 ppm with simultaneous cooperation of sectional type calcium treatment. Inclusion grades of steel obtained by the inclusion control method provided in the invention are all low and accord with corresponding standard.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for controlling inclusions in steel. Background technique [0002] As we all know, inclusions in molten steel are generally divided into four categories: ①Plastic inclusions such as sulfides (type A inclusions in the "GB / T10561-2005" rating standard) and SiO 2 Fe-manganese silicate inclusions with low content; ② Brittle inclusions, such as Al 2 o 3 、Cr 2 o 3 , spinel oxide, etc.; ③Spherical (or point-like) non-deformable inclusions, such as SiO 2 and SiO 2 High content of silicate inclusions; ④ semi-plastic inclusions, refers to a variety of multi-phase aluminosilicate inclusions. The main impact of inclusions on the mechanical properties and process properties of steel is to reduce the material's ductility, toughness and fatigue limit, cause the directionality of material properties, deteriorate the cold and hot processing performance...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/10C21C5/28
Inventor 陈天明陈永陈亮李桂军曾建华杨文中李清春寄海明
Owner PANZHIHUA IRON AND STEEL
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