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Production method for reducing calcium aluminate inclusions in aluminum killed steel

A calcium-aluminate and aluminum-killed steel technology, which is applied in the manufacture of converters, etc., can solve the problems of residual, small amount of calcium-treated products, and lack of effective collision, etc., and achieve simple process and reduce the large particle size of calcium-aluminate Inclusions, the effect of improving the quality of molten steel and product performance

Inactive Publication Date: 2019-09-20
XINGTAI IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, liquid calcium aluminate inclusions have a small contact angle with molten steel and high wettability, so it is difficult to separate from molten steel / enter the slag, but stay at the steel-slag interface; this part of the calcium treatment product It is very likely to be involved in the molten steel again, resulting in the remaining calcium-aluminate inclusions with larger particle sizes in the steel
In addition, due to the small amount of calcium-treated products and the lack of effective collisions, they failed to aggregate into calcium-aluminate inclusions with larger particle sizes. This part of calcium-treated products (with a particle size generally <30 μm) lacks sufficient floating time. will remain in the steel
The above two reasons eventually lead to the steel grades treated with Ca, which are prone to the problem of exceeding the standard of D and Ds inclusions

Method used

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  • Production method for reducing calcium aluminate inclusions in aluminum killed steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: The specific process of the production method for reducing calcium-aluminate inclusions in aluminum-killed steel is as follows.

[0015] 40Cr is smelted, the end point C of the converter is 0.12%, the tapping temperature is 1600°C, and the slag is blocked by the sliding plate to tap; 3.7kg / t lime and 1.18kg / t bauxite are added after the furnace for slag modification; the tapping process is bottom-blown For argon, 1.2kg / t of aluminum block, 4.5kg / t of silicomanganese and 13.4kg / t of ferrochrome are added sequentially when tapping 20t of steel, and the oxygen position after argon is 60ppm. LF enters the station to heat up and produce white slag. After producing white slag, feed 0.08kg / t aluminum-calcium cored wire into the ladle for final deoxidation of molten steel. After the soft blowing is completed, before the ladle is cast on the machine, feed 0.03kg / t pure calcium wire into the ladle to treat the molten steel with Ca, and then cast it on the machine; t...

Embodiment 2

[0016] Embodiment 2: The specific process of the production method for reducing calcium-aluminate inclusions in aluminum-killed steel is as follows.

[0017] Smelting 35K, converter end point C is 0.09%, tapping temperature 1648°C, sliding plate slag blocking tapping; 5.0kg / t lime and 0.9kg / t bauxite are added after the furnace for slag modification; bottom blowing throughout the tapping process For argon, 1.6kg / t of aluminum block, 4.95kg / t of silicomanganese and 1.0kg / t of ferromanganese and other alloys are sequentially added when tapping 28t, and the oxygen position after argon is 53ppm. LF enters the station to heat up and produce white slag. After producing white slag, feed 0.07kg / t aluminum-calcium cored wire into the ladle for final deoxidation of molten steel. After the soft blowing is completed, before the ladle is cast on the machine, feed 0.01kg / t pure calcium wire into the ladle to treat the molten steel with Ca, and then cast it on the machine; the temperature of...

Embodiment 3

[0018] Embodiment 3: The specific process of the production method for reducing calcium-aluminate inclusions in aluminum-killed steel is as follows.

[0019] Smelting 35K, converter end point C is 0.06%, tapping temperature 1680°C, sliding plate slag blocking tapping; 6.3kg / t lime and 0.7kg / t bauxite are added after the furnace for slag modification; bottom blowing throughout the tapping process For argon, 2.4kg / t of aluminum block, 5.3kg / t of silicomanganese and ferromanganese and other alloys are sequentially added when tapping 30t, and the oxygen position after argon is 40ppm. LF enters the station to heat up and produce white slag. After producing white slag, feed 0.04kg / t aluminum-calcium cored wire into the ladle for final deoxidation of molten steel. After the soft blowing is completed, before the ladle is cast on the machine, feed 0.04kg / t pure calcium wire into the ladle to treat the molten steel with Ca, and then cast it on the machine; the temperature of the machine...

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Abstract

The invention discloses a production method for reducing calcium aluminate inclusions in aluminum killed steel. The production method comprises the steps of converter smelting process, LF refining process and casting process, wherein in the converter smelting process, aluminum blocks are added into liquid steel in steel tapping process to carry out initial deoxidation on the liquid steel; in the LF refining process, Al-Ca alloy composite deoxidation is carried out on the liquid steel after white slag is generated in the liquid steel; in the casting process, calcium lines are fed into a ladle before casting so as to carry out Ca treatment the liquid steel. According to the production method for reducing the calcium aluminate inclusions in the aluminum killed steel, the aluminum blocks are used for performing the initial deoxidation, the Al-Ca alloy is used for carrying out final deoxidation, the calcium lines are used for carrying out modification treatment, so that the calcium aluminate inclusions of large particle size can be effectively removed and the standard exceeding problem of D type and Ds Type inclusions in the aluminum killed steel can be solved. The production method for reducing the calcium aluminate inclusions in the aluminum killed steel has the advantages of being simple and efficient in process and can effectively reduce the calcium aluminate inclusions of larger particle size in the aluminum killed steel, thus effectively improving liquid steel quality and product performance of the aluminum killed steel .

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, in particular to a production method for reducing calcium-aluminate inclusions in aluminum-killed steel. Background technique [0002] At present, the refining process of "Al deoxidation + Ca treatment" is generally adopted for ultra-low oxygen steel. The purpose of calcium treatment is to reduce the deoxidation product Al 2 o 3 Denatured into low-melting calcium-aluminate inclusions (such as 12CaO•7Al 2 o 3 ), to promote the floating and removal of inclusions in molten steel, improve the cleanliness of molten steel, and reduce nozzle nodules. However, in molten steel after calcium treatment, part of calcium treatment products aggregated into liquid calcium-aluminate inclusions with larger particle size through collision, and floated to the surface of molten steel. Compared with liquid inclusions, solid inclusions have a larger contact angle with molten steel and poorer wett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C5/28C21C7/00
CPCC21C5/28C21C7/0006C21C7/0056C21C7/06
Inventor 王晓英田新中王刚赵剑飞孟耀青逯志方赵昊乾李永超王成杰黄翠环
Owner XINGTAI IRON & STEEL
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