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Method for producing high-aluminum steel plate blanks

A steel slab and high-aluminum technology, which is applied in the production field of high-aluminum steel slabs, can solve the problems of complex process, low production efficiency, and difficulty in reaching 1.5wt%, etc., and achieves the effect of simple process, easy control and good ventilation effect.

Active Publication Date: 2013-04-03
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this production method, the electric arc furnace is used as the primary smelting furnace, the production efficiency is low, the cost is high, and the refining process requires slag removal, which is relatively complicated
In addition, the aluminum content in the steel described in the invention patent application with the notification number CN102069157A is 0.7wt%~1.1wt%, which is difficult to reach more than 1.5wt%, and this method is mainly used for billet production, which is difficult to meet the production requirements. Requirements for slab continuous casting production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment is used to illustrate the preparation of TRIP600 high-aluminum steel slab according to the method of the present invention.

[0040] (1) Primary refining of converter

[0041] Add 120 tons of molten iron and 10 tons of scrap steel into the 120-ton converter (here, the 120-ton converter refers to the converter’s output of 120 tons), and add high-quality low-sulfur active lime and high-quality slagging materials. The addition is completed 3 minutes before the end point, and the single slag process is used for smelting, and the final slag alkalinity is controlled at about 3.5; once the carbon is pulled, the end pressure gun time is not less than 60s. Blowing ends after 22 minutes, the end point [C] is 0.10wt%, and the end temperature is 1680℃; the converter tapping adopts a sliding plate to stop the slag tapping, and the slag stop makes the amount of slag entering the ladle 5kg / t Tons of steel , When the molten steel reaches 1 / 4, start to add medium manganese ...

Embodiment 2

[0050] This example is used to illustrate the preparation of TRIP600 high-aluminum steel slab according to the method of the present invention.

[0051] In this embodiment, except that 800 kg of synthetic slag is added during the tapping process after the initial refining of the converter, the TRIP600 high-aluminum steel slab is prepared in the same manner as in the first embodiment.

[0052] The method of this embodiment is used to produce TRIP600 high-aluminum steel with an Al content of more than 1.5wt%. The steel grade composition standard and production test data are shown in Table 1.

Embodiment 3

[0054] This example is used to illustrate the preparation of TRIP600 high-aluminum steel slab according to the method of the present invention.

[0055] Except in the continuous casting production process of this embodiment, the addition amount of the tundish covering agent is 0.6kg / t steel Otherwise, a TRIP600 high-aluminum steel slab was prepared in the same manner as in Example 1.

[0056] The method of this embodiment is used to produce TRIP600 high-aluminum steel with an Al content of more than 1.5wt%. The steel grade composition standard and production test data are shown in Table 1.

[0057] Table 1 Steel grade composition (unit: wt%) and properties of Examples 1 to 3

[0058] Test items

C

Si

Mn

P

S

Alt

Ceq

T[O]

N

Standard

≤0.20

≤0.50

≤1.70

≤0.035

≤0.035

1.50-2.0

≤0.44

≤0.004

Example 1

0.15

0.18

1.49

0.017

0.002

1.52

0.41

0.0021

0.0031

Example 2

0.15

0.08

1.48

0.015

0.003

1.58

0.41

0.0016

0.0032

Example 3

0.15

0.11

1.50

0.019

0.003

1.54

0.41

0.0019

0.0027

...

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PUM

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Abstract

The invention provides a method for producing high-aluminum steel plate blanks. The method comprises the following steps: primarily smelting, wherein in the process, argon serves as bottom blowing gas and the end-point carbon content is controlled to be not less than 0.06 weight percent; strictly controlling the slag discharge amount in the tapping process, performing deoxidation alloying and recarburization on molten steel and slagging; performing ladle furnace (LF) refining, conveying the molten steel to an LF station, and feeding an aluminum wire for the first time while weakly stirring by using the argon; after feeding aluminum for the first time, stirring by using the argon, adjusting the temperature, adding aluminum (Al) particle to diffuse and deoxidize, so as to guarantee white slag operation, and feeding aluminum for the second time; performing Ruhrstahl and Heraeus (RH) vacuum treatment and component fine adjustment on the molten steel after feeding the aluminum for the second time, so as to adjust the Al content to be over 1.5 weight percent and adjust other alloy component content to be within the required range; and injecting the molten steel into a tundish, pouring the molten steel into a plate blank continuous casting crystallizer from the tundish and finishing the continuous casting production to obtain the high-aluminum steel plate blanks.

Description

Technical field [0001] The present invention belongs to the technical field of iron and steel smelting. Specifically, the present invention relates to a method for producing a high-aluminum steel slab with an aluminum content exceeding 1.5 wt%. Background technique [0002] Generally, increasing the [Al] content in steel to 1.5% to 2.5% can ensure that the steel has a high plastic index and good processing properties. However, the converter-refining-continuous casting process to produce such high-aluminum steel will face many technical problems. One is how to ensure that a large amount of Al is generated by the deoxidation reaction between aluminum and the primary molten steel and converter slag. 2 O 3 Adsorption and removal of inclusions to ensure the cleanliness of molten steel; second, how to avoid aluminum in molten steel from contacting slag (especially SiO in slag) during refining and pouring. 2 Component) or refractory material undergoes a reduction reaction, thereby avoidi...

Claims

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Application Information

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IPC IPC(8): C21C5/30C21C7/00C21C7/10C21C7/072B22D11/111B22D11/18
Inventor 王博杨州张冠锋刘美刘洪银马琳
Owner LAIWU IRON & STEEL GRP
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