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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: 2015-04-08
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 example is used to illustrate the preparation of TRIP600 high alumina steel slabs according to the method of the present invention.

[0040] (1) Primary smelting in converter

[0041] Add 120 tons of molten iron and 10 tons of steel scrap into a 120-ton converter for blowing (here, the 120-ton converter refers to the steel output of the converter is 120 tons), and add high-quality low-sulfur active lime and high-quality slag-making 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; one-time carbon pulling is used, and the end-point pressure gun time is not less than 60s. End blowing after 22 minutes, the end point [C] is 0.10wt%, and the end point temperature is 1680°C; the converter is tapped with a sliding plate to stop the slag, and the slag is blocked so that the amount of slag entering the ladle is 5kg / t 吨钢 When the molten steel reache...

Embodiment 2

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

[0051] Except that 800kg of synthetic slag was added during the tapping process after the primary smelting of the converter in this embodiment, a TRIP600 high-alumina steel slab was prepared in the same manner as in Example 1.

[0052] The method of this example was used to produce TRIP600 high-alumina steel with an Al content of more than 1.5 wt%.

Embodiment 3

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

[0055] Except in the continuous casting production process of this embodiment, the addition of tundish covering agent is 0.6kg / t 钢 In addition, TRIP600 high alumina steel slabs were prepared in the same manner as in Example 1.

[0056] The method of this example was used to produce TRIP600 high-alumina steel with an Al content of more than 1.5 wt%.

[0057] Steel composition (unit: wt %) and performance thereof of table 1 embodiment 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 ...

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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 invention belongs to the technical field of iron and steel smelting. Specifically, the invention relates to a production method of a high-alumina steel slab with an aluminum content exceeding 1.5 wt%. Background technique [0002] Generally, the [Al] content in steel is greatly increased to 1.5% to 2.5%, which can ensure that the steel has a high strength and plasticity index and good processing performance. However, the converter-refining-continuous casting process will face many technical difficulties in the production of this high-aluminum steel. One is how to ensure that a large amount of Al is produced by the deoxidation reaction of aluminum with the primary molten steel and converter slag. 2 o 3 The adsorption and removal of inclusions, so as to ensure the cleanliness of molten steel; the second is how to avoid aluminum in molten steel from contacting slag (especially SiO in slag) during the refining and pouring process. 2 Components) or re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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