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Method for eliminating duplex stainless steel bubbles

A technology of duplex stainless steel and stainless steel, which is applied in the field of duplex stainless steel to eliminate bubbles in duplex stainless steel. It can solve the problems of bubble defects in billets, affect the quality of duplex stainless steel, and large heat absorption of tundish, so as to reduce temperature drop, The effect of eliminating bubble defects

Active Publication Date: 2020-06-26
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the high nitrogen content in the duplex stainless steel molten steel, in the early stage of the continuous casting process, the tundish absorbs a lot of heat, the temperature drop of the molten steel from liquid to solid is large, and the gas in the steel is easy to precipitate during solidification, which will cause bubble defects inside the slab , affecting the quality of duplex stainless steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The steel grade of this example is duplex stainless steel S32205, the cross-section of continuous casting billet is 200×2000mm 2 , The mass percentage of the chemical composition of the finished product:

[0040] C≤0.03; Si≤1.00; Mn≤2.00; P≤0.030; S≤0.020;

[0041] Cr 21.00-23.00; Ni 4.50-6.50; Mo 3.00-3.50; N 0.08-0.20; the rest are Fe and unavoidable impurities.

[0042] The implementation steps are as follows:

[0043] (1) One tundish with 3 furnaces of continuous casting, the first furnace of stainless steel 316L, the second and third furnaces of continuous casting of duplex stainless steel S32205.

[0044] (2) The casting of the 316L ladle in the first furnace is completed, and the molten steel in the tundish continues to be cast. When the molten steel in the tundish is poured to 12t, the pulling speed is reduced from 0.9m / min to 0.4m / min; the molten steel in the tundish is poured to 8t When the casting speed is reduced from 0.4m / min to 0.1m / min; when the tundish molten ste...

Embodiment 2

[0049] The steel grade of this example is duplex stainless steel S32101, the cross-section of continuous casting billet is 200×1300mm 2 , The mass percentage of the chemical composition of the finished product:

[0050] C≤0.04; Si≤1.0; Mn 4.00-6.00; P≤0.040; S≤0.030;

[0051] Cr 21.00-22.00; Ni 1.35-1.70; Mo 0.10-0.80; Cu 0.10-0.80;

[0052] N 0.20-0.25; the rest is Fe and unavoidable impurities.

[0053] The implementation steps are as follows:

[0054] (1) One tundish with 3 furnaces of continuous casting, the first furnace of stainless steel 301L, the second and third furnaces of continuous casting of duplex stainless steel S32101.

[0055] (2) The casting of the 301L ladle in the first furnace is completed, and the molten steel in the tundish continues to be cast. When the molten steel in the tundish reaches 12t, the continuous casting speed is reduced from 0.9m / min to 0.4m / min; the molten steel in the tundish is poured At 8t, the continuous casting speed is reduced from 0.4m / min to...

Embodiment 3

[0060] The steel grade of this example is duplex stainless steel S32205, the cross-section of continuous casting billet is 200×2000mm 2 , The mass percentage of the chemical composition of the finished product:

[0061] C≤0.03; Si≤1.00; Mn≤2.00; P≤0.030; S≤0.020;

[0062] Cr 21.00-23.00; Ni 4.50-6.50; Mo 3.00-3.50; N 0.08-0.20; the rest are Fe and unavoidable impurities.

[0063] The implementation steps are as follows:

[0064] (1) One tundish with 3 furnaces of continuous casting, the first furnace of stainless steel 316L, the second and third furnaces of continuous casting of duplex stainless steel S32205.

[0065] (2) The casting of the 316L ladle in the first furnace is completed, and the molten steel in the tundish continues to be cast. When the molten steel in the tundish reaches 10t, the continuous casting speed is reduced from 0.9m / min to 0.3m / min; At 7t, the continuous casting speed is reduced from 0.3m / min to 0.05m / min; when the tundish molten steel is poured to 4t, the seco...

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Abstract

The invention belongs to the technical field of continuous casting, and relates to a method for eliminating duplex stainless steel bubbles. The method comprises the steps that when a continuous casting blank is produced, at least one furnace of non-duplex stainless steel is continuously cast, then duplex stainless steel and the non-duplex stainless steel are continuously cast, and finally a transition blank generated when the non-duplex stainless steel and the duplex stainless steel are connected is cut off. According to the method for eliminating the duplex stainless steel bubbles, the temperature drop of duplex stainless steel molten steel from the liquid state to the solid state can be reduced, nitrogen in the duplex stainless steel is prevented from being separated out in the solidification process, and the defect of the duplex stainless steel bubbles is thoroughly eliminated.

Description

Technical field [0001] The invention belongs to the technical field of continuous casting, and relates to a method for eliminating the bubbles of duplex stainless steel, and in particular to a method for eliminating bubbles of duplex stainless steel and the duplex stainless steel prepared by the method. Background technique [0002] The nitrogen element in stainless steel can form and expand the austenite phase region, which can replace part of the metallic nickel. Therefore, the low-cost duplex stainless steel that replaces nickel with nitrogen has become the focus of research in the industry. Duplex stainless steel is more and more favored by users because of its many advantages such as long service life, high strength, light weight, good welding performance, corrosion resistance and environmental protection. The main varieties include S32205, S32101, S32750, S32304, etc. The products have been widely used in major projects in the defense, aerospace, petrochemical, shipbuildin...

Claims

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Application Information

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IPC IPC(8): B22D11/18B22D11/20
CPCB22D11/002B22D11/181B22D11/183B22D11/203
Inventor 周丰张增武陈法涛张卫红孙仁宝
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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