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A Method for Eliminating Bubbles in Duplex Stainless Steel

A technology of duplex stainless steel and stainless steel, which is applied in the field of eliminating bubbles of duplex stainless steel and duplex stainless steel. It can solve the problems of affecting the quality of duplex stainless steel, defects of bubbles in billet, and easy precipitation of gas, etc., and achieves the effect of eliminating bubble defects and suppressing nitrogen. Precipitation, the effect of reducing temperature drop

Active Publication Date: 2022-02-25
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 type in this example is duplex stainless steel S32205, and the cross-section of the continuous casting slab is 200×2000mm 2 , mass percentage of chemical composition of 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 is Fe and unavoidable impurities.

[0042] The implementation steps are as follows:

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

[0044] (2) The first furnace of 316L ladle casting 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 casting speed is reduced from 0.9m / min to 0.4m / min; the molten steel in the tundish is poured to 8t , the casting speed decreased from 0.4m / min to 0.1m / min; when the molten steel in the tundish was poured to 5t, t...

Embodiment 2

[0049] The steel type in this example is duplex stainless steel S32101, and the cross-section of the continuous casting slab is 200×1300mm 2 , mass percentage of chemical composition of 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) A tundish with 3 furnaces of continuous pouring of steel, the first furnace of stainless steel 301L, the second and third furnaces of duplex stainless steel S32101.

[0055] (2) After the casting of the first furnace 301L ladle is completed, the molten steel in the tundish continues to be cast. When the casting speed reaches 8t, the continuous casting speed drops from 0.4m / min to 0.1m / min; when the tundish molten steel is poured to 5t, the continuous casting of the second furnace of S32101 steel begins; the continuous casting...

Embodiment 3

[0060] The steel type in this example is duplex stainless steel S32205, and the cross-section of the continuous casting slab is 200×2000mm 2 , mass percentage of chemical composition of 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 is Fe and unavoidable impurities.

[0063] The implementation steps are as follows:

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

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

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Abstract

The invention belongs to the technical field of continuous casting and relates to a method for eliminating bubbles in duplex stainless steel. Continuous casting, and finally the transition blank when the non-duplex stainless steel and the duplex stainless steel are connected is cut off. The method for eliminating bubbles in duplex stainless steel of the present invention can reduce the temperature drop of duplex stainless steel molten steel from liquid to solid state, inhibit the precipitation of nitrogen in the steel during the solidification process of duplex stainless steel, and completely eliminate bubble defects in duplex stainless steel plates.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and relates to a method for eliminating bubbles in duplex stainless steel, in particular to a method for eliminating bubbles in duplex stainless steel and duplex stainless steel prepared by the method. Background technique [0002] Nitrogen in stainless steel can form and expand the austenite phase region, which can replace part of the nickel metal. Therefore, the low-cost duplex stainless steel with nickel replaced by nitrogen has become the focus of research in the industry. Duplex stainless steel is more and more favored by users because of its 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 industries such as national defense, aerospace, petrochemical, shipbuilding and seawater systems. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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