Control method for inclusions in high-titanium steel, high-titanium steel and preparation method of high-titanium steel

A control method and inclusion technology, applied in the field of iron and steel smelting, can solve the problems of effective removal of unfavorable titanium-containing large inclusions, easy accumulation of large inclusions, limited refining time, etc., to avoid nozzle nodules, improve yield, The effect of improving production efficiency

Active Publication Date: 2022-04-22
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under high titanium content, titanium oxide and TiN inclusions are easy to form in the steel, which has the characteristics of high melting point and easy aggregation, which will cause nodules in the continuous casting nozzle, crystallizer "fishing" and large inclusions in the billet, and eventually lead to cold plate Surface defects and profile flaw detection failures
[0003] The existing titanium-containing steel smelting technologies such as CN201910878406.2, CN201911109355.3, CN201410127821.1, CN201510619738.0, etc., use LF or VOD for deoxidation and titanium alloying. Due to the limited refining time, it is not conducive to the effective removal of large titanium-containing inclusions. remove
[0004] The existing technology is mainly aimed at steel types with low titanium content. TiN is precipitated during the continuous casting solidification process, which will not cause production quality problems; when the titanium content is high, the TiN product increases, and the molten steel will precipitate TiN at the smelting temperature. Easily aggregate to form large inclusions

Method used

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  • Control method for inclusions in high-titanium steel, high-titanium steel and preparation method of high-titanium steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] ⅠAfter the blowing of AOD, silicon-aluminum composite deoxidation is used first, and the Al content is controlled at 0.005wt%;

[0062] Ⅱ Dump the furnace body, remove more than 90% of the slag, and keep the bottom blowing argon protection during the process;

[0063] ⅢAdd 3kg of aluminum shot per ton of steel, 10kg of lime per ton of steel, 8kg of fluorite per ton of steel, and the flow rate of bottom blowing argon is 0.4Nm per ton of steel 3 / min stirring for 5min;

[0064] IVAOD adds titanium alloy block for titanium alloying. The composition of titanium alloy block is: Ti: 92%, Al: 7.8%, N: ≤0.01%, O: ≤0.01%, and the rest are unavoidable impurities; after titanium alloying, continue to use Bottom blowing argon gas flow rate is 0.4Nm per ton of steel 3 / min Stir for 3min;

[0065] Ⅴ During the tapping process, AOD bottom blowing argon protection is maintained, the tapping speed is controlled at 3t / s, and attention is paid to keep the slag covering most of the molt...

Embodiment 2

[0069] ⅠAfter the blowing of AOD, silicon-aluminum composite deoxidation is used first, and the Al content is controlled at 0.015wt%;

[0070] Ⅱ Dump the furnace body, remove more than 90% of the slag, and keep the bottom blowing argon protection during the process;

[0071] ⅢAdd 4kg of aluminum shot per ton of steel, 13kg of lime per ton of steel, 7kg of fluorite per ton of steel, and the flow rate of bottom blowing argon is 0.6Nm per ton of steel 3 / min stirring 6min;

[0072] IVAOD adds titanium alloy block for titanium alloying. The composition of titanium alloy block is: Ti: 92%, Al: 7.8%, N: ≤0.01%, O: ≤0.01%, and the rest are unavoidable impurities; after titanium alloying, continue to use Bottom blowing argon gas flow is 0.6Nm per ton of steel 3 / min stirring for 5min;

[0073] Ⅴ During the tapping process, AOD bottom blowing argon protection is maintained, the tapping speed is controlled according to 6t / s, and attention is paid to keep the slag covering most of the...

Embodiment 3

[0077] Ⅰ After the blowing of AOD, silicon-aluminum composite deoxidation is used first, and the Al content is controlled at 0.008wt%;

[0078] Ⅱ Dump the furnace body, remove more than 90% of the slag, and keep the bottom blowing argon protection during the process;

[0079] Ⅲ Add 5kg of aluminum shot per ton of steel, 15kg of lime per ton of steel, 5kg of fluorite per ton of steel, and the flow rate of bottom blowing argon is 0.6Nm per ton of steel 3 / min stirring 8min;

[0080] IVAOD adds titanium alloy block for titanium alloying. The addition amount is calculated according to the yield of 65-80%. The composition of titanium alloy block is: Ti: 94%, Al: 5.9%, N: ≤0.01%, O: ≤0.01%, The rest are unavoidable impurities; after titanium alloying, continue to use bottom blowing argon flow rate of 0.6Nm per ton of steel 3 / min stirring for 5min;

[0081] Ⅴ During the tapping process, AOD bottom blowing argon protection is maintained, the tapping speed is controlled according t...

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Abstract

The invention belongs to the technical field of iron and steel smelting, and relates to a control method of high-titanium steel inclusions, high-titanium steel and a preparation method of the high-titanium steel. The control method for the high-titanium steel inclusions comprises the steps that (1) after AOD blowing is finished, silicon-aluminum composite deoxidation is adopted; (2) aluminum shots, lime and fluorite are added into the molten steel after slagging-off, and argon is blown from the bottom for stirring; (3) titanium alloy blocks are added for titanium alloying, the adding amount of the titanium alloy blocks is calculated according to the yield of 65-80%, and argon bottom blowing continues after titanium alloying; (4) tapping and keeping argon oxygen decarburization (AOD) bottom blowing argon; and (5) after the component temperature of the molten steel and the components of the slag are adjusted through the LF, pure calcium wires or silicon-calcium blocks are fed. According to the control method for the high-titanium steel inclusions, the defects of nozzle nodulation, 'fish formation 'of a continuous casting crystallizer and inclusion on the surface of a product or failure in flaw detection caused by precipitation of a large amount of TiN are overcome.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and relates to a method for controlling inclusions in high-titanium steel, high-titanium steel and a preparation method thereof, in particular to a method for controlling high-titanium austenitic stainless steel and inclusions thereof. Background technique [0002] The titanium content in high-titanium austenitic stainless steel is usually greater than 0.3%, including 316Ti, high-titanium 321, iron-nickel-based alloys, etc. Under high titanium content, titanium oxide and TiN inclusions are easy to form in the steel, which has the characteristics of high melting point and easy aggregation, which will cause nodules in the continuous casting nozzle, "fishing" in the crystallizer, and large inclusions in the billet, and eventually lead to cold plate Surface defects and profile flaw detection are inconsistent. [0003] The existing titanium-containing steel smelting technologies such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/06C22C14/00C22C33/06
CPCC21C7/06C21C7/0006C22C14/00C22C33/06Y02P10/20
Inventor 翟俊郎炜昀庄迎
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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