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Method for smelting titanium-containing ferritic stainless steel through hot-metal bottle dephosphorization, finery and argon flushing station

A stainless steel and refining furnace technology, which is used in refining furnaces and argon blowing stations to smelt titanium-containing ferritic stainless steel, and the field of dephosphorization of molten iron tanks, can solve the problems of polluted molten steel, molten steel exposure, molten steel boiling, etc. The effect of reducing smelting cost and preventing nozzle blockage

Inactive Publication Date: 2017-01-04
SHANDONG TAISHAN STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of using the above process are: using electric furnace or converter to smelt semi-steel, high smelting cost, high requirements for process treatment, low carbon content of semi-steel, easy to cause insufficient heat in subsequent processes; using LF to treat molten steel is easy to increase carbon, nitrogen, and pollute molten steel ;Calcium treatment by directly adding ferro-titanium and wire feeding is likely to cause boiling of molten steel, low metal recovery rate, serious erosion of ladle, exposure of molten steel, contamination of molten steel, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Implement the invention within the company. To produce a titanium-containing ferritic stainless steel, the mass fraction ratio of molten steel is controlled as follows: C: ≤0.012%, Si: 0.35%, Mn: ≤0.80%, P: ≤0.030%, S: ≤0.010%, Cr: 11.0%, Ti: ≥8(C+N)%, N: ≤0.012%, and the rest are Fe and unavoidable impurities.

[0021] As mentioned above, the smelting steps of the titanium-containing ferritic stainless steel are as follows:

[0022] (1) Dephosphorization of hot metal tanks:

[0023] Dephosphorization of molten iron in molten iron tanks, dephosphorization by blowing method, top blowing oxygen flow rate 26 Nm 3 / min, the gun position is 1.0m, the flow rate of lime powder sprayed by the dusting gun is 20kg / min, the gun position is 500mm from the bottom of the tank, 0.20kg of iron oxide scale is added per ton of molten iron, blowing is started for 20 minutes, slag removal and sampling, desiliconization to Si content Then enter the dephosphorization period, add 100kg of ...

Embodiment 2

[0032] Implement the invention within the company. To produce a titanium-containing ferritic stainless steel, the mass fraction ratio of molten steel is controlled as follows: C: ≤0.012%, Si: 0.55, Mn: ≤0.80%, P: ≤0.030%, S: ≤0.010%, Cr: 11.75 %%, Ti: ≥8(C+N)%, N: ≤0.012%, the rest is Fe and unavoidable impurities.

[0033] As mentioned above, the smelting steps of the titanium-containing ferritic stainless steel are as follows:

[0034] (1) Dephosphorization of hot metal tanks:

[0035] Dephosphorization of molten iron in molten iron tanks, dephosphorization by blowing method, top blowing oxygen flow rate 20 Nm 3 / min, the gun position is 0.7m, the flow rate of lime powder sprayed by the dusting gun is 50kg / min, the distance between the gun position and the bottom of the tank is 495mm, 0.10kg of iron oxide scale is added per ton of molten iron, blowing is started for 30 minutes, slag is removed and sampled, and silicon is desiliconized to Si: 0.06%, then enter the dephosph...

Embodiment 3

[0044] Implement the invention within the company. To produce a titanium-containing ferritic stainless steel, the mass fraction ratio of molten steel is controlled as follows: C: ≤0.012%, Si: 0.50, Mn: ≤0.80%, P: ≤0.030%, S: ≤0.010%, Cr: 11.50 %, Ti: ≥8(C+N)%, N: ≤0.012%, the rest is Fe and unavoidable impurities.

[0045] As mentioned above, the smelting steps of the titanium-containing ferritic stainless steel are as follows:

[0046] (1) Dephosphorization of hot metal tanks:

[0047] Dephosphorization of molten iron in molten iron tanks, dephosphorization by blowing method, top blowing oxygen flow rate 25Nm 3 / min, the gun position is 0.8m, the flow rate of lime powder sprayed by the dusting gun is 30 kg / min, the gun position is 500mm from the bottom of the tank, 0.15kg of iron oxide scale is added per ton of molten iron, blowing is started for 25 minutes, slag is removed and sampled, and silicon is desiliconized to Si : 0.09%, enter the dephosphorization period, add 150...

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PUM

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Abstract

The invention discloses a method for smelting titanium-containing ferritic stainless steel through a hot-metal bottle for dephosphorization, a finery and an argon flushing station. The method is characterized in that molten steel is composed of, by mass, less than or equal to 0.012% of C, 0.35-0.55% of Si, less than or equal to 0.80% of Mn, less than or equal to 0.030% of P, 0.010% of S, 11.0-11.75% of Cr, less than or equal to 0.012% of N, and the balance Fe and inevitable impurities, wherein the content of Ti is greater than 8*(C+N)%. According to the method, due to the fact that hot-metal bottle dephosphorization, the stainless steel finery and the argon flushing station are adopted for smelting, the situation that the probability of recarburization and nitrogen increase is increased due to electrode power transmission is avoided, the content of (C+N) of finished products is less than or equal to 150*10<-6>; and meanwhile, an adding method special for ferrotitanium and calcium-silicon, the alloy recovery rate is increased, the purity degree of the molten steel is ensured, a nozzle is prevented from being blocked in the continuous casting process, smooth production is ensured, and the smelting cost is reduced.

Description

technical field [0001] The invention relates to an improvement of a production method of titanium-containing ferritic stainless steel, in particular to a method for dephosphorizing iron ladles, refining furnaces and argon blowing stations to smelt titanium-containing ferritic stainless steel. Background technique [0002] Ferritic stainless steel is a stainless steel with a body-centered cubic structure, a carbon content of ≤0.20%, a chromium content of 10.5% to 32%, and a ferritic structure at high temperature and room temperature. Research in the 1960s showed that the defects of ferrite are caused by interstitial elements carbon and nitrogen, so reducing carbon and nitrogen in molten steel can significantly improve the comprehensive performance of ferritic stainless steel. Therefore, ultra-low carbon nitrogen ferritic stainless steel has become the development direction of modern ferritic stainless steel. The general requirements of ultra-low carbon nitrogen ferritic stain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C38/02C22C38/04C21C1/02C21C7/06C21C7/072C21C7/00
CPCC22C38/28C21C1/02C21C7/0006C21C7/0685C21C7/072C22C38/001C22C38/02C22C38/04
Inventor 王永胜邵书东陈茂宝赵刚殷齐敏徐光富亓传军胡自明颜凯焦玉水魏述一李江江李峰史秀宝
Owner SHANDONG TAISHAN STEEL GROUP
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