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Ferro-titanium alloying method for titaniferous stainless steel

A titanium-iron alloy and stainless steel technology is applied in the field of titanium-iron-titanium alloying of titanium-containing stainless steel, which can solve the problems of continuous casting mold nozzle blockage, many titanium wires, and long occupation time, so as to reduce the smelting time, improve the yield rate, and solve the blocking effect

Active Publication Date: 2012-05-23
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the stainless steel production line of the applicant's second steelmaking plant was put into production in September 2006, the output of titanium-containing stainless steel 321, 316Ti, 409L and other steels increased, and titanium alloying was carried out by feeding titanium wires in the LF furnace. A large amount of water needs to be fed with more titanium wires, which takes a long time and seriously affects the normal production order. Using ferro-titanium for direct alloying, the purity of molten steel is not good, resulting in blockage of the nozzle of the continuous casting mold and crusting of mold slag and other issues that affect production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The type of steel smelted in this embodiment is 321 (0Cr18Ni10Ti), the capacity of the LF refining furnace is 180 tons, and 175 tons of molten steel is processed. There are two bottom blowing pipes, and the slag thickness after the molten steel reaches the LF refining furnace is 50 mm. The mass percentage ratio of the ingredients is:

[0020] C≤0.08; Si≤1.00; Mn≤2.00; Cr 17.00-19.00;

[0021] Ni 9.00-12.00; Ti≥5C; P≤0.035; S≤0.030.

[0022] The applicant controls the mass percentage ratio of the components of the steel grade to:

[0023] C≤0.04; Si 0.40-0.70; Mn 0.80-1.50; Cr 17.00-18.00;

[0024] Ni 9.00-9.50; Ti 5C-0.25; P≤0.035; S≤0.010.

[0025] The rest is Fe and unavoidable impurities.

[0026] The embodiment of this ferro-titanium alloying method for titanium-containing stainless steel is the following steps in sequence:

[0027] I slag removal

[0028] After AOD tapping, remove the slag in the ladle at 01:00:00, and the thickness of the remaining slag is 5...

Embodiment 2

[0042] The steel type smelted in this embodiment is 316Ti, the capacity of the LF refining furnace is 180 tons, and 179 tons of molten steel is processed. There are two bottom blowing pipes, and the slag thickness after the molten steel reaches the LF refining furnace is 50 mm. The mass percentage ratio is:

[0043] C≤0.08; Si≤0.75; Mn≤2.00; Cr 16.50-18.50;

[0044] Ni 10.50-13.50; Ti≥5×C+N)-0.70; P≤0.045; S≤0.015.

[0045] The applicant controls the mass percentage ratio of the components of the steel grade to:

[0046] C≤0.04; Si 0.30-0.70; Mn 0.80-1.50; Cr 16.50-17.00;

[0047] Ni 10.50-11.00; Ti 5×C+N); P≤0.045 S≤0.010 N≤0.020

[0048] The rest is Fe and unavoidable impurities.

[0049] The embodiment of this ferro-titanium alloying method for titanium-containing stainless steel is the following steps in sequence:

[0050] I slag removal

[0051] After AOD tapping, remove the slag in the ladle at 03:20:00, and the thickness of the remaining slag is 50mm;

[0052] II...

Embodiment 3

[0065] The steel type smelted in this embodiment is 409L, the capacity of the LF refining furnace is 180 tons, and the molten steel is processed to 170.2 tons. There are two bottom blowing pipes, and the slag thickness after the molten steel reaches the LF refining furnace is 50 mm. The mass percentage ratio is:

[0066] C≤0.03; Si≤1.00; Mn≤1.00; Cr 10.50-11.75; Ni≤0.60

[0067] Ti≥6C-0.75; P≤0.035 S≤0.030; N≤0.030.

[0068] The applicant controls the mass percentage ratio of the components of the steel grade to:

[0069] C≤0.012; Si≤0.75; Mn≤0.80; Cr 11.00-11.75;

[0070] Ni≤0.30; Ti 10×C-0.15; P≤0.035 S≤0.010 N≤0.020

[0071] Nb 0.15-0.20;

[0072] The rest is Fe and unavoidable impurities.

[0073] The embodiment of this ferro-titanium alloying method for titanium-containing stainless steel is the following steps in sequence:

[0074] I slag removal

[0075] After AOD tapping, remove the slag in the ladle at 20:20:00, and the thickness of the remaining slag is 50mm; ...

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Abstract

The invention relates to a ferro-titanium alloying method for titaniferous stainless steel, which comprises the following steps of: I) after slagging off and AOD (Argon Oxygen Decarburization) tapping, removing slag and keeping the thickness of the remained slag being not more than 50mm; II) making a slag steel bag again and hanging in an LF (Low Frequency) finery, adding lime and fluorite for making the slag again, blowing argon from bottom and powerfully stirring and slagging or electrifying and slagging; III) deoxidizing, adding aluminum powder in surface slag, keeping total bottom blowingflow being 600-1,000Nl / min, and stirring for 3-5min; IV) before discharging molten steel, starting to feed a silico-calcium line, and then softly stirring; and V) adding ferro-titanium for alloying, keeping the bottom blowing argon flow close to the side of a feeding port being 500-700 Nl / min and the one away from the side of the feeding port being 100-200Nl / min, adding 2.5-3.5kg ferro-titanium in a ton of molten steel, keeping the bottom blowing flow being 200-300 Nl / min per piece and stirring, and then adjusting the total flow of bottom blowing double-tube being not more than 200NL / min, andsoftly stirring. According to the ferro-titanium alloying method for titaniferous stainless steel, the titanium-feeding time is short and a crystallizer water port is prevented from being plugged during a continuous casting process.

Description

technical field [0001] The invention relates to a ferro-titanium alloying method for titanium-containing stainless steel. Background technique [0002] After the stainless steel production line of the applicant's second steelmaking plant was put into production in September 2006, the output of titanium-containing stainless steel 321, 316Ti, 409L and other steels increased, and titanium alloying was carried out by feeding titanium wires in the LF furnace. A large amount of water needs to be fed with more titanium wires, which takes a long time and seriously affects the normal production order. Using ferro-titanium for direct alloying, the purity of molten steel is not good, resulting in blockage of the nozzle of the continuous casting mold and encrustation of mold slag And other problems, affecting the production. Contents of the invention [0003] In order to overcome the above-mentioned shortcomings of the existing titanium-containing stainless steel ferro-titanium alloy...

Claims

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Application Information

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IPC IPC(8): C22C33/06C22C38/50C21C7/00
Inventor 常国栋李建民陈景锋刘卫东
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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