CN103469104A - Boron-containing double phase stainless steel and boron alloyage smelting method thereof - Google Patents

Boron-containing double phase stainless steel and boron alloyage smelting method thereof Download PDF

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CN103469104A
CN103469104A CN2013103552771A CN201310355277A CN103469104A CN 103469104 A CN103469104 A CN 103469104A CN 2013103552771 A CN2013103552771 A CN 2013103552771A CN 201310355277 A CN201310355277 A CN 201310355277A CN 103469104 A CN103469104 A CN 103469104A
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boron
steel
molten steel
stainless steel
duplex stainless
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CN103469104B (en
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陈兴润
潘吉祥
王建新
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Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
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Gansu Jiu Steel Group Hongxing Iron and Steel Co Ltd
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Abstract

The invention discloses a boron-containing double phase stainless steel and a smelting method thereof. The boron-containing double phase stainless steel comprises, by mass, 0.018-0.025% of C, 0.48-0.54% of Si, 1.15-1.20% of Mn, 0.025% or less of P, 0.0005% or less of S, 22.20-22.30% of Cr, 5.20-5.25% of Ni, 3.08-3.12% of Mno, 0.174-0.184% of N, 0.0028-0.0035% of B, and the balance Fe and residual elements. The boron alloyage smelting method of the boron-containing double phase stainless steel comprises the steps of AOD refining, slag removal after AOD tapping, LF refining and continuous casting, wherein borax is added in the LF refining process. The smelting method, which allows the borax to be added on the premise that the total oxygen content in steel is reduced, guarantees the stable obtaining of a proper amount of acid-soluble boron. The added borax is a slagging agent containing acidic oxide B2O3, and has a wide source and a low price. A production technology is simple, and the borax can also be used as a slag modifier to realize boron alloyage.

Description

A kind of boracic duplex stainless steel and boron alloy smelting process thereof
Technical field
The invention belongs to the stainless steel smelting technical field, relate in particular to a kind of boracic duplex stainless steel and boron alloy smelting process thereof.
Background technology
Boron is the interstitial atom that atomic radius is very little, and boron, in the segregation of duplex stainless steel crystal boundary, can improve the intensity of crystal boundary, improves hot workability.In addition, adding of boron can provide more nucleation site in the molten steel solidification process, thereby improves the equiaxial crystal ratio of two-phase stainless plate slab.But too much boron adds, easily at crystal boundary, form the precipitated phase of low melting point, worsen hot workability.Therefore, in the process of producing duplex stainless steel, adding appropriate B is useful to the hot workability of steel.
While adopting AOD converter smelting → LF refinery practice to produce duplex stainless steel, conventional method is in AOD tapping process or LF refining process, to add ferro-boron or boron line to complete the alloying of boron.
Patent " a kind of duplex stainless steel and manufacture method thereof " (patent No. ZL200810079771.9, publication number CN101403077, day for announcing 2009.04.08) a kind of duplex stainless steel and manufacture method thereof are disclosed, when AOD taps, molten steel is poured in baked ladle, tap reaches 1/3 o'clock of total molten steel amount, disposablely in ladle, adds ferro-boron 0.4～0.5kg/t.
Patent " a kind of duplex stainless steel and manufacture method thereof " (patent No. ZL200910046646.2, notification number CN101812647A, day for announcing 2010.08.25) disclose a kind of duplex stainless steel and manufacture method thereof, added 0～0.003% B in the mode of feeding silk in ladle or crystallizer.
The technique of existing boron alloy smelting boracic duplex stainless steel, deficiency be ferro-boron and boron line cost higher, ferro-boron line complicated operation in the process that ladle or crystallizer add simultaneously, easily break, total oxygen content in steel directly affects the rate of recovery of boron in addition, oxygen causes the oxidation of [B], reduces the content of sour molten boron in molten steel.Therefore, be necessary to develop that a kind of easy, starting material wide material sources, production cost are low, the method for the boron alloy smelting boracic duplex stainless steel of boron stable content.
Summary of the invention
The object of the present invention is to provide a kind of boracic duplex stainless steel.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of boracic duplex stainless steel, according to the mass percent meter, chemical composition is, C:0.018～0.025%, Si:0.48～0.54%, Mn:1.15～1.20%, P≤0.025%, S≤0.0005%, Cr:22.20～22.30%, Ni:5.20～5.25%, Mo:3.08～3.12%, N:0.174～0.184%, B:0.0028～0.0035%, other is Fe and relict element.
According to the mass percent meter, the chemical composition of described boracic duplex stainless steel is, C:0.018%, Si:0.48%, Mn:1.18%, P:0.025%, S:0.0003%, Cr:22.27%, Ni:5.25%, Mo:3.10%, N:0.184%, B:0.0035%, other is Fe and relict element.
According to the mass percent meter, the chemical composition of described boracic duplex stainless steel is, C:0.025%, Si:0.50%, Mn:1.15%, P:0.022%, S:0.0005%, Cr:22.30%, Ni:5.20%, Mo:3.12%, N:0.178%, B:0.0028%, other is Fe and relict element.
According to the mass percent meter, the chemical composition of described boracic duplex stainless steel is, C:0.020%, Si:0.54%, Mn:1.20%, P:0.024%, S:0.0004%, Cr:22.20%, Ni:5.24%, Mo:3.08%, N:0.174%, B:0.0030%, other is Fe and relict element.
Another object of the present invention be to provide technique simple, be easy to operate and control, production cost is low, the boron alloy smelting process of a kind of boracic duplex stainless steel of boron stable content.
For achieving the above object, the technical scheme that the present invention takes is:
The boron alloy smelting process of described boracic duplex stainless steel comprises the following steps:
Step 1, AOD refining: at 1500～1540 ℃, according to the mass percent meter, by chemical composition, be: C:1.70～2.20%, Si:0.10～0.26%, Mn:0.25～0.35%, P≤0.024%, S≤0.03%, Cr:17.80～18.20%, Ni:5.00～5.40%, B:0.0004～0.0006%, other molten iron for Fe and relict element is injected in the AOD stove, carries out decarburization, reduction, desulphurization reaction;
Step 2, skim after the AOD tapping: molten steel is poured in baked ladle into to ladle baking to 700～900 ℃ from the AOD stove at 1650 ℃～1700 ℃; Ladle is transported to the station of skimming, and the processing of being skimmed, stay the thick 150～200mm of being of quantity of slag slag;
Step 3, the LF refining: ladle is transported to the LF stove and carry out refining, inlet temperature is 1580 ℃～1600 ℃; Carry out the Argon operation after entering the station, argon flow amount is controlled at 300～500NL/min;
1. feed aluminum steel and adjust total oxygen content≤0.002% in molten steel, the aluminum steel feed quantity is 1.0～1.5 meters/t molten steel;
2. add slag material: aluminum shot, lime and fluorite add borax simultaneously; The aluminum shot add-on is 0.2～0.3kg/t molten steel, and lime adding amount is 5.0～7.0kg/t molten steel, and the fluorite add-on is 3.0～5.0kg/t molten steel, and the borax add-on is 0.694kg～0.844kg/t molten steel;
3. adopt Graphite Electrodes energisingization slag, after slag charge melts fully, use strong bottom blowing to stir 10～20 minutes, argon flow amount is controlled at 700～800NL/min; Under the effect of stirring at argon gas, boron enters into molten steel by diffusion from slag, with the form of the molten boron of acid, exists;
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, adjust Mo, Si, Mn, Cr, Ni composition in molten steel, adjusts liquid steel temperature to 1520～1525 ℃;
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, the silicon-calcium wire feed quantity is 7.0～8.0 meters/t molten steel; Adjust argon flow amount, a little less than blow 12～20 minutes, the argon bottom-blowing flow is 100～200 NL/min; The chemical composition that obtains molten steel is, C:0.018～0.025%, Si:0.48～0.54%, Mn:1.15～1.20%, P≤0.025%, S≤0.0005%, Cr:22.20～22.30%, Ni:5.20～5.25%, Mo:3.08～3.12%, N:0.174～0.184%, B:0.0028～0.0035%, other is Fe and relict element;
Step 4, continuous casting: molten steel is transported to continuous casting platform and is cast, obtain described boracic two-phase stainless product made from steel.
Adopt boracic duplex stainless steel provided by the invention and smelting process thereof, the borax of interpolation is for containing acidic oxide B 2o 3slag former, borax wide material sources, aboundresources, low price; Production technique is simple and easy, and borax, except can be used as the modification agent of slag, also completes the alloying of boron, can guarantee stably to obtain the molten boron of appropriate acid in the smelting of boracic duplex stainless steel, can significantly reduce fusing point and the viscosity of slag.This smelting process adds borax under the prerequisite that reduces entire oxygen content in the steel content, guarantees the stable appropriate molten boron of acid that obtains.
The accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
The metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates that Fig. 2 is the embodiment of the present invention 1 production.
Fig. 3 adopts the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates of boron line production with embodiment 1 the same terms.
The metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates that Fig. 4 is the embodiment of the present invention 2 productions.
Fig. 5 adopts the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates of boron line production with embodiment 2 the same terms.
The metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates that Fig. 6 is the embodiment of the present invention 3 productions.
Fig. 7 adopts the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates of boron line production with embodiment 3 the same terms.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing thereof, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
A kind of boracic duplex stainless steel provided by the invention, according to the mass percent meter, chemical composition is, C:0.018～0.025%, Si:0.48～0.54%, Mn:1.15～1.20%, P≤0.025%, S≤0.0005%, Cr:22.20～22.30%, Ni:5.20～5.25%, Mo:3.08～3.12%, N:0.174～0.184%, B:0.0028～0.0035%, other is Fe and relict element.
As shown in Figure 1, be the production scheme of this boracic duplex stainless steel.
Embodiment 1
Steel grade 2205 duplex stainless steels, according to the mass percent meter, its chemical composition is, C:0.018%, Si:0.48%, Mn:1.18%, P:0.025%, S:0.0003%, Cr:22.27%, Ni:5.25%, Mo:3.10%, N:0.184%, B:0.0035%, other is Fe and relict element.
The boron alloy smelting process of this boracic duplex stainless steel comprises the following steps:
1.AOD refining: at 1530 ℃, according to the mass percent meter, by chemical composition, be: C:1.70%, Si:0.15%, Mn:0.25%, P:0.024%, S:0.03%, Cr:17.95%, Ni:5.40%, B:0.0005%, 92.4 tons of molten iron that other is Fe and relict element are injected in the AOD stove, carry out decarburization, reduction, desulphurization reaction.
1. decarburization: top and bottom complex blowing oxygen carries out decarburization, and for adding fast response, bottom blowing nitrogen is stirred.Add the lime of 70kg/t molten steel and the high carbon ferro-chrome of 110.2kg/t molten steel in carbon rejection process.Add altogether lime 70 * 106.6=7462kg, high carbon ferro-chrome 110.2 * 106.6=11750kg.
When carbon content is less than 0.01%, reduced, the operation of desulfurization.
2. reduction: add the ferro-silicon of 16.0kg/t molten steel, the silicomanganese of 16.0kg/t molten steel and the aluminium block of 6.5kg/t molten steel in the AOD stove, oxidized Cr in reduced blast furnace 2o 3.At utmost deslagging after this stage finishes.
Add altogether ferro-silicon 16 * 106.6=1705.6kg, silicomanganese 16 * 106.6=1705.6kg, aluminium block 6.5 * 106.6=692.9kg.
The ferrosilicon composition range is, Si:72～80%, S≤0.030%, P≤0.040%.The silicomanganese composition range is, Si:20～25%, Mn:60～65%, P≤0.040%, S≤0.030%.The composition of aluminium block is: 99.5%Al, 0.4%Fe.
3. desulfurization: add the lime of 10.0kg/t molten steel, making the basicity of slag in the AOD converter is 2.3, makes AOD tapping sulphur content be less than 0.001%; Add altogether lime 10 * 106.6=1066Kg.
2.AOD skim after tapping: the 106.6t molten steel is poured in baked ladle into to ladle baking to 800 ℃ from the AOD stove at 1650 ℃; Ladle is transported to the station of skimming, the processing of being skimmed, staying quantity of slag slag thick is 200mm;
3. LF refining: ladle is transported to the LF stove and carry out refining, inlet temperature is 1580 ℃.Carry out the Argon operation after entering the station, argon flow amount is controlled at 500NL/min.
1. feed aluminum steel and adjust total oxygen content to 0.0020% in molten steel, the aluminum steel feed quantity is 1.0 meters/t molten steel; 1.0 * 106.6=106.6 rice; Aluminum steel weight is 0.3kg/ rice, and chemical composition is: 98%Al, 0.4%Fe.
2. add slag material: aluminum shot, lime and fluorite, add borax simultaneously, borax is as the steel slag modification agent.
The aluminum shot chemical composition is: 98%Al, 0.4%Fe.
Calcification studies and is divided into: CaO >=88.0%, and P≤0.01%, S≤0.045%, C is solid≤and 0.7%, SiO2≤3.0%, activity degree >=350ml, give birth to burning≤7.0%, granularity: 10～100mm >=90%.
The chemical composition of fluorite is: CaF 2>=75.0%, SiO 2>=9.0%, P≤0.01%, S≤0.045%, C gu≤ 0.3%, granularity: 10～100mm>=90%.
Borax (Na 2b 40 710H 2o) as molten steel boron alloy raw material, on chemical constitution, be the sodium tetraborate that contains 10 water moleculess, 320 ℃ lose whole crystal water, and proportion 1.73 contains acidic oxide B in melt 2o 3.The borax added is for containing acidic oxide B 2o 3slag former, can significantly reduce fusing point and the viscosity of slag, be conducive to the floating of inclusion.
The aluminum shot add-on is the 0.3kg/t molten steel, and lime adding amount is the 7.0kg/t molten steel, and the fluorite add-on is the 4.0kg/t molten steel, and the borax add-on is the 0.844kg/t molten steel.
Add altogether aluminum shot 0.3 * 106.6=31.98kg, lime 7.0 * 106.6=746.2kg, fluorite 4.0 * 106.6=426.4kg, borax 0.844 * 106.6=90kg.
3. adopt Graphite Electrodes energisingization slag, after slag charge melts fully, use strong bottom blowing to stir 20 minutes, argon flow amount is controlled at 800NL/min.Under the effect of stirring at argon gas, boron enters into molten steel by diffusion from slag, with the form of the molten boron of acid, exists.
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, adjust Mo, Si, Mn, Cr, Ni composition in molten steel, adjusts liquid steel temperature to 1525 ℃.
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, the silicon-calcium wire feed quantity is 8.0 meters/t molten steel; Silicon-calcium wire weight is 0.25kg/ rice, and chemical composition is, Si:55～60%, Ca >=28%, P≤0.04%, S≤0.04%; Feed altogether 8.0 * 106.6=852.8 rice silicon-calcium wire.
Adjust argon flow amount, a little less than blow 20 minutes, the argon bottom-blowing flow is 100NL/min; Obtain the satisfactory molten steel of chemical composition.
Get the molten steel sample preparation, adopt the direct reading spectrometry detection method, according to the mass percent meter, the chemical composition that sample detected is: C:0.018%, Si:0.48%, Mn:1.18%, P:0.025%, S:0.0003%, Cr:22.27%, Ni:5.25%, Mo:3.10%, N:0.184%, B:0.0035%, other is Fe and relict element.
4. continuous casting: molten steel is transported to continuous casting platform and is cast, obtain boracic two-phase stainless product made from steel.
From the detection data of direct-reading spectrometer, can find out, in product, boron meets the target boron content requirement, illustrates and adopts borax to reach to adopt boron level in the product that ferro-boron or boron line produce.
The metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates that Fig. 2 is the embodiment of the present invention 1 production.
Fig. 3 adopts the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates of boron line production with embodiment 1 the same terms.
Comparison diagram 2 and Fig. 3, can find out: in the stainless steel NO.1 sheet metal phase constitution of producing with borax and boron line, do not have crackle.
Embodiment 2
Steel grade 2205 duplex stainless steels, according to the mass percent meter, its chemical composition is, C:0.025%, Si:0.50%, Mn:1.15%, P:0.022%, S:0.0005%, Cr:22.30%, Ni:5.20%, Mo:3.12%, N:0.178%, B:0.0028%, other is Fe and relict element.
The boron alloy smelting process of boracic duplex stainless steel comprises the following steps:
1. AOD refining: at 1540 ℃, according to the mass percent meter, by chemical composition, be: C:2.20%, Si:0.26%, Mn:0.35%, P:0.018%, S:0.013%, Cr:17.80%, Ni:5.00%, B:0.0004%, other 93.5 tons of molten iron for Fe and relict element are injected in the AOD stove, carry out decarburization, reduction, desulphurization reaction.
1. decarburization: top and bottom complex blowing oxygen carries out decarburization, and for adding fast response, bottom blowing nitrogen is stirred.Add the lime of 70kg/t molten steel and the high carbon ferro-chrome of 116.6kg/t molten steel in carbon rejection process.Add altogether lime 75 * 108.0=8100Kg, high carbon ferro-chrome 116.6 * 108.0=11592.8kg.
When carbon content is less than 0.01%, reduced, the operation of desulfurization.
2. reduction: add the ferro-silicon of 13.1kg/t molten steel, the silicomanganese of 14.3kg/t molten steel and the aluminium block of 7.1kg/t molten steel in the AOD stove, oxidized Cr in reduced blast furnace 2o 3.At utmost deslagging after this stage finishes.
Add altogether ferro-silicon 13.1 * 108.0=1414.8kg, silicomanganese 14.3 * 108.0=1544.4kg, aluminium block 7.1 * 108.0=766.8kg.
The ferrosilicon composition range is, Si:72～80%, S≤0.030%, P≤0.040%.The silicomanganese composition range is, Si:20～25%, Mn:60～65%, P≤0.040% S≤0.030%.The composition of aluminium block is: 99.5%Al, 0.4%Fe.
3. desulfurization: add the lime of 10.5kg/t molten steel, making the basicity of slag in the AOD converter is 2.3, makes AOD tapping sulphur content be less than 0.001%; Add altogether lime 10.5 * 108.0=1134kg.
2.AOD skim after tapping: the 108.0t molten steel is poured in baked ladle into to ladle baking to 700 ℃ from the AOD stove at 1700 ℃; Ladle is transported to the station of skimming, the processing of being skimmed, staying quantity of slag slag thick is 150mm.
3. LF refining: ladle is transported to the LF stove and carry out refining, inlet temperature is 1600 ℃; Carry out the Argon operation after entering the station, argon flow amount is controlled at 400NL/min.
1. feed aluminum steel and adjust entire oxygen content in the steel content to 0.0015%, the aluminum steel feed quantity is 1.5 meters/t molten steel; 1.5 * 108.0=162.0 rice; Aluminum steel weight is 0.3kg/ rice, and chemical composition is: 98%Al, 0.4%Fe.
2. add slag material: aluminum shot, lime and fluorite, add borax simultaneously, borax is as the steel slag modification agent.
The aluminum shot chemical composition is: 98%Al, 0.4%Fe.
Calcification studies and is divided into: CaO >=88.0%, and P≤0.01%, S≤0.045%, C is solid≤and 0.7%, SiO2≤3.0%, activity degree >=350ml, give birth to burning≤7.0%, granularity: 10～100mm >=90%.
The chemical composition of fluorite is: CaF 2>=75.0%, SiO 2>=9.0%, P≤0.01%, S≤0.045%, C gu≤ 0.3%, granularity: 10～100mm>=90%.
Borax (Na 2b 40 710H 2o) as molten steel boron alloy raw material, on chemical constitution, be the sodium tetraborate that contains 10 water moleculess, 320 ℃ lose whole crystal water, and proportion 1.73 contains acidic oxide B in melt 2o 3.The borax added is for containing acidic oxide B 2o 3slag former, can significantly reduce fusing point and the viscosity of slag, be conducive to the floating of inclusion.
The aluminum shot add-on is the 0.2kg/t molten steel, and lime adding amount is the 5.0kg/t molten steel, and the fluorite add-on is the 5.0kg/t molten steel, and the borax add-on is the 0.694kg/t molten steel.
Add altogether 0.2 * 108.0=21.6kg aluminum shot, 5.0 * 108.0=540.0kg lime, 5.0 * 108.0=540.0kg fluorite and 0.694 * 108.0=75kg borax.
3. adopt Graphite Electrodes energisingization slag, after slag charge melts fully, use strong bottom blowing to stir 10 minutes, argon flow amount is controlled at 700NL/min.Under the effect of stirring at argon gas, boron enters into molten steel by diffusion from slag, with the form of the molten boron of acid, exists.
4. thermometric sampling, according to result of laboratory test, adjust Mo in molten steel, Si, Mn, Cr, Ni composition by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, adjusts liquid steel temperature to 1520 ℃.
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, the silicon-calcium wire feed quantity is 7.0 meters/t molten steel; Silicon-calcium wire weight is 0.25kg/ rice, and chemical composition is, Si:55～60%, Ca >=28%, P≤0.04%, S≤0.04%; Feed altogether 7.0 * 108.0=756.0 rice silicon-calcium wire.
Adjust argon flow amount, a little less than blow 15 minutes, the argon bottom-blowing flow is 150NL/min; Obtain the satisfactory molten steel of chemical composition.
Get the molten steel sample preparation, adopt the direct reading spectrometry detection method, according to the mass percent meter, the chemical composition that sample detected is: C:0.025%, Si:0.50%, Mn:1.15%, P:0.022%, S:0.0005%, Cr:22.30%, Ni:5.20%, Mo:3.12%, N:0.178%, B:0.0028%, other is Fe and relict element.
4. continuous casting: molten steel is transported to continuous casting platform and is cast, obtain described boracic two-phase stainless product made from steel.
From the detection data of direct-reading spectrometer, can find out, in product, boron meets the target boron content requirement, illustrates and adopts borax to reach to adopt boron level in the product that ferro-boron or boron line produce.
The metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates that Fig. 4 is the embodiment of the present invention 2 productions.
Fig. 5 adopts the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates of boron line production with embodiment 2 the same terms.
Comparison diagram 4 and Fig. 5, can find out: in the stainless steel NO.1 sheet metal phase constitution of producing with borax and boron line, do not have crackle.
Embodiment 3
Steel grade 2205 duplex stainless steels, according to the mass percent meter, its chemical composition is, C:0.020%, Si:0.54%, Mn:1.20%, P:0.024%, S:0.0004%, Cr:22.20%, Ni:5.24%, Mo:3.08%, N:0.174%, B:0.0030%, other is Fe and relict element.
The boron alloy smelting process of boracic duplex stainless steel comprises the following steps:
1. AOD refining: at 1500 ℃, according to the mass percent meter, by chemical composition, be: C:1.93%, Si:0.10%, Mn:0.31%, P:0.021%, S:0.020%, Cr:18.20%, Ni:5.20%, B:0.0006%, 92.5 tons of molten iron that other is Fe and relict element are injected in the AOD stove, carry out decarburization, reduction, desulphurization reaction.
1. decarburization: top and bottom complex blowing oxygen carries out decarburization, and for adding fast response, bottom blowing nitrogen is stirred.Add the lime of 70kg/t molten steel and the high carbon ferro-chrome of 110.8kg/t molten steel in carbon rejection process.Add altogether lime 80 * 105.8=8464kg, high carbon ferro-chrome 110.8 * 105.8=11722.6kg.
When carbon content is less than 0.01%, reduced, the operation of desulfurization.
2. reduction: add the ferro-silicon of 13.4kg/t molten steel, the silicomanganese of 15.1kg/t molten steel and the aluminium block of 5.7kg/t molten steel in the AOD stove, oxidized Cr in reduced blast furnace 2o 3.At utmost deslagging after this stage finishes.
Add altogether ferro-silicon 13.4 * 105.8=1417.7kg, silicomanganese 15.1 * 105.8=1597.6kg, aluminium block 5.7 * 105.8=603.1kg.
The ferrosilicon composition range is, Si:72～80%, S≤0.030%, P≤0.040%.The silicomanganese composition range is, Si:20～25%, Mn:60～65%, P≤0.040%, S≤0.030%.The composition of aluminium block is: 99.5%Al, 0.4%Fe.
3. desulfurization: add the lime of 10.2kg/t molten steel, making the basicity of slag in the AOD converter is 2.3, makes AOD tapping sulphur content be less than 0.001%; Add altogether lime 10.2 * 105.8=1079.2kg.
2.AOD skim after tapping: the 105.8t molten steel is poured in baked ladle into to ladle baking to 900 ℃ from the AOD stove at 1665 ℃; Ladle is transported to the station of skimming, the processing of being skimmed, staying quantity of slag slag thick is 170mm.
3.LF refining: ladle is transported to the LF stove and carry out refining, inlet temperature is 1590 ℃; Carry out the Argon operation after entering the station, argon flow amount is controlled at 450NL/min.
1. feed aluminum steel and adjust entire oxygen content in the steel content to 0.0018%, the aluminum steel feed quantity is 1.2 meters/t molten steel; 1.2 * 105.8=126.96 rice; Aluminum steel weight is 0.3kg/ rice, and chemical composition is: 98%Al, 0.4%Fe.
2. add slag material: aluminum shot, lime and fluorite, add borax simultaneously, borax is as the steel slag modification agent,
The aluminum shot chemical composition is: 98%Al, 0.4%Fe.
Calcification studies and is divided into: CaO >=88.0%, and P≤0.01%, S≤0.045%, C is solid≤and 0.7%, SiO2≤3.0%, activity degree >=350ml, give birth to burning≤7.0%, granularity: 10～100mm >=90%.
The chemical composition of fluorite is: CaF 2>=75.0%, SiO 2>=9.0%, P≤0.01%, S≤0.045%, C gu≤ 0.3%, granularity: 10～100mm>=90%.
Borax (Na 2b 40 710H 2o) as molten steel boron alloy raw material, on chemical constitution, be the sodium tetraborate that contains 10 water moleculess, 320 ℃ lose whole crystal water, and proportion 1.73 contains acidic oxide B in melt 2o 3.The borax added is for containing acidic oxide B 2o 3slag former, can significantly reduce fusing point and the viscosity of slag, be conducive to the floating of inclusion.
The aluminum shot add-on is the 0.25kg/t molten steel, and lime adding amount is the 6.0kg/t molten steel, and the fluorite add-on is the 3.0kg/t molten steel, and the borax add-on is the 0.709kg/t molten steel.
Add altogether 0.25 * 105.8=26.45kg aluminum shot, 6.0 * 105.8=634.8kg lime, 3.0 * 105.8=317.4kg fluorite, 0.709 * 105.8=75kg borax.
3. adopt Graphite Electrodes energisingization slag, after slag charge melts fully, use strong bottom blowing to stir 15 minutes, argon flow amount is controlled at 750NL/min.Under the effect of stirring at argon gas, boron enters into molten steel by diffusion from slag, with the form of the molten boron of acid, exists.
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, adjust Mo, Si, Mn, Cr, Ni composition in molten steel, adjusts liquid steel temperature to 1523 ℃.
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, the silicon-calcium wire feed quantity is 7.5 meters/t molten steel; Silicon-calcium wire weight is 0.25kg/ rice, and chemical composition is, Si:55～60%, Ca >=28%, P≤0.04%, S≤0.04%; Feed altogether 7.5 * 105.8=793.5 rice silicon-calcium wire.
Adjust argon flow amount, a little less than blow 12 minutes, the argon bottom-blowing flow is 200 NL/min; Obtain the satisfactory molten steel of chemical composition.
Get the molten steel sample preparation, adopt the direct reading spectrometry detection method, according to the mass percent meter, the chemical composition that sample detected is: C:0.020%, Si:0.54%, Mn:1.20%, P:0.024%, S:0.0004%, Cr:22.20%, Ni:5.24%, Mo:3.08%, N:0.174%, B:0.0030%, other is Fe and relict element.
4. continuous casting: molten steel is transported to continuous casting platform and is cast, obtain described boracic two-phase stainless product made from steel.
From the detection data of direct-reading spectrometer, can find out, in product, boron meets the target boron content requirement, illustrates and adopts borax to reach to adopt boron level in the product that ferro-boron or boron line produce.
The metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates that Fig. 6 is the embodiment of the present invention 3 productions.
Fig. 7 adopts the metallographic structure photo of the steel grade 2205 duplex stainless steel NO.1 plates of boron line production with embodiment 3 the same terms.
Comparison diagram 6 and Fig. 7, can find out: in the stainless steel NO.1 sheet metal phase constitution of producing with borax and boron line, do not have crackle.

Claims (5)

1. a boracic duplex stainless steel, is characterized in that, according to the mass percent meter, chemical composition is, C:0.018～0.025%, Si:0.48～0.54%, Mn:1.15～1.20%, P≤0.025%, S≤0.0005%, Cr:22.20～22.30%, Ni:5.20～5.25%, Mo:3.08～3.12%, N:0.174～0.184%, B:0.0028～0.0035%, other is Fe and relict element.
2. boracic duplex stainless steel according to claim 1, is characterized in that, according to the mass percent meter, the chemical composition of described boracic duplex stainless steel is, C:0.018%, Si:0.48%, Mn:1.18%, P:0.025%, S:0.0003%, Cr:22.27%, Ni:5.25%, Mo:3.10%, N:0.184%, B:0.0035%, other is Fe and relict element.
3. boracic duplex stainless steel according to claim 1, is characterized in that, according to the mass percent meter, the chemical composition of described boracic duplex stainless steel is, C:0.025%, Si:0.50%, Mn:1.15%, P:0.022%, S:0.0005%, Cr:22.30%, Ni:5.20%, Mo:3.12%, N:0.178%, B:0.0028%, other is Fe and relict element.
4. boracic duplex stainless steel according to claim 1, is characterized in that, according to the mass percent meter, the chemical composition of described boracic duplex stainless steel is, C:0.020%, Si:0.54%, Mn:1.20%, P:0.024%, S:0.0004%, Cr:22.20%, Ni:5.24%, Mo:3.08%, N:0.174%, B:0.0030%, other is Fe and relict element.
5. according to the boron alloy smelting process of the arbitrary described boracic duplex stainless steel of claim 1 to 4, it is characterized in that, comprise the following steps:
Step 1, AOD refining: at 1500～1540 ℃, according to the mass percent meter, by chemical composition, be: C:1.70～2.20%, Si:0.10～0.26%, Mn:0.25～0.35%, P≤0.024%, S≤0.03%, Cr:17.80～18.20%, Ni:5. 00～5.40%, B:0.0004～0.0006%, other molten iron for Fe and relict element is injected in the AOD stove, carries out decarburization, reduction, desulphurization reaction;
Step 2, skim after the AOD tapping: molten steel is poured in baked ladle into to ladle baking to 700～900 ℃ from the AOD stove at 1650 ℃～1700 ℃; Ladle is transported to the station of skimming, and the processing of being skimmed, stay the thick 150～200mm of being of quantity of slag slag;
Step 3, the LF refining: ladle is transported to the LF stove and carry out refining, inlet temperature is 1580 ℃～1600 ℃; Carry out the Argon operation after entering the station, argon flow amount is controlled at 300～500NL/min;
1. feed aluminum steel and adjust total oxygen content≤0.002% in molten steel, the aluminum steel feed quantity is 1.0～1.5 meters/t molten steel;
2. add slag material: aluminum shot, lime and fluorite add borax simultaneously; The aluminum shot add-on is 0.2～0.3kg/t molten steel, and lime adding amount is 5.0～7.0kg/t molten steel, and the fluorite add-on is 3.0～5.0kg/t molten steel, and the borax add-on is 0.694kg～0.844 kg/t molten steel;
3. adopt Graphite Electrodes energisingization slag, after slag charge melts fully, use strong bottom blowing to stir 10～20 minutes, argon flow amount is controlled at 700～800NL/min; Under the effect of stirring at argon gas, boron enters into molten steel by diffusion from slag, with the form of the molten boron of acid, exists;
4. thermometric sampling, according to result of laboratory test, by adding molybdenum-iron, ferrosilicon, silicomanganese, ferrochrome and metallic nickel, adjust Mo, Si, Mn, Cr, Ni composition in molten steel, adjusts liquid steel temperature to 1520～1525 ℃;
5. feed silicon-calcium wire and carry out Control and Inclusion Removal, the silicon-calcium wire feed quantity is 7.0～8.0 meters/t molten steel; Adjust argon flow amount, a little less than blow 12～20 minutes, the argon bottom-blowing flow is 100～200 NL/min; The chemical composition that obtains molten steel is, C:0.018～0.025%, Si:0.48～0.54%, Mn:1.15～1.20%, P≤0.025%, S≤0.0005%, Cr:22.20～22.30%, Ni:5.20～5.25%, Mo:3.08～3.12%, N:0.174～0.184%, B:0.0028～0.0035%, other is Fe and relict element;
Step 4, continuous casting: molten steel is transported to continuous casting platform and is cast, obtain described boracic two-phase stainless product made from steel.
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CN105177401A (en) * 2015-11-02 2015-12-23 山东泰山钢铁集团有限公司 Method for producing duplex stainless steel
CN107201425A (en) * 2016-12-27 2017-09-26 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of smelting process for the middle chrome ferritic stainless steel for improving polishing performance
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CN107090537A (en) * 2017-04-20 2017-08-25 攀钢集团攀枝花钢铁研究院有限公司 Control the smelting process of Valve Steel field trash
CN107904352A (en) * 2017-11-28 2018-04-13 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of smelting process of high nitrogen martensitic stain less steel
CN110669994A (en) * 2019-10-18 2020-01-10 甘肃酒钢集团宏兴钢铁股份有限公司 Corrosion-resistant material for crust breaking hammer and method for processing crust breaking hammer by using corrosion-resistant material
CN113025772A (en) * 2021-02-07 2021-06-25 首钢集团有限公司 Method for controlling boron element content in refining process and product thereof
CN113430331A (en) * 2021-06-17 2021-09-24 山西太钢不锈钢股份有限公司 Method for eliminating high rare earth stainless steel nozzle nodulation

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