CN105274281A - Method for accurately controlling boron content in steel - Google Patents
Method for accurately controlling boron content in steel Download PDFInfo
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- CN105274281A CN105274281A CN201410284076.1A CN201410284076A CN105274281A CN 105274281 A CN105274281 A CN 105274281A CN 201410284076 A CN201410284076 A CN 201410284076A CN 105274281 A CN105274281 A CN 105274281A
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- boron
- steel
- argon
- boracic
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- 229910052796 boron Inorganic materials 0.000 title claims abstract description 76
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 29
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910052786 argon Inorganic materials 0.000 claims abstract description 24
- 238000003723 Smelting Methods 0.000 claims abstract description 21
- 238000007670 refining Methods 0.000 claims abstract description 18
- 238000010079 rubber tapping Methods 0.000 claims abstract description 9
- 238000005275 alloying Methods 0.000 claims abstract description 8
- 238000009749 continuous casting Methods 0.000 claims abstract description 8
- 238000007664 blowing Methods 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 239000011230 binding agent Substances 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 9
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- 239000000440 bentonite Substances 0.000 claims description 4
- 235000019353 potassium silicate Nutrition 0.000 claims description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 4
- 230000001351 cycling effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 229910000510 noble metal Inorganic materials 0.000 abstract description 4
- 125000004122 cyclic group Chemical group 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000002436 steel type Substances 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000004411 aluminium Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 229910000616 Ferromanganese Inorganic materials 0.000 description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 5
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910000712 Boron steel Inorganic materials 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 2
- 229910014458 Ca-Si Inorganic materials 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- ZDVYABSQRRRIOJ-UHFFFAOYSA-N boron;iron Chemical compound [Fe]#B ZDVYABSQRRRIOJ-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a method for accurately controlling the boron content in steel, wherein a deoxidizer is added into a steel ladle for pre-deoxidation in the converter tapping process; the argon blowing time of the argon station is more than or equal to 3min, and the argon flow is 40-60 Nm3H is used as the reference value. Refining control end point alpha of LF furnace[O]Less than or equal to 0.0003 percent. Refining in RH furnace for cyclic denitrification gas treatment, and treating in molten steel as [ N ]]And when the content is less than or equal to 0.0020%, adding boron-containing spheres according to the boron content requirement of the smelting steel type for boron alloying, wherein the adding amount is 0.05-0.5 kg/t of steel, adding in a continuous vibration mode, and tapping after net circulation is carried out for 3-5 min. And protective pouring is adopted for continuous casting. The invention can not only reduce the use of noble metal and the production cost, but also improve the stability and the yield of boron in steel, and lead the yield of boron to reach 70 to 90 percent.
Description
Technical field
The invention belongs to smelting technology technical field, be specifically related to a kind of method of smelting Boron contents in accurate control steel in boron-containing steel process.
Background technology
A small amount of boron is added mainly in order to improve the hardening capacity of steel in steel.Because the chemical property of boron is very active, be easy to the oxygen in steel, nitrogen is combined, make boron ineffective, and Boron contents in steel is few again, so how to ensure that in the smelting of boron steel it is very important for stably obtaining appropriate acid-soluble boron and being evenly distributed in steel.
Tradition smelts the technique of boron-containing steel normally in the middle and later periods of steel-making external refining (LF stove, VD stove, RH stove), by adding the abundant deoxidation of the alloy such as aluminium, zirconium, add the abundant fixed nitrogen of titanium alloy, add ferro-boron more afterwards or boracic cored-wire carries out boron alloyed, to consume noble metal titanium to ensure the recovery rate of boron.
Describe application traditional technology in document " special steel " the 5th phase in 1992 " metallurgy factor is on the impact of the B rate of recovery in boron steel " and smelt boron-containing steel, adopt the alloy feed postition of deoxidation fixed nitrogen, its optimum content should control at Al:0.02% ~ 0.05%, Ti:0.03% ~ 0.05%, addition sequence is Al-Ti-B, and the rate of recovery of this kind of technique boron is only 10% ~ 65%.
Feeding boracic cored-wire mode is adopted to carry out boron alloyed in patent " production method of continuous small-billet casting low-carbon boron-containing steel " (CN1309856C), difference first feeds Ca-Si cored-wire before feeding boracic cored-wire, carry out inclusions class, cleaning molten steel, but the rate of recovery of boron is only 40% ~ 50% after this operation process, be not improved, and the Mn/S in strict restriction molten steel is not less than 13.
The cored-wire introduced in " composite core-spun yarn of a kind of ferro-boron and ferrotianium and application thereof " (CN101445855A) can make the boron rate of recovery reach 90%, but the method still improves the rate of recovery of boron to consume ferrotianium for cost, though adopt line feeding mode can improve boron recovery rate, but still there is the common problem of molten steel line feeding, namely the instability problems such as the degree of depth of molten steel, recovery rate, homogeneity are fed, in addition, the technique making cored-wire is more complicated, and cost is higher.
Be different from above-mentioned traditional smelting technology method, patent publication No. CN1296504C discloses one " method with the direct smelting boron steel of pig iron containing boron ", and its boracic molten iron adopts blast furnace separating boron iron ore to extract B
2o
3time the one nature boracic metallic product that obtains.But, because in boracic molten iron, silicon and sulphur content are very high, be respectively 2.0% ~ 2.5% and 0.06% ~ 0.10%, so cause the quantity of slag that produces in steelmaking process large, production cost increased; In addition, boron is with B
2o
3form exists, and in steelmaking process, will float up in slag and remove, and reduce the recovery rate of boron.
Above introduced boron alloyed method, adopts ferro-boron or boracic cored-wire all to need to consume noble metal titanium to ensure the recovery rate of boron in steel.In addition, adopt the recovery rate of these processing method boron very unstable, and homogeneity is poor.Therefore, need to work out a kind of new method to improve boron recovery rate and stability, and can production cost be reduced.
Summary of the invention
The invention provides the method for Boron contents in a kind of accurate control steel, its object is to the recovery rate and the stability that improve boron, reduce the add-on of metal titanium during fixed nitrogen, reduce production cost.
For this reason, this invention takes following solution:
A method for Boron contents in accurate control steel, is characterized in that:
1, converter smelting, adds reductor and carries out pre-deoxidation in ladle in tapping process; Enter argon station argon blowing time>=3min, argon flow amount is 40 ~ 60Nm
3/ h.
2, LF stove refining, carries out into divisional processing and the Alloying Treatment except boron alloyed, LF terminal point control α
[O]≤ 0.0003%.
3, RH stove refining, carries out cycling denitrification gas disposal, when in molten steel during [N]≤0.0020%, require that adding boracic spheroid carries out boron alloyed according to the Boron contents smelting steel grade, add-on is 0.05 ~ 0.5kg/t steel, adopts continuous shaking mode to add, and taps after the 3 ~ 5min that only circulates.
4, continuous casting, takes molding casting.
Described boracic spheroid is made up of shell and core two portions, and its shell composition wt% is: B
4c90% ~ 95%, binding agent 5% ~ 10%; Core composition wt% is: B
4c20% ~ 60%, rhombohedral iron ore 10% ~ 40%; CaCO
310% ~ 40%, binding agent 3% ~ 5%.
Described binding agent is one in clay, bentonite, high-alumina cement, wilkinite, water glass or any two kinds of mixtures.
Beneficial effect of the present invention is:
The present invention is by the correlation parameter in control smelting and refining process and technique, and utilize boracic spheroid to replace metal titanium to carry out fixed nitrogen, not only can reduce the use of noble metal, reduce production cost, and stability and the recovery rate of boron in steel can be improved, make boron recovery rate reach 70% ~ 90%.Therefore, the present invention no matter from production cost, or boron recovery rate and stability all will be far superior to traditional boron producing and manufacturing technique, has good application prospect.
Embodiment
Embodiment 1:
Smelting boron-containing quantity is the steel for engineering mechanism purpose of 0.0020% ~ 0.0035%.
1, converter smelting, Metal Weight 102 tons, in molten steel, add ferrosilicon in tapping process, ferromanganese, aluminium carries out deoxidation, then enter argon station Argon 4min, argon flow amount is 45Nm
3/ h.
2, LF stove refining, carries out into divisional processing and the Alloying Treatment except boron alloyed, terminal α
[O]=0.0002%.
3, RH stove refining, when in molten steel during [N]=0.0017%, adopts continuous shaking mode to add 36kg boracic spheroid from alloy feed bin, and molten steel only samples after circulation 3min and analyzes.Boracic spheroid adds front molten steel Boron contents 0.0004%, adds rear Boron contents 0.0026%, obtains boron recovery rate 78.8% as calculated.
4, continuous casting takes molding casting.
Boracic spheroid component wt% is: core: B
4c20%, rhombohedral iron ore 40%, CaCO
335%, clay 5%.Shell: B
4c90%, clay 10%.Core sphere diameter 20mm, outer casing thickness 4mm, whole sphere diameter is 28mm.
Embodiment 2:
Smelting boron-containing quantity is the steel for engineering mechanism purpose of 0.0020% ~ 0.0035%.
1, converter smelting, Metal Weight 95 tons, in molten steel, add ferrosilicon in tapping process, ferromanganese, aluminium carries out deoxidation, then enter argon station Argon 3min, argon flow amount is 50Nm
3/ h.
2, LF stove refining, carries out into divisional processing and the Alloying Treatment except boron alloyed, terminal α
[O]=0.0003%.
3, RH stove refining, when in molten steel during [N]=0.0015%, adopts continuous shaking mode to add 22.5kg boracic spheroid from alloy feed bin, and molten steel only samples after circulation 4min and analyzes.Boracic spheroid adds front molten steel Boron contents 0.0003%, adds rear Boron contents 0.0028%, boron recovery rate 86.7%.
4, continuous casting, takes molding casting.
Boracic spheroid component wt% is: core: B
4c30%, rhombohedral iron ore 30%, CaCO
335%, high-alumina cement 5%.Shell: B
4c92%, high-alumina cement 8%.Core sphere diameter 22mm, outer casing thickness 4mm, whole sphere diameter is 30mm.
Embodiment 3:
Smelting boron-containing quantity is the steel for engineering mechanism purpose of 0.0020% ~ 0.0035%.
1, converter smelting, Metal Weight 101 tons, in molten steel, add ferrosilicon in tapping process, ferromanganese, aluminium carries out deoxidation, then enter argon station Argon 5min, argon flow amount is 50Nm
3/ h.
2, LF stove refining, carries out into divisional processing and the Alloying Treatment except boron alloyed, terminal α
[O]=0.0002%.
3, RH stove refining, when in molten steel during [N]=0.0016%, adopts continuous shaking mode to add 19kg boracic spheroid from alloy feed bin, and molten steel only samples after circulation 5min and analyzes.Spheroid adds front molten steel Boron contents 0.0004%, adds rear Boron contents 0.0030%, obtains boron recovery rate 89.3% as calculated.
4, continuous casting, takes molding casting.
Boracic spheroid component wt% is: core B
4c40%, rhombohedral iron ore 30%, CaCO
327%, 2% clay+1% water glass.Shell: B
4c95%, binding agent are 3% clay+2% water glass.Core sphere diameter 23mm, outer casing thickness 5mm, whole sphere diameter is 33mm.
Embodiment 4:
Smelting boron-containing quantity is the steel for engineering mechanism purpose of 0.0020% ~ 0.0035%.
1, converter smelting, Metal Weight 100.3 tons, in molten steel, add ferrosilicon in tapping process, ferromanganese, aluminium carries out deoxidation, then enter argon station Argon 4min, argon flow amount is 60Nm
3/ h.
2, LF stove refining, carries out into divisional processing and the Alloying Treatment except boron alloyed, terminal α
[O]=0.0003%.
3, RH refining, when in molten steel during [N]=0.0020%, adopts continuous shaking mode to add 15.3kg boracic spheroid from alloy feed bin, and molten steel only samples after circulation 5min and analyzes.Spheroid adds front molten steel Boron contents 0.0004%, adds rear Boron contents 0.0029%, boron recovery rate 84.3%.
4, continuous casting, takes molding casting.
Boracic spheroid component wt% is: core: B
4c50%, rhombohedral iron ore 25%, CaCO
322%, bentonite 3%.Shell: B
4c93%, bentonite 7%.Core sphere diameter 25mm, outer casing thickness 4mm, whole sphere diameter is 33mm.
Embodiment 5:
Smelting boron-containing quantity is the steel for engineering mechanism purpose of 0.0020% ~ 0.0035%.
1, converter smelting, Metal Weight 102 tons, in molten steel, add ferrosilicon in tapping process, ferromanganese, aluminium carries out deoxidation, then enter argon station Argon 5min, argon flow amount is 60Nm
3/ h.
2, LF stove refining, carries out into divisional processing and the Alloying Treatment except boron alloyed, terminal α
[O]=0.0002%.
3, RH stove refining, when in molten steel during [N]=0.0018%, adopts continuous shaking mode to add 11.8kg boracic spheroid from alloy feed bin, and molten steel only samples after circulation 4min and analyzes.Spheroid adds front molten steel Boron contents 0.0003%, adds rear Boron contents 0.0026%, boron recovery rate 82.7%.
4, continuous casting, takes molding casting.
Boracic spheroid component wt% is: core: B
4c60%, rhombohedral iron ore 20%, CaCO
315%, binding agent is 3% wilkinite+2% high-alumina cement.Shell: B
4c93%, binding agent are 5% wilkinite+2% high-alumina cement.Core sphere diameter 25mm, outer casing thickness 3mm, whole sphere diameter is 31mm.
Claims (2)
1. accurately control a method for Boron contents in steel, it is characterized in that:
(1) converter smelting, adds reductor and carries out pre-deoxidation in ladle in tapping process; Enter argon station argon blowing time>=3min, argon flow amount is 40 ~ 60Nm
3/ h;
(2) LF stove refining, carries out into divisional processing and the Alloying Treatment except boron alloyed, LF terminal point control α
[O]≤ 0.0003%;
(3) RH stove refining, carry out cycling denitrification gas disposal, when in molten steel during [N]≤0.0020%, require that adding boracic spheroid carries out boron alloyed according to the Boron contents smelting steel grade, add-on is 0.05 ~ 0.5kg/t steel, adopt continuous shaking mode to add, and tap after the 3 ~ 5min that only circulates;
(4) continuous casting, takes molding casting.
2. the method for Boron contents in accurate control steel according to claim 1, it is characterized in that, described boracic spheroid is made up of shell and core two portions, and its shell composition wt% is: B
4c90% ~ 95%, binding agent 5% ~ 10%; Core composition wt% is: B
4c20% ~ 60%, rhombohedral iron ore 10% ~ 40%; CaCO
310% ~ 40%, binding agent 3% ~ 5%;
Described binding agent is one in clay, bentonite, high-alumina cement, wilkinite, water glass or any two kinds of mixtures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410284076.1A CN105274281A (en) | 2014-06-23 | 2014-06-23 | Method for accurately controlling boron content in steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410284076.1A CN105274281A (en) | 2014-06-23 | 2014-06-23 | Method for accurately controlling boron content in steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105274281A true CN105274281A (en) | 2016-01-27 |
Family
ID=55144106
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410284076.1A Pending CN105274281A (en) | 2014-06-23 | 2014-06-23 | Method for accurately controlling boron content in steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105274281A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756440A (en) * | 2017-03-15 | 2017-05-31 | 常熟理工学院 | A kind of smelting process of precise control boron-containing alloy steel Boron contents |
| CN110373514A (en) * | 2019-08-30 | 2019-10-25 | 马鞍山钢铁股份有限公司 | A kind of stable method for improving boron recovery rate in steel |
| CN115449701A (en) * | 2022-09-20 | 2022-12-09 | 西安建筑科技大学 | Smelting process for improving banded structure of low-carbon gear steel and low-carbon gear steel |
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| CN102676948A (en) * | 2012-05-30 | 2012-09-19 | 南京钢铁股份有限公司 | Boron-containing tire cord steel and preparation method thereof |
| CN102719607A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Ladle refining boron alloying method |
| CN103160738A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | Low-cost boron-containing steel and manufacturing method thereof |
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2014
- 2014-06-23 CN CN201410284076.1A patent/CN105274281A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| CN101319260A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Process method for controlling accurate addition of trace elements in steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106756440A (en) * | 2017-03-15 | 2017-05-31 | 常熟理工学院 | A kind of smelting process of precise control boron-containing alloy steel Boron contents |
| CN110373514A (en) * | 2019-08-30 | 2019-10-25 | 马鞍山钢铁股份有限公司 | A kind of stable method for improving boron recovery rate in steel |
| CN115449701A (en) * | 2022-09-20 | 2022-12-09 | 西安建筑科技大学 | Smelting process for improving banded structure of low-carbon gear steel and low-carbon gear steel |
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Application publication date: 20160127 |