CN105274281A - Method used for controlling boron content in steel accurately - Google Patents
Method used for controlling boron content in steel accurately 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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Abstract
The invention provides a method used for controlling boron content in steel accurately. According to the method, in converter tapping process, a deoxidizing agent is added into steel ladle for preliminary dexidation; argon station argon blowing time is controlled to be 3min or longer, argon flow rate is controlled to be 40 to 60Nm3/h; in LF furnace refining process, LF finished point is controlled to be alpha [O]<=0.0003%; in RH furnace refining process, circulation nitrogen removing is carried out, when in liquid steel, [N]<=0.0020%, a boron-containing sphere substance is added for boron alloying based on boron content requirements of molten steel, adding amount is controlled to be 0.05 to 0.5kg/t steel, adding is carried out in a continuous vibration mode, and steel tapping is carried out after 3 to 5min of clean circulating; and protective casting is adopted in continuous casting. The method is capable of reducing using amount of precious metal, reducing production cost, increasing stability and yield of boron in steel, and increasing boron yield to be 70 to 90%.
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)
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|---|---|---|---|
| CN201410284076.1A CN105274281A (en) | 2014-06-23 | 2014-06-23 | Method used for controlling boron content in steel accurately |
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|---|---|---|---|
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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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| CN101319260A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Technique for controlling accurate addition of micro-element in steel |
| CN101812643A (en) * | 2009-11-30 | 2010-08-25 | 莱芜钢铁股份有限公司 | Boracic pinion steel and preparation method thereof |
| CN102409133A (en) * | 2011-12-05 | 2012-04-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing 23MnB steel by adopting vacuum process |
| 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 | Boron alloying method for ladle refining |
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101319260A (en) * | 2008-07-17 | 2008-12-10 | 鞍钢股份有限公司 | Technique for controlling accurate addition of micro-element in steel |
| CN101812643A (en) * | 2009-11-30 | 2010-08-25 | 莱芜钢铁股份有限公司 | Boracic pinion steel and preparation method thereof |
| CN102719607A (en) * | 2011-03-29 | 2012-10-10 | 鞍钢股份有限公司 | Boron alloying method for ladle refining |
| CN102409133A (en) * | 2011-12-05 | 2012-04-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for producing 23MnB steel by adopting vacuum process |
| 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 |
| 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 |
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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Application publication date: 20160127 |