CN102719607B - Boron alloying method for ladle refining - Google Patents
Boron alloying method for ladle refining Download PDFInfo
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- CN102719607B CN102719607B CN201110077863.5A CN201110077863A CN102719607B CN 102719607 B CN102719607 B CN 102719607B CN 201110077863 A CN201110077863 A CN 201110077863A CN 102719607 B CN102719607 B CN 102719607B
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- ladle
- boron
- molten steel
- borax
- boric acid
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Abstract
The invention provides a boron alloying method for ladle refining using boric acid (H3BO3) or borax (Na2B4O7 10 H2O) as a raw material for boron alloying of molten steel. The method comprises the following steps of (1) heating the boric acid or the borax with a heating temperature being higher than 400 DEG C and heating time being greater than 10 hours; (2) transferring a ladle to an LF for refinement, adding the boric acid or the borax when slag-making materials are added, heating the molten steel with a graphite electrode, and a bottom-blowing argon flow being 0.05-0.1 Nm3/h t; (3) increasing the bottom-blowing argon flow after slag materials being melted and with bottom-blowing time being 3-10 min, heating the molten steel to a temperature of 1580-1600 DEG C with the graphite electrode, and moving out the ladle; and then adding ferrotitanium according to a requirement. The raw materials of the boron alloying are rich in resources and have a wide source. Adopting the boric acid or the borax to replace ferroboron for alloying, the method has a low alloying cost, is simple and reasonable in operation, and is energy-saving and environmental-friendly.
Description
Technical field
The invention belongs to steelmaking technical field, particularly a kind of ladle refining boron alloy method.
Background technology
The adding of trace B (boron content is generally 0.0005%～0.0035%) in steel; its objective is in order to improve the hardening capacity of steel; because the chemical property of boron is very active; in alloying process very easily with steel in the element reaction such as oxygen, nitrogen; thereby the recovery rate that causes boron is low and unstable; therefore, metallargist is devoted to the research of boron alloy metallization processes for a long time always.
While adopting converter smelting → ladle refining explained hereafter boron steel, conventional method is in the refining later stage, by adding the abundant deoxidation of aluminium, add the abundant fixed nitrogens of iron alloy such as titanium, zirconium, then add again ferro-boron or boron line alloy to turn to technical characteristics, so that the homogeneity that the recovery rate of boron, boron distribute in steel and the performance of steel reach requirement.Chinese patent 200710049005.3 discloses a kind of method of converter smelting boron steel, the method adopts the method for converter smelting → ladle deoxidation → LF refining → continuous casting to produce boron steel, LF refining finishes to guarantee total amount≤2.0% of FeO and MnO in slag, molten steel dissolved oxygen activity≤10 * 10
-6, after this add ferrotianium, ferro-boron, the recovery rate of boron is 69.4%～91.8%.The boron-containing steel that Chinese patent 200810015497.9 is introduced is smelted and is adopted converter → LF → VD production technique, controls total amount≤1.5% of LF final slag composition FeO and MnO, SiO
2content≤15%, after this adds ferro-boron or feeding ferro-boron cored-wire, finally carries out VD vacuum-treat, and the boron rate of recovery is stabilized in more than 90%.From reported documents and materials, the most employings of boron alloyization at present add the modes of ferro-boron, and the abundant deoxidation of molten steel, fixed nitrogen before ferro-boron adds, guarantee that boron has higher recovery rate.
The deficiency of existing boron alloy metallization processes is that ferro-boron cost is higher, and therefore higher the and contaminate environment of ferro-boron preparation process energy consumption simultaneously, is necessary to develop a kind of starting material wide material sources, ladle refining process boron alloy method that production cost is low.
Summary of the invention
The object of the invention is to solve the existing deficiency of above-mentioned prior art, provide that a kind of starting material wide material sources, production cost are low, the ladle refining process boron alloy method of energy-conserving and environment-protective.
The present invention is achieved in that this ladle refining boron alloy method adopts boric acid (H
3bO
3) or borax (Na
2b
4o
710H
2o) as molten steel boron alloy raw material, comprise the following steps: heat boric acid or borax (1), Heating temperature is greater than 400 ℃, is greater than 10 hours heat-up time; (2) ladle is transported to LF, start refining, add boric acid or borax when adding slag material, with Graphite Electrodes, molten steel is heated, in heat-processed, argon bottom-blowing flow is 0.05～0.1Nm
3/ ht; (3), after slag charge melts completely, increase argon bottom-blowing flow to 0.3～0.5Nm
3/ ht, and can be again carry out deep deoxidation to adding aluminium in ladle depending on slag making situation, bottom blowing churning time is 3～10min, with Graphite Electrodes, molten steel is heated up, and during 1580～1600 ℃ of liquid steel temperatures, takes out of; (4) be further to improve the recovery rate of boron, now ladle can be transported to VD station, molten steel is carried out to vacuum-treat, vacuum tightness is 67～100Pa, and argon bottom-blowing flow is 0.09～0.3Nm
3/ ht, refining finishes mass percent sum≤2.0% of FeO and MnO in slag, molten steel dissolved oxygen activity≤10 * 10
-6; (5) add on request ferrotianium.
Slag material described in ladle refining boron alloy method of the present invention comprises one or more in lime, fluorite, bauxitic clay, calcium carbide or aluminium, and add-on is steel 8～15kg per ton.
The present invention adopts boric acid or the borax (boric acid (H adding in LF slag through heating
3bO
3) be the hydrate (B of boron oxide
2o
33H
2o), proportion 1.435, generates boron trioxide (B while being heated to 300 ℃
2o
3), be the raw material of preparing ferro-boron; Borax (Na
2b
4o
710H
2o) in chemical constitution, be the sodium tetraborate that contains 10 water moleculess, 320 ℃ lose whole crystal water, during 1.73,878 ℃ of proportions, are molten into glassy mass, contain acidic oxide B in melt
2o
3, be the raw material of preparing boric acid), in LF top slag upgrading process, the boron in slag is entered in molten steel, boron recovery rate is 70%～80%.
Compare with common process, the present invention has following beneficial effect:
(1) alloying material wide material sources.Boric acid is the raw material of preparing ferro-boron, and borax is the raw material of preparing boric acid, compares with ferro-boron or boron line, and the resource of boric acid and borax is abundanter, originates more extensive.
(2) reduce production costs.Ferro-boron price is 3～4 times of boric acid price, be 6～7 times of borax price, and boron-containing quantity is more or less the same, and therefore, adopts boric acid or borax to replace ferro-boron to carry out alloying, in the situation that recovery rate is identical, will reduce total alloying cost.
(3) energy-saving and environmental protection.Ferro-boron or boron line preparation process will consume the higher energy, and contaminate environment, and the present invention utilizes boric acid or borax directly to carry out molten steel boron alloy, more energy-conservation and environmental protection.
(4) operation is simple.The present invention completes boron alloy in the slag upgrading of LF top, makes whole operation simpler and more direct, reasonable.
Embodiment
The present invention is further described by the following embodiment.
Embodiment 1:
Steel grade Q550ZFD, target boron content is 0.002%.Concrete boron alloy metallization processes is:
(1) utilize industrial gas boric acid to be carried out to the heated baking of continuous 12 hours, storing temperature is 500 ℃.
(2) 250t molten steel is transported to after LF station, and refining starts, and adds lime 2.3t, fluorite 0.35t, aluminium 0.3t, add the boric acid 21kg after baking simultaneously, utilize Graphite Electrodes to heat molten steel, control voltage is 435V, electric current 50000A, guarantees that slag charge melts completely.It is 15Nm that heat-processed is controlled argon bottom-blowing flow
3/ h.
(3), after slag charge melts completely, increase argon bottom-blowing flow to 100Nm
3/ h, churning time 7min.
(4) thermometric sampling, adds ferro-titanium.
Before refining, residual boron amount≤0.0001% in sampling analysis steel, detecting Finished Steel boron content is 0.0021%, boron recovery rate is 75%.
Embodiment 2:
Steel grade Q690ZFD, target boron content is 0.0017%.Concrete boron alloy metallization processes is:
(1) utilize industrial gas borax to be carried out to the heated baking of continuous 12 hours, storing temperature is 500 ℃.
(2) 100t molten steel is transported to after LF station, and refining starts, and adds lime 1.2t, fluorite 0.2t, aluminium 0.15t, adds the borax 9.5kg after baking simultaneously, utilizes Graphite Electrodes to heat molten steel, and it is 5Nm that heat-processed is controlled argon bottom-blowing flow
3/ h.
(3), after slag charge melts completely, increase argon bottom-blowing flow to 50Nm
3/ h, adds aluminium 0.06t, churning time 5min simultaneously again.Utilize Graphite Electrodes to heat up to molten steel, taking out of temperature is 1592 ℃.
(4) ladle is transported to VD station, molten steel is carried out to vacuum-treat.Vacuum tightness is 67Pa, and argon bottom-blowing flow is 20Nm
3/ h, 10 minutes treatment times.Refining finishes the mass percent sum 1.5% of FeO and MnO in slag, molten steel dissolved oxygen activity 1.5 * 10
-6.
(5) thermometric sampling, adds ferro-titanium.
Before refining, residual boron amount≤0.0001% in sampling analysis steel, detecting Finished Steel boron content is 0.0019%, boron recovery rate is 82.6%.
Claims (4)
1. a ladle refining boron alloy method, is characterized in that adopting boric acid (H
3bO
3) or borax (Na
2b
4o
710H
2o) as molten steel boron alloy raw material, comprise the following steps: heat boric acid or borax (1), Heating temperature is greater than 400 ℃, is greater than 10 hours heat-up time; (2) ladle is transported to LF, start refining, add boric acid or borax when adding slag material, with Graphite Electrodes, molten steel is heated, in heat-processed, argon bottom-blowing flow is 0.05～0.1Nm
3/ ht; (3), after slag charge melts completely, increase argon bottom-blowing flow to 0.3～0.5Nm
3/ ht, bottom blowing churning time is 3～10min, with Graphite Electrodes, molten steel is heated up, and during 1580～1600 ℃ of liquid steel temperatures, takes out of; (4) add on request ferrotianium.
2. ladle refining boron alloy method according to claim 1, is transported to VD station by ladle it is characterized in that adding ferrotianium after ladle is taken out of before, and molten steel is carried out to vacuum-treat, and vacuum tightness is 67～100Pa, and argon bottom-blowing flow is 0.09～0.3Nm
3/ ht, refining finishes mass percent sum≤2.0% of FeO and MnO in slag, molten steel dissolved oxygen activity≤10 * 10
-6.
3. ladle refining boron alloy method according to claim 1, is characterized in that described slag material comprises one or more in lime, fluorite, bauxitic clay, calcium carbide or aluminium, and add-on is steel 8～15kg per ton.
4. ladle refining boron alloy method according to claim 1, is characterized in that after slag charge melts completely, depending on slag making situation, again to adding aluminium in ladle, carries out deep deoxidation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110077863.5A CN102719607B (en) | 2011-03-29 | 2011-03-29 | Boron alloying method for ladle refining |
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|---|---|---|---|
| CN201110077863.5A CN102719607B (en) | 2011-03-29 | 2011-03-29 | Boron alloying method for ladle refining |
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|---|---|
| CN102719607A CN102719607A (en) | 2012-10-10 |
| CN102719607B true CN102719607B (en) | 2014-05-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103436656B (en) * | 2013-08-26 | 2015-12-23 | 江苏大学 | A kind of borax replaces ferro-boron to carry out the boron micro-alloyed method of steel |
| CN103451362B (en) * | 2013-08-26 | 2015-07-08 | 江苏大学 | Method for carrying out boron microalloying on steel by using boric acid instead of ferroboron |
| CN105274281A (en) * | 2014-06-23 | 2016-01-27 | 鞍钢股份有限公司 | Method used for controlling boron content in steel accurately |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045948A (en) * | 2007-04-29 | 2007-10-03 | 攀钢集团攀枝花钢铁研究院 | Boron steel producing converter smelting process |
| CN101250659A (en) * | 2008-04-08 | 2008-08-27 | 莱芜钢铁股份有限公司 | Method for improving and stabilising boron recovery rate for vacuum smelting steel containing boron |
| CN101613786A (en) * | 2009-07-21 | 2009-12-30 | 大石桥市荣源镁矿有限公司 | Boron-containing modifier for ladle covering slag and using method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05295417A (en) * | 1992-04-23 | 1993-11-09 | Nippon Steel Corp | Treatment of molten steel |
| JP3675302B2 (en) * | 2000-05-30 | 2005-07-27 | 住友金属工業株式会社 | Detoxification method for stainless steel slag |
-
2011
- 2011-03-29 CN CN201110077863.5A patent/CN102719607B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045948A (en) * | 2007-04-29 | 2007-10-03 | 攀钢集团攀枝花钢铁研究院 | Boron steel producing converter smelting process |
| CN101250659A (en) * | 2008-04-08 | 2008-08-27 | 莱芜钢铁股份有限公司 | Method for improving and stabilising boron recovery rate for vacuum smelting steel containing boron |
| CN101613786A (en) * | 2009-07-21 | 2009-12-30 | 大石桥市荣源镁矿有限公司 | Boron-containing modifier for ladle covering slag and using method thereof |
Non-Patent Citations (4)
| Title |
|---|
| JP特开2001-335823A 2001.12.04 |
| JP特开平5-295417A 1993.11.09 |
| 李要辉等.硼及其硼化物在材料研究中应用进展.《辽宁建材》.2006,(第5期),35-38. |
| 硼及其硼化物在材料研究中应用进展;李要辉等;《辽宁建材》;20061231(第5期);35-38 * |
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| CN102719607A (en) | 2012-10-10 |
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