CN103911486B - A kind of method removing titanium in bearing steel molten steel - Google Patents
A kind of method removing titanium in bearing steel molten steel Download PDFInfo
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- CN103911486B CN103911486B CN201410133333.1A CN201410133333A CN103911486B CN 103911486 B CN103911486 B CN 103911486B CN 201410133333 A CN201410133333 A CN 201410133333A CN 103911486 B CN103911486 B CN 103911486B
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Abstract
The invention belongs to special steel field of smelting, particularly, the present invention relates to a kind of method removing titanium in bearing steel molten steel.The method of titanium in removal bearing steel molten steel of the present invention, comprises the following steps: 1) after utilizing the oxidation of electrosmelting bearing steel to skim latter stage, add in electric furnace by high titanium ferrochrome; 2) utilize silicomanganese pre-deoxidation, the slag charge of winding-up synthesis simultaneously adsorption and oxidation titanium impurity, wherein, the composition of described synthesis slag charge comprises: the SiO of the MnO of 55wt% ~ 75wt%, 25wt% ~ 45wt%
2; 3) slag free tapping after winding-up synthesis slag charge, adds aluminium matter reductor with steel stream during tapping and calcium aluminate class synthetic slag carries out deoxidation and removes impurity.After the present invention adopts slag free tapping to operate, the titanium oxide content in ladle top slag is very low, can reduce back titanium amount greatly, and in refining process, molten steel increases titanium amount trace.
Description
Technical field
The invention belongs to special steel field of smelting, particularly, the present invention relates to a kind of method removing titanium in bearing steel molten steel.
Background technology
Titanium affects the fatigue lifetime of bearing steel, and high-grade bearing steel has strict demand to titanium, minimum requirements Ti≤15ppm.It is that molten steel increases the maximum link of titanium amount that bearing steel is just made steel in liquid deoxidation alloying process, and preferred low titanium alloy is the main method that our times various countries reduce bearing steel titanium content, but low titanium alloy is expensive.Adopt low titanium ferrochromium LF to enter the station titanium content about 20 ~ 30PPM, adopt common ferrochrome, more than titanium content 30ppm.Common ferrochrome, ferromanganese, the titanium of ferrosilicon about containing 0.2%-0.4%, low titanium ferrochromium contains the titanium of 0.03%-0.1%, in current removal alloy, the method for titanium is in patent: " reduce the method for titanium content in high-carbon chromium bearing steel, the patent No. 201110354628.8 " in set forth to some extent, method is: in the process of tapping, first carry out alloying, utilize the dissolved oxygen in molten steel and titanium to react and generate titanium oxide, float and remove, add aluminium matter reductor again, wash heat material carries out deoxidation removal and is mingled with, but cause two problems like this, problem is that dissolved aluminum in refining process in molten steel can titanium oxide in reduced blast furnace, cause back titanium phenomenon, the titanium of 10 ~ 15PPm is about increased in whole refining process, Second Problem is for adding latter stage in tapping due to aluminium matter reductor and wash heat material, the aluminium sesquioxide generated is mingled with does not have the sufficient time to float or Adsorption, cause the task of refining removal of inclusions overweight.
The Kobe Steel of Japan adopts converter less-slag amount top bottom blowing Smelting Bearing Steel, iron alloy high for titaniferous is added in converter, reach the object that titanium is removed in oxidation, but how quick adsorption is mingled with for the titanium oxide generated remove, avoids titanium oxide to be mixed in entering ladle with molten steel in tapping process not making a search.
For above technical deficiency, the invention provides a kind of eaf process removing titanium in bearing steel molten steel.
Summary of the invention
For above technical deficiency, the invention provides a kind of eaf process removing titanium in bearing steel molten steel.
The electric furnace method of titanium in removal bearing steel molten steel of the present invention, comprises the following steps:
1) after utilizing the oxidation of electrosmelting bearing steel to skim latter stage, high titanium ferrochrome is added in electric furnace;
2) utilize silicomanganese pre-deoxidation, the slag charge of winding-up synthesis simultaneously adsorption and oxidation titanium impurity, wherein, the composition of described synthesis slag charge comprises: the SiO of the MnO of 55wt% ~ 75wt%, 25wt% ~ 45wt%
2;
3) slag free tapping after winding-up synthesis slag charge, adds aluminium matter reductor with steel stream during tapping and calcium aluminate class synthetic slag carries out deoxidation and removes impurity.
The invention provides a kind of containing MnO and SiO
2synthesis slag charge, its composition range is that MnO is about 55% ~ 75%, SiO
2be about 25% ~ 45%, its composition range is at Fig. 1 (MnO-SiO
2be state graph) in a-quadrant, generate the compound 2MnOSiO that a fusing point is 1350 DEG C in a-quadrant
2(tephroite) and 1251 DEG C formed an eutectic.This synthesis slag charge belongs to acid slag, and fusing point is not more than molten steel, and density is also not more than the density of steel, has an effect all being mingled with, have good adsorption effect to alkaline inclusiones such as titanium oxide in energy and steel.
According to the electric furnace method of titanium in removal bearing steel molten steel of the present invention, step 2) described silicomanganese pre-deoxidation step is according to knowhow, with ferrosilicon and ferromanganese composition, or with silicomanganese adjustment molten steel composition to subject component (Mn content 0.1wt% ~ 0.4wt%, Si content 0.1wt% ~ 0.2wt%), the rate of recovery that wherein rate of recovery of Si gets 70%, Mn gets 85%, does not reclaim Si, Mn amount of element entered in molten steel and is " silicomanganese pre-deoxidation " used up amount.
According to the electric furnace method of titanium in removal bearing steel molten steel of the present invention, the preparation method of described synthesis slag charge comprises the following steps:
1) with industrial manganese dioxide powder 40wt% ~ 50wt%, quartz sand 25wt% ~ 35wt%, rich manganese ore 20wt% ~ 25wt% for raw material, weigh batching, mixing;
2) by the mixing raw material of step 1) with temperature 1450 ~ 1550 DEG C of fritting, release in stove after fusing evenly, liquid slag come out of the stove after cooling;
3) will cool slag fragmentation processing, size is 1 ~ 20mm, obtained synthesis slag charge.
Above-mentioned obtained synthesis slag charge keeps dry state, and weather-proof dressing is stand-by, and the heat fused of pre-melted slag can use the method such as heated by gas, electrically heated.
According to the electric furnace method of titanium in removal bearing steel molten steel of the present invention, step 2) described industrial manganese dioxide powder comprises by mass percentage: MnO
2>75%, P<0.01%, S<0.04%; Described quartz sand comprises by mass percentage: SiO
2>90%, P<0.01%, S<0.04%; Described rich manganese ore comprises by mass percentage: MnO
245% ~ 55%, SiO
210% ~ 20%, Al
2o
35% ~ 15%, P<0.01%, S<0.04%.
According to the electric furnace method of titanium in removal bearing steel molten steel of the present invention, described in step 3), aluminium matter reductor is preferably aluminium ferromanganese or steel-core-aluminium.
Tool of the present invention has the following advantages:
1, after electric furnace oxidation is skimmed latter stage, carry out alloying can titanium in fully oxidized alloy, and cheap titanium master alloy can be adopted to reduce production cost.
2, in electric furnace, more than winding-up the synthetic slag of formula can adsorb TiO
2, MnO, SiO
2be mingled with, titanium oxide dissolves absorption through slag charge and floats in electric furnace slag, improves molten steel purity.After adopting slag free tapping operation, the titanium oxide content in ladle top slag is very low, can reduce back titanium amount greatly, and in refining process, molten steel increases titanium amount trace.
3, adopt silicomanganese pre-deoxidation can reduce [O] content in tapping molten steel greatly, reduce aluminium matter reductor usage quantity, and then reduce category-B inclusion (alumina type), improve bearing steel work-ing life.
Accompanying drawing explanation
Fig. 1 is the MnO-SiO of synthesis slag charge of the present invention
2it is state graph.
The relation of oxygen and titanium in molten steel when Fig. 2 is the 1873K of the embodiment of the present invention 1.
Equilibrium relationship when Fig. 3 is use silicon and the manganese deoxidation of the embodiment of the present invention 1.
Embodiment
Embodiment 1
Preparation synthesis slag charge:
1) with industrial manganese dioxide powder 40wt% ~ 50wt%, quartz sand 25wt% ~ 35wt%, rich manganese ore 20wt% ~ 25wt% for raw material, weigh batching, mixing;
2) by the mixing raw material of step 1) with temperature 1450 ~ 1550 DEG C of fritting, release in stove after fusing evenly, liquid slag come out of the stove after cooling;
3) will cool slag fragmentation processing, size is 1 ~ 20mm, obtained synthesis slag charge.
Above-mentioned obtained synthesis slag charge keeps dry state, and weather-proof dressing is stand-by, and the heat fused of pre-melted slag can use the method such as heated by gas, electrically heated.
Described raw material meets: industrial manganese dioxide powder comprises by mass percentage: MnO
2>75%, P<0.01%, S<0.04%; Described quartz sand comprises by mass percentage: SiO
2>90%, P<0.01%, S<0.04%; Described rich manganese ore comprises by mass percentage: MnO
245% ~ 55%, SiO
210% ~ 20%, Al
2o
35% ~ 15%, P<0.01%, S<0.04%.
For GCr15 bearing steel, after in oxidation, latter stage skims, whole high titanium ferrochrome is added in electric furnace, then silicomanganese pre-deoxidation is utilized, according to knowhow ferrosilicon, ferromanganese silicomanganese adjustment molten steel composition to Mn:0.3%, Si:0.15%, carry out adsorption and oxidation titanium with spray gun winding-up synthesis slag charge simultaneously and be mingled with, synthesis slag charge composition is: MnO is about 55%, SiO
2be about 45%, winding-up amount is 4 kgs/tonne of steel, carries out slag free tapping operation after winding-up, adds aluminium matter reductor (aluminium ferromanganese) 1.5 kgs/tonne of steel and calcium aluminate class synthetic slag 5 kgs/tonne of steel carry out deoxidation and removal is mingled with in tapping process with steel stream.
The relation of oxygen and titanium in molten steel when Fig. 2 is 1873K, ordinate is [Ti] content (mass percent, ppm).As shown in Figure 2, when in molten steel during [O] >=35ppm, [Ti]≤10ppm in molten steel, and in electric furnace oxidation molten steel in latter stage, [O] is about greater than 300ppm, so the titanium added latter stage in oxidation in the high titanium ferrochrome in electric furnace all can oxidation removal.
Equilibrium relationship when Fig. 3 is 1873K when silicon and manganese deoxidation.[Si] about 0.15% in control molten steel as seen from Figure 3, when [Mn] about 0.3%, in molten steel, [O] is about greater than 100ppm, as shown in Figure 3: be about 1ppm with [Ti] of 100ppm oxygen balance, so utilize silicomanganese pre-deoxidation can by the titanium oxidation removal in ferrosilicon, manganeseirom in electric furnace.
Embodiment 2
The preparation of synthesis slag charge is with embodiment 1.For GCr15 bearing steel, after in oxidation, latter stage skims, whole high titanium ferrochrome is added in electric furnace, then silicomanganese pre-deoxidation is utilized, according to knowhow ferrosilicon, ferromanganese silicomanganese adjustment molten steel composition to Mn:0.3%, Si:0.15%, carry out adsorption and oxidation titanium with spray gun winding-up synthesis slag charge to be mingled with simultaneously, namely synthesis slag charge is synthetic slag provided by the invention, and synthesis slag charge composition is: MnO is about 75%, SiO
2be about 25%, winding-up amount is 2 kgs/tonne of steel, carries out slag free tapping operation after winding-up, adds aluminium matter reductor (aluminium ferromanganese) 1.2 kgs/tonne of steel and calcium aluminate class synthetic slag 6 kgs/tonne of steel carry out deoxidation and removal is mingled with in tapping process with steel stream.Electric furnace steel tapping gets steel sample and ladle top slag analytical test after terminating 1 minute, be: 5ppm, the total oxygen value in molten steel is: 50ppm, and in ladle top slag, the mass percent of TiO2 is: 0.5% in molten steel containing [Ti].
Embodiment 3
The preparation of synthesis slag charge is with embodiment 1.For GCr15 bearing steel, after in oxidation, latter stage skims, whole high titanium ferrochrome is added in electric furnace, then silicomanganese pre-deoxidation is utilized, according to knowhow ferrosilicon, ferromanganese silicomanganese adjustment molten steel composition to Mn:0.3%, Si:0.15%, carry out adsorption and oxidation titanium with spray gun winding-up synthesis slag charge to be mingled with simultaneously, namely synthesis slag charge is synthetic slag provided by the invention, and synthesis slag charge composition is: MnO is about 65%, SiO
2be about 35%, winding-up amount is 5 kgs/tonne of steel, carries out slag free tapping operation after winding-up, adds aluminium matter reductor (steel-core-aluminium) 1.8 kgs/tonne of steel and calcium aluminate class synthetic slag 6 kgs/tonne of steel carry out deoxidation and removal is mingled with in tapping process with steel stream.Electric furnace steel tapping gets steel sample and ladle top slag analytical test after terminating 1 minute, be: 6ppm, the total oxygen value in molten steel is: 45ppm, and in ladle top slag, the mass percent of TiO2 is: 0.4% in molten steel containing [Ti].
Certainly; the present invention can also have various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can openly make various corresponding change and modification according to of the present invention, but these change accordingly and are out of shape the protection domain that all should belong to the claim appended by the present invention.
Claims (6)
1. remove a method for titanium in bearing steel molten steel, comprise the following steps:
1) after utilizing the oxidation of electrosmelting bearing steel to skim latter stage, high titanium ferrochrome is added in electric furnace;
2) utilize silicomanganese pre-deoxidation, the slag charge of winding-up synthesis simultaneously adsorption and oxidation titanium impurity, wherein, the composition of described synthesis slag charge comprises: the SiO of the MnO of 55wt% ~ 75wt%, 25wt% ~ 45wt%
2;
3) slag free tapping after winding-up synthesis slag charge, adds aluminium matter reductor with steel stream during tapping and calcium aluminate class synthetic slag carries out deoxidation and removes impurity.
2. the method for titanium in removal bearing steel molten steel according to claim 1, it is characterized in that, step 2) described silicomanganese pre-deoxidation step is composition with ferrosilicon and ferromanganese, or with silicomanganese adjustment molten steel composition to Mn content 0.1wt% ~ 0.4wt%, Si content 0.1wt% ~ 0.2wt%, the rate of recovery that wherein rate of recovery of Si gets 70%, Mn gets 85%.
3. the method for titanium in removal bearing steel molten steel according to claim 1, is characterized in that, step 2) preparation method of described synthesis slag charge comprises the following steps:
2-1) with industrial manganese dioxide powder 40wt% ~ 50wt%, quartz sand 25wt% ~ 35wt%, rich manganese ore 20wt% ~ 25wt% for raw material, weigh batching, mixing;
2-2) by step 2-1) mixing raw material with temperature 1450 ~ 1550 DEG C of fritting, release in stove after fusing evenly, liquid slag come out of the stove after cooling;
2-3) will cool slag fragmentation processing, size is 1 ~ 20mm, obtained synthesis slag charge.
4. the method for titanium in removal bearing steel molten steel according to claim 3, it is characterized in that, described industrial manganese dioxide powder comprises by mass percentage: MnO
2>75%, P<0.01%, S<0.04%; Described quartz sand comprises by mass percentage: SiO
2>90%, P<0.01%, S<0.04%; Described rich manganese ore comprises by mass percentage: MnO
245% ~ 55%, SiO
210% ~ 20%, Al
2o
35% ~ 15%, P<0.01%, S<0.04%.
5. the method for titanium in removal bearing steel molten steel according to claim 1, is characterized in that, step 2) amount of blowing of described synthesis slag charge is 2 ~ 5 kgs/tonne of steel.
6. the method for titanium in removal bearing steel molten steel according to claim 1, is characterized in that, step 3) described aluminium matter reductor is aluminium ferromanganese or steel-core-aluminium.
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| CN104212935B (en) * | 2014-08-22 | 2016-03-16 | 山东西王特钢有限公司 | A kind of method with high titanium ferrochrome production high-quality GCr15 bearing steel |
| CN111154946A (en) * | 2020-01-03 | 2020-05-15 | 大连环球矿产股份有限公司 | Multi-element premelted refining slag and production method and production device thereof |
Citations (5)
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| JPH06145883A (en) * | 1992-11-02 | 1994-05-27 | Daido Steel Co Ltd | High purity bearing steel and its production |
| CN1974828A (en) * | 2006-12-11 | 2007-06-06 | 四川川投峨眉铁合金（集团）有限责任公司 | Ultralow-titanium high-carbon ferrochromium alloy and production method thereof |
| CN101096740A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | Carbon steel double-roller thin-belt continuous metal cast process |
| CN102618675A (en) * | 2012-04-27 | 2012-08-01 | 四川省达州钢铁集团有限责任公司 | Slagging fusing assistant |
| CN103643056A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团研究院有限公司 | Smelting method of low-carbon ferromanganese |
-
2014
- 2014-04-03 CN CN201410133333.1A patent/CN103911486B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06145883A (en) * | 1992-11-02 | 1994-05-27 | Daido Steel Co Ltd | High purity bearing steel and its production |
| CN101096740A (en) * | 2006-06-28 | 2008-01-02 | 宝山钢铁股份有限公司 | Carbon steel double-roller thin-belt continuous metal cast process |
| CN1974828A (en) * | 2006-12-11 | 2007-06-06 | 四川川投峨眉铁合金（集团）有限责任公司 | Ultralow-titanium high-carbon ferrochromium alloy and production method thereof |
| CN102618675A (en) * | 2012-04-27 | 2012-08-01 | 四川省达州钢铁集团有限责任公司 | Slagging fusing assistant |
| CN103643056A (en) * | 2013-11-27 | 2014-03-19 | 攀钢集团研究院有限公司 | Smelting method of low-carbon ferromanganese |
Non-Patent Citations (1)
| Title |
|---|
| 高碳铬轴承钢中Ti含量的控制;郑少波等;《中国特殊钢年会2005论文集》;20050531;第145页第1.1节、第146页第1.2-1.3节、第147页第2.0节，表3 * |
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Inventor after: Wang Bo Inventor after: Li Meng Inventor after: Wu Bing Inventor after: Liu Mei Inventor after: Zhang Guanfeng Inventor after: Yang Zhou Inventor after: Wang Xiaopu Inventor after: Sun Yongxi Inventor after: Dong Hongzhuang Inventor after: Wang Feng Inventor after: Liu Hongyin Inventor after: Chen Wenda Inventor after: Wang Xueli Inventor after: Si Shengchun Inventor before: Wang Bo Inventor before: Yang Zhou Inventor before: Liu Hongyin Inventor before: Chen Wenda Inventor before: Sun Yongxi Inventor before: Wang Xueli Inventor before: Li Meng Inventor before: Wu Bing Inventor before: Liu Mei Inventor before: Zhang Guanfeng |
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