CN107419059A - A kind of preparation method of molten-steel deoxidation agent - Google Patents
A kind of preparation method of molten-steel deoxidation agent Download PDFInfo
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- CN107419059A CN107419059A CN201710503550.9A CN201710503550A CN107419059A CN 107419059 A CN107419059 A CN 107419059A CN 201710503550 A CN201710503550 A CN 201710503550A CN 107419059 A CN107419059 A CN 107419059A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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Abstract
The present invention relates to a kind of preparation method of molten-steel deoxidation agent, belong to iron and steel smelting technology field.The present invention mixes lanthana and boron powder, after ball milling sieving, blank is suppressed to obtain, room temperature is cooled to after blank is calcined, broken and ball milling, modified powder is obtained, then A00 aluminium, manganese metal powder and manganese chloride are melted, obtains alloy melt, modified powder is added in alloy melt and is stirred, after heating melts and is segmented cooling processing, room temperature is cooled to, crushes simultaneously ball milling sieving.The present invention prepares alloy material by the way that manganese and aluminium are compound, it is consistent with molten steel density, after putting into steel, ascent rate is substantially reduced, and the alloy material for having little time dissolving is suspended in molten steel, and its first half may be by slag oxidation, and lower half may continue to be suspended in molten steel and carry out deoxidation treatment, recovery rate of iron is effectively improved, while molten steel material simultaneously, is improved the performance of steel in deoxidation.
Description
Technical field
The present invention relates to a kind of preparation method of molten-steel deoxidation agent, belong to iron and steel smelting technology field.
Background technology
With increasingly raising of the continuous progress and market of metallurgical technology to steel products quality requirement, some special steels
Kind is very strict to the quantity and morphological requirements of nonmetallic inclusionsin steel.Experiment shows, when oxygen in steel
Mass fraction by 30 × 10-6It is reduced to 10 × 10-6When following, its contact fatigue life can improve nearly 30 times, greatly
The performance of steel is improved, therefore, the content of oxygen in steel how is reduced, improves the degree of purity of steel, be just particularly important.
Deoxidier used in production mainly includes the conventional deoxidiers and Al-Mg, Si- such as ferromanganese, ferrosilicon, aluminium at present
The double deoxidizers such as Ca-Ba, Si-Al-Fe, Si-Al-Ba-Fe, RE-Al-Fe, some steel mills are also taken off using synthetic slag
Oxygen.Wherein, aluminium is because deoxidizing capacity is strong, the reasons such as use cost is low, is still a kind of current the most widely used deoxidier, but
There is certain limitation with aluminium deoxidation.First, the proportion of aluminium in itself is lighter, during adding molten steel and carrying out deoxidation, easily
Molten steel surface is floated to, causes that the scaling loss of aluminium is serious, and recovery rate of iron is low；Secondly as a large amount of scaling loss of aluminium so that aluminium deoxidation
Utilization rate it is also low；Again, the deoxidation products Al of deoxidation is carried out with aluminium2O3It is more in steel to be distributed in water caltrop shape, it is not easy from molten steel
Exclude, influence processing and the performance of steel, deteriorate steel product quality.
It would therefore be highly desirable to find a kind of deoxidation effectiveness height, steel product quality, and the steel with higher recovery rate of iron are not influenceed
Water deoxygenation agent.
The content of the invention
The technical problems to be solved by the invention：It is low for existing deoxidier utilization rate, its deoxidation effectiveness is reduced, simultaneously
After deoxidation, metal recovery rate, and the problem of be degrading the quality of steel, there is provided a kind of preparation method of molten-steel deoxidation agent.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
（1）In mass ratio 1:10, lanthana and boron powder are mixed, ball milling sieves to obtain ball-milled powder, collects ball-milled powder and is placed in
In mould, blank is suppressed to obtain, blank is placed in tube-type atmosphere furnace, stood after insulation calcining and be cooled to room temperature, crush simultaneously ball milling,
Obtain modified powder；
（2）Count in parts by weight, take 100~120 parts of A00 aluminium, 3~5 parts of manganese metal powder and 0.1~0.5 part of manganese chloride juxtaposition
In graphite crucible, insulation melts to obtain alloy melt, in mass ratio 1:30, modified powder is added in alloy melt,
It is stirred 10~15min；
（3）After the completion of to be mixed, 1500~1600 DEG C are warming up to, insulation melts and is segmented cooling processing, after insulation is stood, stops
Heat and stand and be cooled to room temperature, crush and ball milling sieves, you can be prepared into a kind of molten-steel deoxidation agent.
Step（1）Described pressing conditions is that 1~2min is suppressed under the conditions of room temperature, 25~30MPa.
Step（1）Described calcination condition is under an argon atmosphere, 1500~1600 DEG C to be warming up to by 10 DEG C/min.
Step（1）Described grit number of crossing is 500 mesh.
Step（2）Described manganese metal powder diameter is 200 mesh.
Step（3）Described segmentation cooling processing is to be cooled by 10 DEG C/min to 500 DEG C, insulation standing 25~
After 30min, then by 5 DEG C/min it is cooled to 300 DEG C, insulation stands 1~2h.
Compared with other method, advantageous effects are the present invention：
（1）The present invention prepares alloy material by the way that manganese and aluminium are compound, and density is high, is consistent with molten steel density, after putting into steel, on
Floating speed substantially reduces, and have little time dissolving alloy material be suspended in molten steel, its first half may by slag oxidation, and under
Half portion, which may continue to be suspended in molten steel, carries out deoxidation treatment, recovery rate of iron is effectively improved, simultaneously because being melted while aluminium manganese
Solution and deoxygenation, surrounding form a Fu Meng area centered on aluminium ferromanganese, and the presence in Fu Meng areas not only substantially increases aluminium
Activity, the balance oxygen concentration of corresponding aluminum concentration is reduced, improves the deoxidizing capacity of dissolving aluminium, and change aluminium deoxidation product
Property, make aluminium deoxidation react free enthalpy reduce, promote the generation, polymerization, exclusion of deoxidation products；
（2）The present invention is by the introducing of rare earth lanthanum element, and boron is compound is added in molten steel, and boron, can as excellent deoxidier
Effective deoxidation simultaneously makes molten steel material simultaneously, effectively facilitate the generation of intragranular acicular ferrite in steel, molten steel cooling procedure in deoxidation
The heterogeneous forming core core of middle Intragranular Acicular Ferrite promotes forming core, suppresses growing up for austenite crystal and carrys out crystal grain thinning, so as to improve steel
Obdurability, while can aluminum oxide deoxidation products surface formed clad structure, be effectively improved angled shape deoxidation products production
It is raw, be advantageous to the exclusion of deoxidation products, further improve the performance of steel.
Embodiment
In mass ratio 1:10, lanthana and boron powder are mixed, vacuum drying is placed in ball grinder, in 550~600r/
3~5h of ball milling under min, cross 200 mesh sieves and obtain ball-milled powder, collect ball-milled powder and be placed in mould, in room temperature, 25~30MPa
Under the conditions of suppress 1~2min after, obtain blank, blank be placed in tube-type atmosphere furnace, lead to argon gas exclude air, in argon gas atmosphere
Under, 1500~1600 DEG C are warming up to by 10 DEG C/min, is stood after insulation calcining and is cooled to room temperature, broken and ball milling crosses 500 mesh sieves,
Obtain modified powder；Take manganese metal and ball milling crosses 200 mesh sieves and obtains manganese metal powder, count in parts by weight, take 100~120 parts of A00
Aluminium, 3~5 parts of manganese metal powder and 0.1~0.5 part of manganese chloride are placed in graphite crucible, and melting is incubated at 900~1000 DEG C
Alloy melt, then in mass ratio 1:30, modified powder is added in alloy melt, and is stirred with globar
10~15min, then it is warming up to 1500~1600 DEG C by 20 DEG C/min, after 25~30min of isothermal holding, cool down and drop by 10 DEG C/min
Temperature is incubated after standing 25~30min to 500 DEG C, then is cooled to 300 DEG C, after insulation stands 1~2h by 5 DEG C/min, stops heating
And stand and be cooled to room temperature, a kind of broken to be placed in ball grinder, ground 100 mesh sieve, you can be prepared into molten-steel deoxidation agent.
Example 1
In mass ratio 1:10, lanthana and boron powder are mixed, vacuum drying is placed in ball grinder, the ball milling under 600r/min
5h, cross 200 mesh sieves and obtain ball-milled powder, collect ball-milled powder and be placed in mould, after suppressing 2min under the conditions of room temperature, 30MPa,
Blank is obtained, blank is placed in tube-type atmosphere furnace, leads to argon gas and excludes air, under an argon atmosphere, be warming up to by 10 DEG C/min
1600 DEG C, stood after insulation calcining and be cooled to room temperature, broken and ball milling crosses 500 mesh sieves, obtains modified powder；Take manganese metal and ball milling
Cross 200 mesh sieves and obtain manganese metal powder, count in parts by weight, take 120 parts of A00 aluminium, 5 parts of manganese metal powder and 0.5 part of manganese chloride simultaneously
Be placed in graphite crucible, at 1000 DEG C insulation melt to obtain alloy melt, then in mass ratio 1:30, modified powder is added
15min is stirred into alloy melt, and with globar, then 1600 DEG C are warming up to by 20 DEG C/min, isothermal holding 30min
Afterwards, cool to 500 DEG C, be incubated after standing 30min by 10 DEG C/min, then 300 DEG C are cooled to by 5 DEG C/min, insulation is stood
After 2h, stop heating and standing being cooled to room temperature, broken to be placed in ball grinder, ground 100 mesh sieve, you can be prepared into one kind
Molten-steel deoxidation agent.
Example 2
In mass ratio 1:10, lanthana and boron powder are mixed, vacuum drying is placed in ball grinder, the ball milling under 550r/min
3h, cross 200 mesh sieves and obtain ball-milled powder, collect ball-milled powder and be placed in mould, after suppressing 1min under the conditions of room temperature, 25MPa,
Blank is obtained, blank is placed in tube-type atmosphere furnace, leads to argon gas and excludes air, under an argon atmosphere, be warming up to by 10 DEG C/min
1500 DEG C, stood after insulation calcining and be cooled to room temperature, broken and ball milling crosses 500 mesh sieves, obtains modified powder；Take manganese metal and ball milling
Cross 200 mesh sieves and obtain manganese metal powder, count in parts by weight, take 100 parts of A00 aluminium, 3 parts of manganese metal powder and 0.1 part of manganese chloride simultaneously
Be placed in graphite crucible, at 900 DEG C insulation melt to obtain alloy melt, then in mass ratio 1:30, modified powder is added
10min is stirred into alloy melt, and with globar, then 1500 DEG C are warming up to by 20 DEG C/min, isothermal holding 25min
Afterwards, cool to 500 DEG C, be incubated after standing 25min by 10 DEG C/min, then 300 DEG C are cooled to by 5 DEG C/min, insulation is stood
After 1h, stop heating and standing being cooled to room temperature, broken to be placed in ball grinder, ground 100 mesh sieve, you can be prepared into one kind
Molten-steel deoxidation agent.
Example 3
In mass ratio 1:10, lanthana and boron powder are mixed, vacuum drying is placed in ball grinder, the ball milling under 570r/min
4h, cross 200 mesh sieves and obtain ball-milled powder, collect ball-milled powder and be placed in mould, after suppressing 1min under the conditions of room temperature, 27MPa,
Blank is obtained, blank is placed in tube-type atmosphere furnace, leads to argon gas and excludes air, under an argon atmosphere, be warming up to by 10 DEG C/min
1550 DEG C, stood after insulation calcining and be cooled to room temperature, broken and ball milling crosses 500 mesh sieves, obtains modified powder；Take manganese metal and ball milling
Cross 200 mesh sieves and obtain manganese metal powder, count in parts by weight, take 110 parts of A00 aluminium, 4 parts of manganese metal powder and 0.3 part of manganese chloride simultaneously
Be placed in graphite crucible, at 950 DEG C insulation melt to obtain alloy melt, then in mass ratio 1:30, modified powder is added
12min is stirred into alloy melt, and with globar, then 1550 DEG C are warming up to by 20 DEG C/min, isothermal holding 27min
Afterwards, cool to 500 DEG C, be incubated after standing 27min by 10 DEG C/min, then 300 DEG C are cooled to by 5 DEG C/min, insulation is stood
After 2h, stop heating and standing being cooled to room temperature, broken to be placed in ball grinder, ground 100 mesh sieve, you can be prepared into one kind
Molten-steel deoxidation agent.
Reference examples：The molten-steel deoxidation agent of the metallurgical Nai Cai Co., Ltds production in Henan.
Example and the molten-steel deoxidation agent of reference examples are applied in molten steel, in 20min before liquid steel refining terminates, added de-
Oxygen agent, 1.2kg is added in molten steel per ton, and it is 1600 DEG C to control the temperature of molten steel, and after addition terminates, mixing is stirred to it
15min, to ensure that deoxidier is evenly distributed on molten steel, using activity oxygen content after molten steel apparatus for determination of oxygen measure deoxidation of molten steel, and
After deoxidation terminates, by smelting molten steel Cheng Gang, the rate of recovery of aluminium and the intensity of steel in steel, specific testing result such as table 1 are determined.
Table 1
As shown in Table 1, the molten-steel deoxidation agent deoxidation effect that prepared by the present invention is high, and aluminium recovery is high, and improves the quality of steel.
Claims (6)
1. a kind of preparation method of molten-steel deoxidation agent, it is characterised in that specifically preparation process is：
（1）In mass ratio 1:10, lanthana and boron powder are mixed, ball milling sieves to obtain ball-milled powder, collects ball-milled powder and is placed in
In mould, blank is suppressed to obtain, blank is placed in tube-type atmosphere furnace, stood after insulation calcining and be cooled to room temperature, crush simultaneously ball milling,
Obtain modified powder；
（2）Count in parts by weight, take 100~120 parts of A00 aluminium, 3~5 parts of manganese metal powder and 0.1~0.5 part of manganese chloride juxtaposition
In graphite crucible, insulation melts to obtain alloy melt, in mass ratio 1:30, modified powder is added in alloy melt,
It is stirred 10~15min；
（3）After the completion of to be mixed, 1500~1600 DEG C are warming up to, insulation melts and is segmented cooling processing, after insulation is stood, stops
Heat and stand and be cooled to room temperature, crush and ball milling sieves, you can be prepared into a kind of molten-steel deoxidation agent.
A kind of 2. preparation method of molten-steel deoxidation agent according to claim 1, it is characterised in that：Step（1）Described pressure
Condition processed is that 1~2min is suppressed under the conditions of room temperature, 25~30MPa.
A kind of 3. preparation method of molten-steel deoxidation agent according to claim 1, it is characterised in that：Step（1）Described forges
Burning condition is under an argon atmosphere, 1500~1600 DEG C to be warming up to by 10 DEG C/min.
A kind of 4. preparation method of molten-steel deoxidation agent according to claim 1, it is characterised in that：Step（1）Described mistake
Grit number is 500 mesh.
A kind of 5. preparation method of molten-steel deoxidation agent according to claim 1, it is characterised in that：Step（2）Described gold
It is 200 mesh to belong to manganese powder diameter.
A kind of 6. preparation method of molten-steel deoxidation agent according to claim 1, it is characterised in that：Step（3）Described point
Duan Jiangwen processing is incubated after standing 25~30min, then be cooled to by 5 DEG C/min to be cooled by 10 DEG C/min to 500 DEG C
300 DEG C, insulation stands 1~2h.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115121787A (en) * | 2021-10-20 | 2022-09-30 | 杭州屹通新材料股份有限公司 | Water atomized ferroboron powder and preparation method thereof |
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| CN1160087A (en) * | 1996-03-18 | 1997-09-24 | 张毅鸣 | Rare-earth-Al-Mn alloy |
| CN101078074A (en) * | 2007-07-14 | 2007-11-28 | 包头市神润特种合金股份有限公司 | Rare earth aluminum iron alloy |
| CN101775464A (en) * | 2010-04-07 | 2010-07-14 | 朝阳鸿翔冶炼有限公司 | Micro carbon micro phosphorus aluminum manganese iron alloy as well as production method thereof |
| CN101818230A (en) * | 2009-02-27 | 2010-09-01 | 鞍钢股份有限公司 | Manganese boron deoxidizer and using method thereof |
-
2017
- 2017-06-27 CN CN201710503550.9A patent/CN107419059A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1160087A (en) * | 1996-03-18 | 1997-09-24 | 张毅鸣 | Rare-earth-Al-Mn alloy |
| CN101078074A (en) * | 2007-07-14 | 2007-11-28 | 包头市神润特种合金股份有限公司 | Rare earth aluminum iron alloy |
| CN101818230A (en) * | 2009-02-27 | 2010-09-01 | 鞍钢股份有限公司 | Manganese boron deoxidizer and using method thereof |
| CN101775464A (en) * | 2010-04-07 | 2010-07-14 | 朝阳鸿翔冶炼有限公司 | Micro carbon micro phosphorus aluminum manganese iron alloy as well as production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115121787A (en) * | 2021-10-20 | 2022-09-30 | 杭州屹通新材料股份有限公司 | Water atomized ferroboron powder and preparation method thereof |
| CN115121787B (en) * | 2021-10-20 | 2024-04-19 | 杭州屹通新材料股份有限公司 | Water atomization ferroboron powder and preparation method thereof |
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Application publication date: 20171201 |