CN105886883A - Efficient inoculant, preparation method thereof and application of efficient inoculant in nodular cast iron - Google Patents
Efficient inoculant, preparation method thereof and application of efficient inoculant in nodular cast iron Download PDFInfo
- Publication number
- CN105886883A CN105886883A CN201610395287.1A CN201610395287A CN105886883A CN 105886883 A CN105886883 A CN 105886883A CN 201610395287 A CN201610395287 A CN 201610395287A CN 105886883 A CN105886883 A CN 105886883A
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- inovulant
- inoculant
- efficient
- preparation
- iron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/08—Making cast-iron alloys
- C22C33/10—Making cast-iron alloys including procedures for adding magnesium
-
- 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-iron
Abstract
The invention discloses efficient inoculant, a preparation method thereof and application of the efficient inoculant in nodular cast iron. The efficient inoculant is prepared from, by weight, 58-72% of Si, 0.8-3.2% of Zr, 1.2-2.5% of Nb, 2.8-5.5% of Ca, 1.85-3.58% of Ba, 0.015 or below of Mg, 0.2% or below of Al, 0.26% or below of Mn, 0.02% of below of S, 0.05% or below of P and the balance Fe. By means of the efficient inoculant, the inoculation effect is good, the number and density of spherulitic graphite are increased, graphite nucleation can be effectively promoted, chilling tendency is reduced, the spherulitic graphite size is reduced, the ingredient uniformity of inoculated cast iron is good, the melting point, intensity and performance are greatly improved, and the elongation and impact toughness of ferrite are improved.
Description
Technical field
The present invention relates to nodular cast iron inoculant technical field, be specifically related to effective inoculation agent and
Preparation method and in the application of spheroidal graphite cast-iron.
Background technology
Spheroidal graphite cast-iron is a kind of important engineering material, due to the mechanical property performance of spheroidal graphite cast-iron
Close to steel, many steel-castings and forged steel pieces are replaced by spheroidal graphite cast-iron, therefore, and spheroidal graphite cast-iron
Industrially obtain a wide range of applications.Want to reach good mechanical property, can use with
Lower method: heat treatment, alloying, inoculation.Wherein inoculation be comparison easy and
Method economic, effective, it not only promotes graphitization, prevents free cementite and spoken parts in traditional operas
Occur, and contribute to nodularization, make graphite become more tiny, more rounding, distribution is more uniform,
Thus improve the comprehensive mechanical property of G. Iron Castings.Its effect is that and changes cast iron eutectic crystallization
Curing condition, reaches to eliminate spoken parts in traditional operas, promote graphitization, crystal grain thinning, raising structural homogenity,
Thus improve mechanical property and the processability system of cast iron.
The inovulant of cast iron has carbon back and silica-based two classes, carbon-based incoculant have graphitizability strong,
The advantages such as decline is slow, but its fusing point is high, will process more than 1450 DEG C, and in production, use has
Difficulty, the most currently mainly with ferrosilicon as basic inovulant, commonly used in production be
75SiFe, but its pregnant effect is poor, for eliminating free cementite, needs addition relatively big, for
Control whole silicon amount, then must reduce the silicon amount of base iron, this application giving foundry returns and dispensing band
Carry out certain difficulty, the most seriously constrained the utilization rate to foundry returns in production process, cause
Foundry returns overstocks in a large number, causes the biggest waste to commercial production；It addition, 75SiFe's breeds
Decline rate is very fast, and thick strip or same foundry goods thickness major part are easily because cooling rate is slow, setting time is long
And make graphite nodule thick, distortion, even form compacted ink or chunky graphite, thus significantly reduce
Mechanical property.
For intensive inoculation effect, production is often added in inovulant a small amount of aluminum, calcium, strontium,
The element such as barium, rare earth, strengthens the pregnant effect of inovulant, the most often produces and expect not
The effect arrived, in prior art it has been reported that as Chinese invention patent (publication number:
CN101704070A) a kind of iron silicon lanthanum nucleating agent is related to.This inovulant by the Si of 70-75%,
The La of Al, 0.5-1.3% of Ba, 0.7-1.3% of Ca, 1.0-1.5% of 1.0-2.0%, surplus
Form for Fe.In the invention, adding a small amount of La element, La element belongs to kinetic super-cooling
Element, eliminates S, O plugging action at graphite nodule spiral growth dislocation mouth for deoxidation desulfuration,
Promote graphite nodule growth.The too high levels or too low of S, O, all will make structure of cast iron air chill,
But, sulfide, oxide are all substrate during graphite nodule forming core, especially sulfide
Thermodynamic stability is the highest, and its inoculation(effect) is the biggest, so sulfur is to promote to breed reaction smoothly
The indispensable composition carried out.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of effective inoculation agent, breeding of it
Effective, it is possible not only to effectively facilitate graphite forming core, reduces chilling tendency, increase the number of spheroidal graphite
Amount and density, say and laugh at spheroidal graphite size, moreover it is possible to make the homogeneity of ingredients breeding rear cast iron good, fusing point,
Dynamics, performance all have and significantly promote, and improve ferritic percentage elongation and impact flexibility.
For realizing object above, the present invention is achieved by the following technical programs:
A kind of effective inoculation agent, is made up of the material of following weight portion: Si 58-72%, Zr
0.8-3.2%, Nb 1.2-2.5%, Ca 2.8-5.5%, Ba 1.85-3.58%, Mg≤0.15%,
Al≤0.2%, Mn≤0.26%, S≤0.02%, P≤0.05%, surplus is ferrum.
Preferably, described effective inoculation agent, it is made up of the material of following weight portion: Si 60-65%,
Zr 1.5-2.8%, Nb 1.8-2.2%, Ca 3.8-5.0%, Ba 2.25-2.68%, Mg≤0.15%,
Al≤0.2%, Mn≤0.26%, S≤0.02%, P≤0.05%, surplus is ferrum.
The preparation method of a kind of effective inoculation agent, comprises the following steps:
(1) weigh Si, Zr, Nb, Ca, Ba, Mg, Al, Mn in mass ratio, put into
In electric furnace, it is passed through argon and gets rid of air, be then heated to 1480-1530 DEG C, melting 8-15min
After, obtain alloy solution, be subsequently adding ammonium hydrogencarbonate, after stirring, be cooled to room temperature,
Obtain the inovulant bulk of porosity and looseness；
(2) the inovulant bulk in step (1) is heated at 820-830 DEG C 90min, so
Rear stove is cooled to room temperature, then puts it into immersion 5-6 hour in saturated nacl aqueous solution, then pulverizes,
After grinding, obtain inoculant powder.
Preferably, the particle diameter of described inovulant is 10-20 micron.
Preferably, the dosage of described ammonium hydrogencarbonate is the 5-15% of alloy total amount.
The present invention also provides for effective inoculation agent application on spheroidal graphite cast-iron: uses and breeds for twice,
Breed first and at the bag end, the inovulant of iron water amount 0.12-0.16% covered on the surface of nodulizer,
Covering with steel plate above, late inoculation uses current-following inoculation.
Beneficial effects of the present invention: in inovulant of the present invention, element silicon can strongly facilitate graphitization,
Make foundry goods obtain ferrite and control ferritic content, make foundry goods will not cause volume at high temperature
Expand and make foundry goods destroy, and at high temperature promote that cast iron forms the silicon dioxide oxide-film of densification
Layer, effectively stops oxonium ion to invade to the infiltration of cast-internal, prevents from aoxidizing further, make casting
Part antioxidation growth performance is greatly improved；Niobium can promote the formation of spheroidal graphite；Ba can effectively promote
Enter graphitization, spheroidal graphite can be made again to refine, improve the mechanical property of cast iron, inhibition decline time；
Ca can reduce the surfusion of molten iron, the most also has deoxidation and neutralizes other excess trace element
Effect；S contributes to the formation of graphite crystal nucleus；The ammonium hydrogen carbonate added in inovulant, is entering
Enter generation decomposes in alloy solution, and produce bubble, thus obtain even structure, contain
The inovulant of the open structure of pore, makes inovulant easily be ground into uniform powder, this
Outward, it helps the thawing in molten iron when inovulant uses, the contact surface of its residual molten steel is increased
Long-pending, improve inoculation efficiency.The effective inoculation agent that the present invention provides, its pregnant effect is good, increases
Add quantity and the density of spheroidal graphite, be possible not only to effectively facilitate graphite forming core, reduce chilling tendency,
Reduce spheroidal graphite size, moreover it is possible to make the homogeneity of ingredients breeding rear cast iron good, fusing point, dynamics, property
Can all have and significantly promote, improve ferritic percentage elongation and impact flexibility.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below will knot
Close the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely retouched
State, it is clear that described embodiment is a part of embodiment of the present invention rather than whole realities
Execute example.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
Embodiment 1:
The preparation method of a kind of effective inoculation agent, comprises the following steps:
(1) weigh by weight 58%Si, 3.2%Zr, 1.2%Nb, 2.8%Ca, 2.25%
Ba, 0.15%Mg, 0.2%Al, 0.25%Mn, surplus is the pig iron, puts in electric furnace, logical
Enter argon and get rid of air, be then heated to 1480-1490 DEG C, after melting 8-15min, closed
Gold solution, is subsequently adding alloy total amount 5% ammonium hydrogencarbonate, after stirring, with 10 DEG C/min
Speed be cooled to room temperature, obtain the inovulant bulk of porosity and looseness；
(2) the inovulant bulk in step (1) is heated at 820-830 DEG C 90min, so
Rear stove is cooled to room temperature, then puts it into immersion 5-6 hour in saturated nacl aqueous solution, then pulverizes,
After grinding, obtain inoculant powder.
By the effective inoculation agent of the present embodiment application on spheroidal graphite cast-iron: use and breed for twice,
Breed first and at the bag end, the inovulant of iron water amount 0.12% is covered on the surface of nodulizer, use above
Steel plate covers, and late inoculation uses current-following inoculation.
Embodiment 2:
The preparation method of a kind of effective inoculation agent, comprises the following steps:
(1) weigh in mass ratio 60%Si, 2.8%Zr, 2.5%Nb, 2.8%Ca, 1.85%
Ba, 0.12%Mg, 0.05%Al, 0.26%Mn, surplus is the pig iron, puts in electric furnace, logical
Enter argon and get rid of air, be then heated to 1490-1500 DEG C, after melting 8-15min, closed
Gold solution, is subsequently adding alloy total amount 15% ammonium hydrogencarbonate, with 10 DEG C/min's after stirring
Speed is cooled to room temperature, obtains the inovulant bulk of porosity and looseness；
(2) the inovulant bulk in step (1) is heated at 820-830 DEG C 90min, so
Rear stove is cooled to room temperature, then puts it into immersion 5-6 hour in saturated nacl aqueous solution, then pulverizes,
After grinding, obtain inoculant powder.
By the effective inoculation agent of the present embodiment application on spheroidal graphite cast-iron: use and breed for twice,
Breed first and at the bag end, the inovulant of iron water amount 0.12% is covered on the surface of nodulizer, use above
Steel plate covers, and late inoculation uses current-following inoculation.
Embodiment 3:
The preparation method of a kind of effective inoculation agent, comprises the following steps:
(1) weigh in mass ratio 65%Si, 1.5%Zr, 2.2%Nb, 5.0%Ca, 2.68%
Ba, 0.15%Mg, 0.1%Al, 0.1%Mn, surplus is the pig iron, puts in electric furnace, is passed through
Argon gets rid of air, is then heated to 1500-1510 DEG C, after melting 8-15min, obtains alloy
Solution, is subsequently adding alloy total amount 8% ammonium hydrogencarbonate, after stirring, with 10 DEG C/min's
Speed is cooled to room temperature, obtains the inovulant bulk of porosity and looseness；
(2) the inovulant bulk in step (1) is heated at 820-830 DEG C 90min, so
Rear stove is cooled to room temperature, then puts it into immersion 5-6 hour in saturated nacl aqueous solution, then pulverizes,
After grinding, obtain inoculant powder.
By the effective inoculation agent of the present embodiment application on spheroidal graphite cast-iron: use and breed for twice,
Breed first and at the bag end, the inovulant of iron water amount 0.15% is covered on the surface of nodulizer, use above
Steel plate covers, and late inoculation uses current-following inoculation.
Embodiment 4:
The preparation method of a kind of effective inoculation agent, comprises the following steps:
(1) weigh in mass ratio 72%Si, 0.8%Zr, 1.8%Nb, 5.5%Ca, 3.58%
Ba, 0.1%Mg, 0.12%Al, put in electric furnace, and surplus is the pig iron, is passed through argon and gets rid of sky
Gas, is then heated to 1520-1530 DEG C, after melting 8-15min, obtains alloy solution, then
Add alloy total amount 10% ammonium hydrogencarbonate, after stirring, be cooled to the speed of 10 DEG C/min
Room temperature, obtains the inovulant bulk of porosity and looseness；
(2) the inovulant bulk in step (1) is heated at 820-830 DEG C 90min, so
Rear stove is cooled to room temperature, then puts it into immersion 5-6 hour in saturated nacl aqueous solution, then pulverizes,
After grinding, obtain inoculant powder.
By the effective inoculation agent of the present embodiment application on spheroidal graphite cast-iron: use and breed for twice,
Breed first and at the bag end, the inovulant of iron water amount 0.16% is covered on the surface of nodulizer, use above
Steel plate covers, and late inoculation uses current-following inoculation.
To sum up, the embodiment of the present invention has the advantages that the effective inoculation that the present invention provides
Agent, its pregnant effect is good, increases quantity and the density of spheroidal graphite, is possible not only to effectively facilitate stone
Ink forming core, reduces chilling tendency, reduces spheroidal graphite size, moreover it is possible to make the composition breeding rear cast iron equal
Even property is good, and fusing point, dynamics, performance all have and significantly promote, improve ferritic percentage elongation and
Impact flexibility.
It should be noted that in this article, the relational terms of such as first and second or the like is only
Only it is used for separating an entity or operation with another entity or operating space, and not necessarily
Require or imply and there is the relation of any this reality or suitable between these entities or operation
Sequence.And, term " includes ", " comprising " or its any other variant are intended to nonexcludability
Comprise, so that include the process of a series of key element, method, article or equipment not only
Including those key elements, but also include other key elements being not expressly set out, or also include
The key element intrinsic for this process, method, article or equipment.There is no more restriction
In the case of, statement " including ... " key element limited, it is not excluded that including described wanting
Process, method, article or the equipment of element there is also other identical element.
Above example only in order to technical scheme to be described, is not intended to limit；Although
With reference to previous embodiment, the present invention is described in detail, those of ordinary skill in the art
It is understood that the technical scheme described in foregoing embodiments still can be modified by it,
Or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, not
The essence making appropriate technical solution departs from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. an effective inoculation agent, it is characterised in that be made up of the material of following weight portion: Si
58-72%, Zr 0.8-3.2%, Nb 1.2-2.5%, Ca 2.8-5.5%, Ba 1.85-3.58%, Mg
≤ 0.15%, Al≤0.2%, Mn≤0.26%, S≤0.02%, P≤0.05%, surplus is ferrum.
2. effective inoculation agent as claimed in claim 1, it is characterised in that by following weight portion
Material composition: Si 60-65%, Zr 1.5-2.8%, Nb 1.8-2.2%, Ca 3.8-5.0%, Ba
2.25-2.68%, Mg≤0.15%, Al≤0.2%, Mn≤0.26%, S≤0.02%, P≤0.05%,
Surplus is ferrum.
3. a preparation method for effective inoculation agent as claimed in claim 1 or 2, its feature
It is, comprises the following steps:
(1) weigh Si, Zr, Nb, Ca, Ba, Mg, Al, Mn in mass ratio, put into
In electric furnace, it is passed through argon and gets rid of air, be then heated to 1480-1530 DEG C, melting 8-15min
After, obtain alloy solution, be subsequently adding ammonium hydrogencarbonate, after stirring, be cooled to room temperature,
Obtain the inovulant bulk of porosity and looseness；
(2) the inovulant bulk in step (1) is heated at 820-830 DEG C 90min, so
Rear stove is cooled to room temperature, then puts it into immersion 5-6 hour in saturated nacl aqueous solution, then pulverizes,
After grinding, obtain inoculant powder.
4. the preparation method of effective inoculation agent as claimed in claim 3, it is characterised in that institute
The particle diameter stating inovulant is 10-20 micron.
5. the preparation method of effective inoculation agent as claimed in claim 4, it is characterised in that institute
State the 5-15% that dosage is alloy total amount of ammonium hydrogencarbonate.
6. a effective inoculation agent as claimed in claim 1 or 2 application on spheroidal graphite cast-iron,
It is characterized in that, use and breed for twice, breed iron water amount 0.12-0.16%'s first at the bag end
Inovulant covers on the surface of nodulizer, covers with steel plate above, and late inoculation uses with stream pregnant
Educate.
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|---|---|---|---|
| CN201610395287.1A CN105886883B (en) | 2016-05-31 | 2016-05-31 | Inovulant and preparation method thereof and the application in spheroidal graphite cast-iron |
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| CN201610395287.1A CN105886883B (en) | 2016-05-31 | 2016-05-31 | Inovulant and preparation method thereof and the application in spheroidal graphite cast-iron |
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| CN105886883B CN105886883B (en) | 2017-08-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108796359A (en) * | 2018-07-16 | 2018-11-13 | 佛山市高明康得球铁有限公司 | A kind of spheroidal graphite cast-iron of high-wear resistance |
| CN109136729A (en) * | 2018-07-16 | 2019-01-04 | 佛山市高明康得球铁有限公司 | A kind of preparation method of the spheroidal graphite cast-iron of high-wear resistance |
| CN110438280A (en) * | 2019-09-11 | 2019-11-12 | 武汉工控艺术制造有限公司 | A kind of high strength synthetic cast iron inovulant and preparation method thereof |
| CN114250405A (en) * | 2021-12-13 | 2022-03-29 | 广西大学 | Preparation method of gray cast iron inoculant |
| WO2022211640A1 (en) * | 2021-03-30 | 2022-10-06 | Elkem Asa | Ferrosilicon vanadium and/or niobium alloy, production of a ferrosilicon vanadium and/or niobium alloy, and the use thereof |
| WO2022211641A1 (en) * | 2021-03-30 | 2022-10-06 | Elkem Asa | Ferrosilicon vanadium and/or niobium alloy, production of a ferrosilicon vanadium and/or niobium alloy, and the use thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108796359A (en) * | 2018-07-16 | 2018-11-13 | 佛山市高明康得球铁有限公司 | A kind of spheroidal graphite cast-iron of high-wear resistance |
| CN109136729A (en) * | 2018-07-16 | 2019-01-04 | 佛山市高明康得球铁有限公司 | A kind of preparation method of the spheroidal graphite cast-iron of high-wear resistance |
| CN110438280A (en) * | 2019-09-11 | 2019-11-12 | 武汉工控艺术制造有限公司 | A kind of high strength synthetic cast iron inovulant and preparation method thereof |
| WO2022211640A1 (en) * | 2021-03-30 | 2022-10-06 | Elkem Asa | Ferrosilicon vanadium and/or niobium alloy, production of a ferrosilicon vanadium and/or niobium alloy, and the use thereof |
| WO2022211641A1 (en) * | 2021-03-30 | 2022-10-06 | Elkem Asa | Ferrosilicon vanadium and/or niobium alloy, production of a ferrosilicon vanadium and/or niobium alloy, and the use thereof |
| TWI825639B (en) * | 2021-03-30 | 2023-12-11 | 挪威商艾爾坎股份有限公司 | Ferrosilicon vanadium and/or niobium alloy, production of a ferrosilicon vanadium and/or niobium alloy, and the use thereof |
| CN114250405A (en) * | 2021-12-13 | 2022-03-29 | 广西大学 | Preparation method of gray cast iron inoculant |
| CN114250405B (en) * | 2021-12-13 | 2022-09-13 | 广西大学 | Preparation method of gray cast iron inoculant |
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