CN105220059B - A kind of preparation method and applications of spheroidal graphite cast-iron inovulant - Google Patents
A kind of preparation method and applications of spheroidal graphite cast-iron inovulant Download PDFInfo
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- CN105220059B CN105220059B CN201510731576.XA CN201510731576A CN105220059B CN 105220059 B CN105220059 B CN 105220059B CN 201510731576 A CN201510731576 A CN 201510731576A CN 105220059 B CN105220059 B CN 105220059B
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Abstract
The invention discloses a kind of preparation method of spheroidal graphite cast-iron inovulant, comprise the following steps：By well mixed Si：66~72%, Ba：3~10%, Ca：1~2%, Al：0.8~1.8%, Ce：1.5~2%, S：0~1%, carburant：0.5~1% and surplus be Fe and inevitably trace element, it is smelting, stir, pour, quickly cooling, crushing, remix Fe3O4Powder, compacting is agglomerating to crush again.The invention also discloses the application of the spheroidal graphite cast-iron inovulant.The spheroidal graphite cast-iron inovulant provided using the present invention, can improve the combination property of spheroidal graphite cast-iron, and improve inoculation efficiency.
Description
Technical field
The present invention relates to casting iron field, more particularly to a kind of preparation method of spheroidal graphite cast-iron inovulant, and it is in ball
The application of black casting iron field.
Background technology
Inovulant, which has, can promote graphitization, reduce chilling tendency, improve graphite form and distribution situation, increase Eutectic Cell Number
Amount, refines matrix, makes Graphite Particles in Spheroidal Graphite Cast Iron rounding, reduce or eliminate Quench, prevent the formation of surface free cementite, uniform group
Knit, the advantages of improving mechanical property, it has obtained widely applying in casting iron field.
Spheroidal graphite cast-iron is to obtain globular graphite by nodularization and inoculation, is effectively improved the mechanical performance of cast iron,
Plasticity and toughness are in particular improved, so as to obtain than carbon steel also high intensity.Spheroidal graphite cast-iron is nineteen fifties hair
A kind of high-strength cast iron material that exhibition is got up, its combination property is based on its excellent performance, successfully used close to steel
In casting, some stress are complicated, and intensity, toughness, wearability require higher part.Spheroidal graphite cast-iron has developed rapidly to be only second to
Gray cast iron, using quite varied cast iron materials.
At present, most of manufacturers use 75 silicon iron inoculators as inovulant and produce spheroidal graphite cast-iron, but these are produced
Product have that the incubation time is short, worn no resistance, hardness is low, and tensile strength is low, section is uneven, and the shortcomings of being also easy to produce spoken parts in traditional operas is caused
Product is unstable, it is impossible to meet the requirement of the machinery casting of some needs high rigidity.
In order to improve above-mentioned deficiency, part producer start to increase in silicon iron inoculator other materials prepare it is compound inoculated
Agent, such as chromium, rare earth, however, when adding above-mentioned material, the problem of introducing new will such as increase the several of white structure formation
Rate, and then cause spheroidal graphite cast-iron hardness to decline.
The content of the invention
The purpose of the present invention is there is above mentioned problem for existing technology, it is proposed that a kind of pregnant effect is good, after breeding
The preparation method for the spheroidal graphite cast-iron inovulant that the product composition uniformity, fusing point, granularity, the performance of cast iron are greatly improved.
Another object of the present invention is to provide application of the above-mentioned spheroidal graphite cast-iron inovulant in terms of casting.
To reach above-mentioned purpose, the present invention takes following technical scheme：
A kind of preparation method of spheroidal graphite cast-iron inovulant comprises the following steps：
(1) 66~72% Si, 3~10% Ba, 1~2% Ca, 0.8~1.8% Al, 1.5 by mass percentage
~2% Ce, 0~1% S, 0.5~1% carburant and surplus are Fe and inevitably trace element is well mixed
After be put into vacuum electric furnace, replace furnace air with argon gas, be warming up to 1300 DEG C to 1500 DEG C, 5~10min of melting, melting
During do not stop stirring, make raw material be well mixed；Pour into a mould in a reservoir, and container is placed in liquid nitrogen, make alloy raw material rapid
Room temperature is cooled to, block is ground into the alloy powder that average grain diameter is 10~30 μm；
(2) it is 0.5~1.5% in 10~30 μm of percentage by weight by obtained above-mentioned alloy powder and average grain diameter
Fe3O4Powder is added in stainless steel, is well mixed rear and alloy powder and Fe3O4The silicic acid of powder gross weight 3~5%
Magnesium solution is added in rolling device together suppresses agglomerating, is ground into average grain diameter for 50~100 μm.
Further, the mass percent of the S is 0.4~0.6%.
Further, the carburant is casting carburant, and its component includes by mass percentage：C：99%th, S：0.4、
Moisture：0.2%, granularity is 0.2~1mm.
Application of the above-mentioned spheroidal graphite cast-iron inovulant in spheroidal graphite cast-iron, required cast iron is obtained by three inoculations；
Three parts will be uniformly divided into relative to the inovulant of molten steel quality fraction 0.2~0.6%, and wrapped into respectively in aluminium foil,
It is preheated to 300~400 DEG C；
First time inoculation：First part of inovulant is added in container；
Second of inoculation：When the molten iron for entering container highly reaches 1/2nd, second part of inovulant is added；
Third time inoculation：Continue pouring molten iron, the 3rd part of inovulant is added with molten iron, third time is carried out to it and is bred
Processing.
Further, add molten iron into container first and the time control of molten iron is filled with into container within 10min.
Further, the temperature of the molten iron is 1400~1600 DEG C.
Further, molten iron is stirred after third time inoculation, breeds 1~2 hour, and temperature is maintained at
1000~1200 DEG C.
Further, breed after end, 500~600 DEG C are rapidly cooled under liquid nitrogen environment, take out casting, be air-cooled to room
Temperature.
The above-mentioned spheroidal graphite cast-iron that the present invention is provided is had the advantages that with inovulant technical scheme：Si, Al suppress pregnant
Decline is educated, chilling tendency is prevented；Ba can effectively facilitate graphitization, can refine spheroidal graphite again, improve the mechanical property of magnesium iron, suppression
Fall time processed；Ca and Ce can reduce the surfusion of molten iron as far as possible, while neutralizing anti-graphitization trace element；S is helped
In the formation of graphite crystal nucleus；By adding carburant casting can be made to reach higher tensile strength；Fe3O4Eutectic can be increased
Check figure, can be obtained in the case where inovulant addition is low preferably suppress cementite ability, and improve fidelity factor and
Stability, extends the incubation time；The inovulant cooled down rapidly, its crystal grain is easier to refinement；Refinement inovulant particle (50~
100 μm) it can be dispersed in molten iron, increase the contact area of its residual molten steel, improve inoculation efficiency；Bred with aluminium foil parcel
Agent can make inovulant be uniformly dispersed, and prevent the Al in inoculation fade, aluminium foil also to reduce the possibility of spoken parts in traditional operas and pin hole formation；
Incubation time is long, can reduce nucleation ability, and to prevent the decline of inovulant, the time control bred is within 2h.
Embodiment
With reference to specific embodiment, the invention will be further described.
Embodiment 1 (prepares inovulant)
By weight percentage 66% Si, 10% Ba, 2% Ca, 1.8% Al, 1.5% Ce, 1% S,
It is put into after 0.5% carburant and 17.2% Fe are well mixed in vacuum electric furnace, replaces furnace air with argon gas, be warming up to
1300 DEG C, melting 5min does not stop stirring during melting, be well mixed raw material；Pour into a mould in a reservoir, and container is placed in
In liquid nitrogen, alloy raw material is rapidly cooled to room temperature, form block, block is ground into the alloyed powder that average grain diameter is 10 μm
End；The Fe for being 1.5% in 10 μm of percentage by weight by obtained above-mentioned alloy powder and average grain diameter3O4Powder is added to
In stainless steel, rear and alloy powder and Fe are well mixed3O4The sodium silicate solution of powder gross weight 5% is added to together to roll
Suppress agglomerating in device, be finally ground into average grain diameter for 50 μm.Wherein, the component of carburant includes：C：99%th, S：0.4th, water
Point：0.2%, granularity is 0.2~1mm.
Embodiment 2 (prepares inovulant)
By weight percentage 72% Si, 3% Ba, 1% Ca, 0.8% Al, 2% Ce, 1% carburant
And 20.2% Fe it is well mixed after be put into vacuum electric furnace, replace furnace air with argon gas, be warming up to 1500 DEG C, melting
10min, does not stop stirring during melting, be well mixed raw material；Pour into a mould in a reservoir, and container is placed in liquid nitrogen, make
Alloy raw material is rapidly cooled to room temperature, forms block, and block is ground into the alloy powder that average grain diameter is 30 μm；By what is obtained
The Fe that above-mentioned alloy powder and average grain diameter are 0.5% in 30 μm of percentage by weight3O4Powder is added in stainless steel,
Well mixed rear and alloy powder and Fe3O4The sodium silicate solution of powder gross weight 3% is added in rolling device together to be pressed into
Group, is finally ground into average grain diameter for 100 μm.Wherein, the component of carburant includes：C：99%th, S：0.4th, moisture：0.2%, grain
Spend for 0.2~1mm.
Embodiment 3 (prepares inovulant)
By weight percentage 68% Si, 8% Ba, 1.6% Ca, 1% Al, 1.6% Ce, 0.8% S,
It is put into after 0.6% carburant and 18.4% Fe are well mixed in vacuum electric furnace, replaces furnace air with argon gas, be warming up to
1400 DEG C, melting 6min does not stop stirring during melting, be well mixed raw material；Pour into a mould in a reservoir, and container is placed in
In liquid nitrogen, alloy raw material is rapidly cooled to room temperature, form block, block is ground into the alloyed powder that average grain diameter is 20 μm
End；The Fe for being 1% in 20 μm of percentage by weight by obtained above-mentioned alloy powder and average grain diameter3O4Powder is added to mixed
Close in container, be well mixed rear and alloy powder and Fe3O4The sodium silicate solution of powder gross weight 3% is added to together rolls dress
Put middle compacting agglomerating, be finally ground into average grain diameter for 60 μm.Wherein, the component of carburant includes：C：99%th, S：0.4th, water
Point：0.2%, granularity is 0.2~1mm.
Embodiment 4 (prepares inovulant)
By weight percentage 70% Si's, 5% Ba, 1.4% Ca, 1.4% Al, 1.8% Ce, 0.2%
It is put into after S, 0.8% carburant and 19.4% Fe are well mixed in vacuum electric furnace, furnace air, heating is replaced with argon gas
To 1400 DEG C, melting 8min does not stop stirring during melting, be well mixed raw material；Pour into a mould in a reservoir, and container is put
In liquid nitrogen, alloy raw material is rapidly cooled to room temperature, form block, block is ground into the alloyed powder that average grain diameter is 20 μm
End；The Fe for being 0.5% in 20 μm of percentage by weight by obtained above-mentioned alloy powder and average grain diameter3O4Powder is added to
In stainless steel, rear and alloy powder and Fe are well mixed3O4The sodium silicate solution of powder gross weight 5% is added to together to roll
Suppress agglomerating in device, be finally ground into average grain diameter for 80 μm.Wherein, the component of carburant includes：C：99%th, S：0.4th, water
Point：0.2%, granularity is 0.2~1mm.
Embodiment 5 (application)
Application of the spheroidal graphite cast-iron inovulant in cast iron：Required cast iron is obtained by three inoculations, will be relative to
The inovulant of molten steel quality fraction 0.2% is uniformly divided into three parts, and wraps into respectively in aluminium foil, is preheated to 300 DEG C；
First part of inovulant is first added in container, molten iron is then injected into；When the molten iron for entering container highly reaches container
1/2nd when, add second part of inovulant；Continue pouring molten iron, the 3rd part of inovulant is added with molten iron, the is carried out to it
Three inoculations.Molten iron is added into container first the time control of molten iron is filled with into container within 10min, molten iron
Temperature is 1400 DEG C.
Molten iron stirs after third time inoculation, breeds 1 hour, and temperature is maintained at 1000 DEG C.Breed knot
Shu Hou, is rapidly cooled to 500 DEG C under liquid nitrogen environment, takes out casting, is air-cooled to room temperature.
Embodiment 6 (application)
Application of the spheroidal graphite cast-iron inovulant in cast iron：Required cast iron is obtained by three inoculations, will be relative to
The inovulant of molten steel quality fraction 0.6% is uniformly divided into three parts, and wraps into respectively in aluminium foil, is preheated to 400 DEG C；
First part of inovulant is first added in container, molten iron is then injected into；When the molten iron for entering container highly reaches container
1/2nd when, add second part of inovulant；Continue pouring molten iron, the 3rd part of inovulant is added with molten iron, the is carried out to it
Three inoculations.Molten iron is added into container first the time control of molten iron is filled with into container within 10min, molten iron
Temperature is 1600 DEG C.
Molten iron stirs after third time inoculation, breeds 2 hours, and temperature is maintained at 1200 DEG C.Breed knot
Shu Hou, is rapidly cooled to 600 DEG C under liquid nitrogen environment, takes out casting, is air-cooled to room temperature.
Embodiment 7 (application)
Application of the spheroidal graphite cast-iron inovulant in cast iron：Required cast iron is obtained by three inoculations, will be relative to
The inovulant of molten steel quality fraction 0.4% is uniformly divided into three parts, and wraps into respectively in aluminium foil, is preheated to 350 DEG C；
First part of inovulant is first added in container, molten iron is then injected into；When the molten iron for entering container highly reaches container
1/2nd when, add second part of inovulant；Continue pouring molten iron, the 3rd part of inovulant is added with molten iron, the is carried out to it
Three inoculations.Molten iron is added into container first the time control of molten iron is filled with into container within 10min, molten iron
Temperature is 1500 DEG C.
Molten iron stirs after third time inoculation, breeds 1.5 hours, and temperature is maintained at 1100 DEG C.Breed
After end, 550 DEG C are rapidly cooled under liquid nitrogen environment, casting is taken out, is air-cooled to room temperature.
One of ordinary skill in the art will be appreciated that embodiment described here is to aid in reader and understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such especially statement and embodiment.This area
Those of ordinary skill can make according to these technical inspirations disclosed by the invention various does not depart from the other each of essence of the invention
Plant specific deformation and combine, these deformations and combination are still within the scope of the present invention.
Claims (6)
1. a kind of preparation method of spheroidal graphite cast-iron inovulant, it is characterised in that comprise the following steps：
(1) by mass percentage 66~72% Si, 3~10% Ba, 1~2% Ca, 0.8~1.8% Al, 1.5~
2% Ce, 0.4~0.6% S, 0.5~1% carburant and surplus are Fe and inevitably trace element mixes equal
It is put into after even in vacuum electric furnace, replaces furnace air with argon gas, be warming up to 1300 DEG C to 1500 DEG C, 5~10min of melting, melting
During do not stop stirring, make raw material be well mixed；Pour into a mould in a reservoir, and container is placed in liquid nitrogen, make alloy raw material fast
Speed is cooled to room temperature, forms block, and block is ground into the alloy powder that average grain diameter is 10~30 μm；
(2) it is 0.5~1.5% in 10~30 μm of percentage by weight by obtained above-mentioned alloy powder and average grain diameter
Fe3O4Powder is added in stainless steel, is well mixed rear and alloy powder and Fe3O4The magnesium silicate of powder gross weight 3~5%
Solution is added in rolling device together suppresses agglomerating, is ground into average grain diameter for 50~100 μm；
The carburant is casting carburant, and its component includes by mass percentage：C：99%th, S：0.4%th, moisture：
0.2%, granularity is 0.2~1mm.
2. application of a kind of spheroidal graphite cast-iron inovulant in spheroidal graphite cast-iron as claimed in claim 1, it is characterised in that pass through
Three times inoculation obtains required spheroidal graphite cast-iron；
Three parts will be uniformly divided into relative to the inovulant of molten steel quality fraction 0.2~0.6%, and wrapped into respectively in aluminium foil, preheated
To 300~400 DEG C；
First time inoculation：First part of inovulant is added in container；
Second of inoculation：When the molten iron for entering container highly reaches 1/2nd, second part of inovulant is added；
Third time inoculation：Continue pouring molten iron, add the 3rd part of inovulant with molten iron, third time womb is carried out to it
Reason.
3. application of a kind of spheroidal graphite cast-iron inovulant in spheroidal graphite cast-iron as claimed in claim 2, it is characterised in that：First
Molten iron is added into container the time control of molten iron is filled with into container within 10min.
4. a kind of application of spheroidal graphite cast-iron inovulant in spheroidal graphite cast-iron according to Claims 2 or 3, its feature exists
In the temperature of the molten iron is 1400~1600 DEG C.
5. a kind of application of the spheroidal graphite cast-iron inovulant according to claim 2 in spheroidal graphite cast-iron, it is characterised in that iron
Water stirs after third time inoculation, breeds 1~2 hour, and temperature is maintained at 1000~1200 DEG C.
6. application of a kind of spheroidal graphite cast-iron inovulant according to claim 4 in spheroidal graphite cast-iron, it is characterised in that pregnant
Educate after end, 500~600 DEG C are rapidly cooled under liquid nitrogen environment, take out casting, be air-cooled to room temperature.
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| CN105624544A (en) * | 2016-02-26 | 2016-06-01 | 铜陵安东铸钢有限责任公司 | Compound rare earth nucleating agent for nodular cast iron and preparation method of compound rare earth nucleating agent |
| CN107321931A (en) * | 2017-06-27 | 2017-11-07 | 苏州楚博生物技术有限公司 | A kind of spheroidal graphite cast-iron pipe die powder |
| CN107475602A (en) * | 2017-07-20 | 2017-12-15 | 马鞍山市万鑫铸造有限公司 | Ferrite nodular cast iron alloy composite and its Low temperature processing techniques |
| CN113278756A (en) * | 2021-04-19 | 2021-08-20 | 成都宏源铸造材料有限公司 | Preparation method of silicon inoculant for cast iron |
| CN115820970B (en) * | 2022-11-14 | 2024-03-12 | 江苏吉鑫风能科技股份有限公司 | Production process of spheroidal graphite cast iron for wind power castings |
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| CN103255334A (en) * | 2013-03-15 | 2013-08-21 | 成都宏源铸造材料有限公司 | Camshaft specialized inoculant |
| CN104962802A (en) * | 2014-08-14 | 2015-10-07 | 成都宏源铸造材料有限公司 | Inoculation agent for camshaft and preparation method and application thereof |
| CN104195416B (en) * | 2014-08-18 | 2016-05-25 | 成都宏源铸造材料有限公司 | A kind of spheroidal graphite cast-iron inovulant and its preparation method and application |
| CN104195417A (en) * | 2014-08-18 | 2014-12-10 | 成都宏源铸造材料有限公司 | Preparation method of pipe powder for nodular cast iron and application of pipe powder |
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