CN103805731B - A kind of inoculation method of spheroidal graphite cast-iron - Google Patents
A kind of inoculation method of spheroidal graphite cast-iron Download PDFInfo
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- CN103805731B CN103805731B CN201310662701.7A CN201310662701A CN103805731B CN 103805731 B CN103805731 B CN 103805731B CN 201310662701 A CN201310662701 A CN 201310662701A CN 103805731 B CN103805731 B CN 103805731B
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Abstract
The present invention discloses the inoculation method of a kind of spheroidal graphite cast-iron, relates to a kind of nodular cast iron alloy preparation method, belongs to Manufacturing Technology of Nodular Cast Iron field.The method breeds in including ladle, ladle-to-ladle breed, current-following inoculation.It has the beneficial effects that: the present invention breeds in original nodularization bag increases ladle-to-ladle inoculated technology between current-following inoculation the two step, realize instantaneous Multi inoculation special warfare, reach the long-acting of molten iron to breed, can effectively reduce residual content of magnesium in spheroidization molten iron, reduce the cementite quantity in as-cast structure, material mechanical performance reach tensile strength 453MPa, yield strength 287MPa, extend 21～25%, the number of graphite reach 150/mm2。
Description
Technical field
The present invention relates to a kind of nodular cast iron alloy preparation method, belong to Manufacturing Technology of Nodular Cast Iron field, tool
Say it is the inoculation method of a kind of spheroidal graphite cast-iron body.
Background technology
Spheroidal graphite cast-iron is to obtain globular graphite by nodularization and inoculation, and it is effectively improved the machine of cast iron
Tool performance, in particular improves plasticity and toughness, thus obtains the intensity higher than carbon steel.Spheroidal graphite cast-iron is
20th century a kind of high-strength cast iron material of growing up of the fifties, its combination property is close to steel, just
Performance based on its excellence, is successfully used to cast some stress complicated, and intensity, toughness, wearability are wanted
Seek higher part.Nodularization i.e. refers to that the graphite in cast iron becomes graphite crystallization under the influence of the nodulizer added
Process.In conventional spheroidal graphite cast-iron casting process, the most only add a kind of nodulizer so that it is carried out nodularization,
But a kind of nodulizer is constantly present many defects due to the restriction of quality and composition.
The effect of inoculation mainly eliminates the chilling tendency that nodularization element causes, and promotes Graphite Precipitation, carries
High Oxygen potential, refines graphite nodule, is allowed to be evenly distributed.Domestic enterprise uses inovulant and inoculation method at present
It is not quite similar, but all emphasizes Multi inoculation to be used, instant inoculation technique, with intensive inoculation effect, it is ensured that
Molten iron until being poured all to be in and good breeding state, eliminates cementite tissue in the long period effectively.
For as-cast ball iron, inovulant uses Antaciron mostly, except the bag end puts inovulant or taps a blast furnace with stream once
Outside breeding, also take floating silicon to breed, pour into a mould breed in current-following inoculation, cup silico briquette type, mould cavity inoculation etc.
Method.
In current domestic casting field, the acceptance criteria of nodular iron casting in addition to surface quality, is all by it
The requirement of the material trade mark, defines it with mechanical performance the most qualified as acceptance criteria.Mechanical performance detection is qualified
Then product is judged to qualified, and chemical analysis is only reference, and nodulizing grade be there are certain requirements by portioned product, and
Constituting its matrix has that the foundry goods matrix graphite ball quantity of decisive role is domestic there is no a technology so far
Standard is distinctly claimed.
Using the nodular iron casting that conventional processing technique produces, mechanical performance can reach product requirement after testing, but
The number of graphite is only capable of reaching the 50 of standard-required～about 70%, so that the preparation that can not meet special foundry goods is wanted
Ask, such as: heavy castings are too big due to size, and heat-treated heat size limits, can only be that as cast condition produces, and
And general more than the 100mm of wall thickness, for large-section magnesium iron, Large-cross-section nodular cast iron is slow due to rate of cooling, solidification
Time is long so that foundry goods especially foundry goods centre easily occur graphite morphology, ball number reduce, graphite nodule increase,
Grain coarsening, Oxygen potential reduction, composition segregation, intergranular carbide increase and graphite floatation, cause decaying spheroidisation
Phenomenon, causes mechanical castings to be substantially reduced.
Summary of the invention
The present invention proposes the inoculation method of a kind of spheroidal graphite cast-iron, solves Oxygen potential and increases unit are graphite nodule
Quantity, strengthens spheroidal graphite cast-iron matrix, improves foundry goods combination property patented technology comprehensively.
For achieving the above object, the inoculation method of a kind of spheroidal graphite cast-iron of the present invention, comprise the following steps:
(1) breed in ladle, breed for the first time in ladle when coming out of the stove and come out of the stove, with casting pouring when coming out of the stove
The 0.05 of gross weight～0.65% adds high efficiency composite inoculant, carries out breeding for the first time in ladle；
(2) ladle-to-ladle breed, after the molten iron of step (1) stands slagging-off, cool to pouring temperature be 1380～
1390 DEG C, use the 0.05～0.65% of casting pouring gross weight to add high efficiency composite inoculant during cast and carry out two
Secondary breed；
(3) current-following inoculation, through step (2) molten iron cast time use casting pouring gross weight 0.05～
0.65% adds the conventional instantaneous current-following inoculation of extraordinary inovulant.
Described high efficiency composite inoculant be BaCaSi model be J-3, it is mainly by the raw material of following weight proportion
Make: Si68.0～72.0%, Ca1.0～2.0%, Al0～1.6%, Ba1.0～3.0%.
Described extraordinary inovulant be SiZrSr model be P-1T, it is mainly prepared from the following raw materials in parts by weight:
Si63～67%, Zr5.0～7.0%, Sr0.5～1.0%, Ba2.0～3.0%, Ca1.0～2.0%.
The firing equipment bred in ladle in described step (1) is intermediate frequency furnace, and smelting temperature is 1550 DEG C.
Breed in described ladle and add high efficiency composition with the 0.45～0.65% of casting pouring gross weight when coming out of the stove
Inovulant.
It is described that ladle-to-ladle to use the 0.25～0.35% of casting pouring gross weight to add high efficiency composition when breeding cast pregnant
Educate agent.
The 0.05～0.15% of casting pouring gross weight is used to add extraordinary inovulant during the cast of described current-following inoculation.
Described high efficiency composite inoculant and extraordinary inovulant market can be buied, and raw material of the present invention is remote selected from Xi'an
Big founding materials Technology Co., Ltd. product, selection product is: high efficiency composite inoculant is that BaCaSi model is
J-3；Extraordinary inovulant be SiZrSr model be P-1T.
The inoculation method of a kind of spheroidal graphite cast-iron of the present invention, it has the beneficial effects that: the present invention is original
Breed in nodularization bag and increase ladle-to-ladle inoculated technology between current-following inoculation the two step, it is achieved be instantaneous the most pregnant
Educate special warfare, reach the long-acting of molten iron and breed, it is possible to effectively reduce residual content of magnesium in spheroidization molten iron, reduce
Cementite quantity in as-cast structure, material mechanical performance reaches tensile strength 453MPa, yield strength
287MPa, extend 21～25%, the number of graphite reach 150/mm2。
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, the technical scheme in the present invention is clearly and completely described,
Obviously, described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
The every other embodiment obtained, broadly falls into the scope of protection of the invention.
Embodiment 1
One, breed in ladle, breed intermediate frequency furnace melting 1550 DEG C for the first time in ladle when coming out of the stove and come out of the stove,
With the 0.45% addition model BaCaSi high efficiency composite inoculant as J-3 of casting pouring gross weight when coming out of the stove,
Carry out breeding for the first time in ladle；
Two, ladle-to-ladle breeding, after the molten iron of step (1) stands slagging-off, cooling to pouring temperature is 1385 DEG C,
The BaCaSi high efficiency composite inoculant that 0.25% addition model is J-3 of casting pouring gross weight is used during cast
Carry out late inoculation；
Three, current-following inoculation, the 0.05% addition model using casting pouring gross weight during cast is P-1T's
The conventional instantaneous current-following inoculation of SiZrSr special type inovulant.
Embodiment 2
One, breed in ladle, breed intermediate frequency furnace melting 1550 DEG C for the first time in ladle when coming out of the stove and come out of the stove,
With the 0.65% addition model BaCaSi high efficiency composite inoculant as J-3 of casting pouring gross weight when coming out of the stove,
Carry out breeding for the first time in ladle；
Two, ladle-to-ladle breeding, after the molten iron of step (1) stands slagging-off, cooling to pouring temperature is 1390 DEG C,
The BaCaSi high efficiency composite inoculant that 0.35% addition model is J-3 of casting pouring gross weight is used during cast
Carry out late inoculation；
Three, current-following inoculation, the 0.1% addition model using casting pouring gross weight during cast is P-1T's
The conventional instantaneous current-following inoculation of SiZrSr special type inovulant.
Embodiment 3
One, breed in ladle, breed intermediate frequency furnace melting 1550 DEG C for the first time in ladle when coming out of the stove and come out of the stove,
With the 0.55% addition model BaCaSi high efficiency composite inoculant as J-3 of casting pouring gross weight when coming out of the stove,
Carry out breeding for the first time in ladle；
Two, ladle-to-ladle breeding, after the molten iron of step (1) stands slagging-off, cooling to pouring temperature is 1380 DEG C,
The BaCaSi high efficiency composite inoculant that 0.3% addition model is J-3 using casting pouring gross weight during cast enters
Row late inoculation；
Three, current-following inoculation, the 0.15% addition model using casting pouring gross weight during cast is P-1T's
The conventional instantaneous current-following inoculation of SiZrSr special type inovulant.
Through Shanghai Inst. of Materials, detection is as follows:
As can be known from the above table: tensile strength, yield strength, extension, the number of graphite, country's foundry goods it is superior to
Standard, and the number of graphite exceedes working standard value more than 2 times, and nodulizing grade is all in 1-2 level.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Within bright spirit and principle, any modification, equivalent substitution and improvement etc. made, should be included in this
Within bright protection domain.
Claims (5)
1. the inoculation method of a spheroidal graphite cast-iron, it is characterised in that: comprise the following steps:
(1) breed in ladle, breed for the first time in ladle when coming out of the stove and come out of the stove, with casting pouring when coming out of the stove
The 0.05 of gross weight～0.65% adds composite inoculant, carries out breeding for the first time in ladle；
(2) ladle-to-ladle breed, after the molten iron of step (1) stands slagging-off, cool to pouring temperature be 1380～
1390 DEG C, using the 0.05～0.65% of casting pouring gross weight to add composite inoculant during cast, to carry out secondary pregnant
Educate；
(3) current-following inoculation, through step (2) molten iron cast time use casting pouring gross weight 0.05～
0.65% adds the conventional instantaneous current-following inoculation of extraordinary inovulant；
Described composite inoculant is BaCaSi, and it is mainly prepared from the following raw materials in parts by weight: Si 68.0～
72.0%, Ca 1.0～2.0%, Al 0～1.6%, Ba 1.0～3.0%；
Described extraordinary inovulant is SiZrSr, and it is mainly prepared from the following raw materials in parts by weight: Si 63～67%,
Zr 5.0～7.0%, Sr 0.5～1.0%, Ba 2.0～3.0%, Ca 1.0～2.0%.
The inoculation method of a kind of spheroidal graphite cast-iron the most as claimed in claim 1, it is characterised in that: described step (1)
The firing equipment bred in middle ladle is intermediate frequency furnace, and smelting temperature is 1550 DEG C.
The inoculation method of a kind of spheroidal graphite cast-iron the most as claimed in claim 1, it is characterised in that: described ladle
Inside breed and add composite inoculant with the 0.45～0.65% of casting pouring gross weight when coming out of the stove.
The inoculation method of a kind of spheroidal graphite cast-iron the most as claimed in claim 1, it is characterised in that: described ladle-to-ladle pregnant
The 0.25～0.35% of casting pouring gross weight is used to add composite inoculant when educating cast.
The inoculation method of a kind of spheroidal graphite cast-iron the most as claimed in claim 1, it is characterised in that: described pregnant with stream
The 0.05～0.15% of casting pouring gross weight is used to add extraordinary inovulant when educating cast.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105908060A (en) * | 2016-05-26 | 2016-08-31 | 合肥市田源精铸有限公司 | Iron casting inoculant |
| CN105886883B (en) * | 2016-05-31 | 2017-08-04 | 含山县兴达球墨铸铁厂 | Inovulant and preparation method thereof and the application in spheroidal graphite cast-iron |
| CN106702255A (en) * | 2016-12-13 | 2017-05-24 | 广西大学 | Medium manganese ductile iron swirler and preparation method thereof |
| CN108504921A (en) * | 2018-07-03 | 2018-09-07 | 宁波力古机械制造有限公司 | A kind of oil-free machine rotor seat and preparation method |
| CN110791607A (en) * | 2019-11-21 | 2020-02-14 | 安徽九华富康冶金材料有限公司 | Silicon-strontium inoculant and preparation method thereof |
| CN111020357B (en) * | 2019-11-22 | 2021-11-16 | 湖北省丹江口丹传汽车传动轴有限公司 | Production method for batch production of stable pearlite nodular cast iron QT500-7 |
| CN113523205B (en) * | 2021-07-06 | 2023-10-13 | 武汉武重铸锻有限公司 | Spheroidizing inoculation method |
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|---|---|---|---|---|
| CN87100402A (en) * | 1986-01-21 | 1987-08-12 | 埃尔凯姆金属公司 | The nucleating agent of graphitic cast iron |
| CN101649369A (en) * | 2009-08-28 | 2010-02-17 | 河南省四达仙龙实业有限公司 | Melting process for producing synthetic cast iron by utilizing SiC carburizing siliconizing |
| CN101921945A (en) * | 2010-08-31 | 2010-12-22 | 新兴铸管股份有限公司 | Liquid iron inoculation process for ductile iron pipes |
| CN102416446A (en) * | 2010-09-27 | 2012-04-18 | 贾维珍 | High-strength cast iron inoculation production process |
| CN103422009A (en) * | 2013-08-14 | 2013-12-04 | 辉县市汽车配件有限责任公司 | Nodular cast iron for rear axle housing of lorry and production method of nodular cast iron |
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2013
- 2013-12-09 CN CN201310662701.7A patent/CN103805731B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87100402A (en) * | 1986-01-21 | 1987-08-12 | 埃尔凯姆金属公司 | The nucleating agent of graphitic cast iron |
| CN101649369A (en) * | 2009-08-28 | 2010-02-17 | 河南省四达仙龙实业有限公司 | Melting process for producing synthetic cast iron by utilizing SiC carburizing siliconizing |
| CN101921945A (en) * | 2010-08-31 | 2010-12-22 | 新兴铸管股份有限公司 | Liquid iron inoculation process for ductile iron pipes |
| CN102416446A (en) * | 2010-09-27 | 2012-04-18 | 贾维珍 | High-strength cast iron inoculation production process |
| CN103422009A (en) * | 2013-08-14 | 2013-12-04 | 辉县市汽车配件有限责任公司 | Nodular cast iron for rear axle housing of lorry and production method of nodular cast iron |
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