CN109811247A - A kind of cast iron bismuth-containing inovulant and preparation method thereof - Google Patents
A kind of cast iron bismuth-containing inovulant and preparation method thereof Download PDFInfo
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- CN109811247A CN109811247A CN201910212043.9A CN201910212043A CN109811247A CN 109811247 A CN109811247 A CN 109811247A CN 201910212043 A CN201910212043 A CN 201910212043A CN 109811247 A CN109811247 A CN 109811247A
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Abstract
The invention discloses a kind of cast iron bismuth-containing inovulants and preparation method thereof, the silicon 60-70% including weight percentage, bismuth 1-5%, calcium 1-3%, aluminium 1-5%, norium element 2-7%, iron 20-30%.The present invention provides cast iron and can be applied to various gray iron casting production technologies with bismuth-containing inovulant, by the way that bismuth element is added, reduce and decompose iron phosphide eutectic, and the inverted chill of casting is inhibited to act on, the sensitivity profile for breeding rear casting reduces, and change graphite form, Oxygen potential is improved, ferrite content in casting matrix is dramatically increased；By the way that thulium is added, evolution molten iron is played, degree of supercooling is increased, pearlite is promoted to form and refine the effect of crystal grain；Content by controlling aluminium and calcium effectively improves the mechanical performance and workability of casting so that the aluminium calcium oxide in molten iron in reasonable content range, prevents it to breed interference to other elements.
Description
Technical field
The present invention relates to a kind of cast iron bismuth-containing inovulants and preparation method thereof, belong to casting technology field.
Background technique
Cast iron be it is carbon containing be greater than 2.1% iron-carbon alloy, it be by foundry iron (part conversion pig) in furnace again
Fusing, and add ferroalloy, steel scrap, foundry return adjusting component and obtain.Be cast iron be secondary operation with pig iron difference, mostly plus
Work is at ironcasting.There is ironcasting excellent castability can be made into complex parts, generally there is good machinability.In addition have
There are wearability and absorb shock resistance good, the features such as price is low.
Currently, improving the performance of gray cast iron, following several measures are often taken:
(1) reasonable selection of chemical component
The phosphorus content of gray cast iron is mostly 2.6%~3.6%, and for silicon content 1.2%~3.0%, carbon silicon is all consumingly
Promote graphited element, their influences to gray cast iron metallographic structure and mechanical property can be illustrated with carbon equivalent ce.It improves
Carbon equivalent promotes to be graphitized thicker, and quantity increases, intensity and hardness decline.Graphite can be reduced by reducing carbon equivalent, refine stone
Ink increases and just analyses austenite dendrites, to be the measure for improving Mechanical Properties of Grey Cast Iron and taking often.But reducing carbon equivalent can lead
The problems such as cause casting character reduces, and casting section sensibility increases, and casting internal stress increases, and hardness rises processing difficulties, therefore
Other measures must be aided with.
(2) change charge composition
The furnace charge of gray cast iron is generally made of the new pig iron, steel scrap, foundry returns and ferroalloy etc..Steel scrap is added, reduces iron liquid
The mechanical property of gray cast iron can be improved in phosphorus content, will be added in the different trade mark gray cast iron of life the steel scrap of different proportion as
Guarantee a Con trolling index of material capability.In recent years due to industrially developed country's steel scrap supply it is very abundant, price also far beyond
The new pig iron is cheap, has then developed and has not had to the new pig iron only with steel scrap and foundry returns, has been cast with the synthesis that carburetion method adjusts carbon amounts
Iron and its smelting process.Synthetic cast iron can not only reduce cost, and better mechanics can be obtained under same chemical component
Performance.
(3), iron liquid Overheating Treatment
Temperature, chemical component, degree of purity are three main metallurgical indexs of iron liquid, and the direct shadow of the height of bonded hard ferrite magnet
It rings and arrives ingredient and degree of purity.The raising of bonded hard ferrite magnet is conducive to improve mobility, obtains and perfect casting, reduces rejection rate, and
Be conducive to the improvement of mechanical property in a certain range.
(4), iron liquid inoculation
Inoculation is exactly inovulant to be attached to the metallurgy for changing iron liquid in iron liquid before iron liquid enters casting type chamber
State, so as to improve the microscopic structure and performance of cast iron, and the improvement of these performances can not be due to iron liquid after addition inovulant
The variation of chemical component is explained.With the improvement of inovulant, inoculation method, inoculation is improved in modern Foundry Production
The important means of cast iron.
Existing inoculation has the following disadvantages: the inovulant uneven components of 1, mechanical mixture, there are component segregation,
The cast properties produced are inconsistent；2, the practical effect of inovulant is mixed often not as good as a kind of inovulant is used alone
Effect is obvious, cannot play the due effect of element in inovulant well；3, higher calcium content and aluminium content are to molten iron
Pregnant effect it is poor, and calcium and aluminium have strong reduction, in molten iron sulphur and oxygen element react and to form oxidizing slag,
Influence molten steel quality.
Summary of the invention
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide one kind to prevent effective element
Segregation effectively plays the cast iron inovulant of bismuth element and thulium inoculation(effect).
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is as follows:
A kind of cast iron bismuth-containing inovulant, including following components in percentage by weight:
Silicon 60-70%；
Bismuth 1-5%；
Calcium 1-3%；
Aluminium 1-5%；
Norium element 2-7%；
Iron 20-30%.
Wherein, the addition of bismuth can reduce the eutectic cementite in casting, reduces and decomposes iron phosphide eutectic, and inhibits casting
Inverted chill effect, the sensitivity profile for breeding rear casting reduce.Simultaneously, thus it is possible to vary graphite form improves Oxygen potential, significant to increase
Add ferrite content in casting matrix, so as to cancel the heat-treatment of annealing technique to casting, can make to cast under casting too
Part reaches required mechanical performance.
Thulium can satisfy the molten steel preparation condition of low-carbon, low silicon, and play evolution molten iron, increase supercooling
Degree promotes pearlite to form and refine the effect of crystal grain.
By controlling the content of aluminium and calcium, so that the aluminium calcium oxide in molten iron prevents it in reasonable content range
Interference is bred to other elements.
Specifically, the norium element includes appointing in lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium and dysprosium
It anticipates two or more combinations.
Silicon, iron and the calcium constituent comes from 75B ferrosilicon, wherein silicone content 72-78%, aluminium content 1-3%, iron
Content is 30-35%, calcium content≤1%.
The bismuth element comes from bismuth metal.
The aluminium element comes from metallic aluminium.
The norium element comes from norium composition.
The present invention also provides the above-mentioned cast iron preparation methods of bismuth-containing inovulant, include the following steps:
(1) 75B ferrosilicon, bismuth metal, metallic aluminium and rare earth metal are proportionally weighed, and is broken into fritter；
(2) broken raw material is put into medium-frequency induction furnace and carries out melting, smelting temperature is 1250-1360 DEG C, and the time is
20~30min needs constantly to stir in fusion process, so that raw material adequately mixes；
(3) after melting, slurry is poured into the water cooling model filled with inert protective gas；
(4) it is crushed and pelletizes after ingot casting is cooling to obtain the final product.
The utility model has the advantages that
The present invention provides cast iron and can be applied to various gray iron casting production technologies with bismuth-containing inovulant, by the way that bismuth member is added
Element reduces and decomposes iron phosphide eutectic, and the inverted chill of casting is inhibited to act on, and the sensitivity profile for breeding rear casting reduces, and changes
Graphite form improves Oxygen potential, dramatically increases ferrite content in casting matrix；By the way that thulium is added, rise
To evolution molten iron, increase degree of supercooling, pearlite is promoted to form and refine the effect of crystal grain；By controlling the content of aluminium and calcium, make
The aluminium calcium oxide in molten iron is obtained in reasonable content range, prevents it to breed interference to other elements, effectively improves casting
The mechanical performance and workability of part.
Specific embodiment
According to following embodiments, the present invention may be better understood.
Embodiment 1
The cast iron bismuth-containing inovulant includes following components in percentage by weight:
Silicon 64%；
Bismuth 4%；
Calcium 1%；
Aluminium 2%；
Lanthanum 3%；
Cerium 2%；
Iron 24%.
By by 75B ferrosilicon (silicon 72-78%, aluminium 1-3%, iron 30-35%, calcium content≤1%), bismuth metal, metallic aluminium,
Lanthanoid metal, metallic cerium proportionally weigh each raw material, and are broken into fritter；It is then placed in medium-frequency induction furnace and carries out melting, melt
Refining temperature is 1250-1360 DEG C, time 25min, needs constantly to stir in fusion process, so that raw material adequately mixes；
After melting, slurry is poured into the water cooling model filled with inert protective gas；It is crushed and pelletizes after ingot casting is cooling to obtain the final product.
Embodiment 2
The cast iron bismuth-containing inovulant includes following components in percentage by weight:
Silicon 60%；
Bismuth 5%；
Calcium 1%；
Aluminium 1%；
Lanthanum 2%；
Cerium 1%；
Iron 30%.
By by 75B ferrosilicon (silicon 72-78%, aluminium 1-3%, iron 30-35%, calcium content≤1%), bismuth metal, metallic aluminium,
Lanthanoid metal, metallic cerium proportionally weigh each raw material, and are broken into fritter；It is then placed in medium-frequency induction furnace and carries out melting, melt
Refining temperature is 1250-1360 DEG C, and the time is 20~30min, needs constantly to stir in fusion process, so that raw material adequately mixes
It closes；After melting, slurry is poured into the water cooling model filled with inert protective gas；Being crushed granulation after ingot casting is cooling is
?.
Embodiment 3
The cast iron bismuth-containing inovulant includes following components in percentage by weight:
Silicon 70%；
Bismuth 4%；
Calcium 1%；
Aluminium 2%；
Lanthanum 2%；
Cerium 1%；
Iron 20%.
By by 75B ferrosilicon (silicon 72-78%, aluminium 1-3%, iron 30-35%, calcium content≤1%), bismuth metal, metallic aluminium,
Lanthanoid metal, metallic cerium proportionally weigh each raw material, and are broken into fritter；It is then placed in medium-frequency induction furnace and carries out melting, melt
Refining temperature is 1250-1360 DEG C, and the time is 20~30min, needs constantly to stir in fusion process, so that raw material adequately mixes
It closes；After melting, slurry is poured into the water cooling model filled with inert protective gas；Being crushed granulation after ingot casting is cooling is
?.
Embodiment 4
Examples 1 to 3 product is used in Cast Iron Production, the cast iron produced and common process (inovulant is not added) produce
Cast iron compare, can effectively eliminate that casting is microcosmic loose, eliminate D, E type graphite in casting, graphite is complete in metallographic testing result
Portion is in A type flake graphite, effectively improves content of pearlite in alloy, enhances the tensile strength and hardness of matrix, design parameter is shown in Table 1.
Table 1
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Common process |
| Content of pearlite in alloy % | 96.8 | 95.7 | 95.1 | 73.4 |
| Tensile strength MPa | 312 | 308 | 305 | 241 |
| Hardness HB | 234 | 228 | 224 | 164 |
The present invention provides the thinkings and method of a kind of cast iron bismuth-containing inovulant and preparation method thereof, implement the skill
There are many method and approach of art scheme, the above is only a preferred embodiment of the present invention, it is noted that this technology is led
For the those of ordinary skill in domain, various improvements and modifications may be made without departing from the principle of the present invention, these
Improvements and modifications also should be regarded as protection scope of the present invention.The available prior art of each component part being not known in the present embodiment
It is realized.
Claims (7)
1. a kind of cast iron bismuth-containing inovulant, which is characterized in that including following components in percentage by weight:
Silicon 60-70%；
Bismuth 1-5%；
Calcium 1-3%；
Aluminium 1-5%；
Norium element 2-7%；
Iron 20-30%.
2. cast iron according to claim 1 bismuth-containing inovulant, which is characterized in that the norium element packet
Include any two or more combination in lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium and dysprosium.
3. cast iron according to claim 1 or 2 bismuth-containing inovulant, which is characterized in that silicon, iron and the calcium constituent comes
From 75B ferrosilicon, wherein silicone content 72-78%, aluminium content 1-3%, iron content 30-35%, calcium content≤1%.
4. cast iron according to claim 1 or 2 bismuth-containing inovulant, which is characterized in that the bismuth element comes from metal
Bismuth.
5. cast iron according to claim 1 or 2 bismuth-containing inovulant, which is characterized in that the aluminium element comes from metal
Aluminium.
6. cast iron according to claim 1 or 2 bismuth-containing inovulant, which is characterized in that the norium member
Usually from norium composition.
7. the cast iron described in claim 1 preparation method of bismuth-containing inovulant, which comprises the steps of:
(1) 75B ferrosilicon, bismuth metal, metallic aluminium and rare earth metal are proportionally weighed, and is broken into fritter；
(2) broken raw material being put into medium-frequency induction furnace and carries out melting, smelting temperature is 1250-1360 DEG C, the time is 20~
30min needs constantly to stir in fusion process, so that raw material adequately mixes；
(3) after melting, slurry is poured into the water cooling model filled with inert protective gas；
(4) it is crushed and pelletizes after ingot casting is cooling to obtain the final product.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111676383A (en) * | 2020-06-09 | 2020-09-18 | 江苏亚峰合金材料有限公司 | Vermiculizer for heat-resistant cast iron and preparation method thereof |
| CN112475240A (en) * | 2020-11-26 | 2021-03-12 | 溧阳市万盛铸造有限公司 | Brake head casting method for avoiding edge thin-wall white notch |
| CN112921230A (en) * | 2021-01-15 | 2021-06-08 | 西安合力汽车配件有限公司 | Improved method of screw carburized part |
| CN113278758A (en) * | 2021-04-19 | 2021-08-20 | 成都宏源铸造材料有限公司 | Inoculant for thin-wall ferrite nodular cast iron and preparation method thereof |
| CN113930572A (en) * | 2021-10-19 | 2022-01-14 | 三祥新材股份有限公司 | Method for reducing element burning loss in inoculant smelting process |
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| CN1718819A (en) * | 2005-08-04 | 2006-01-11 | 郭成会 | Rare earth silicon cerium bismuth alloy and its production technology |
| CN107043841A (en) * | 2017-03-15 | 2017-08-15 | 南通宏德机电有限公司 | A kind of spheroidization and inoculation handling process of spheroidal graphite cast-iron |
| CN108085580A (en) * | 2017-12-31 | 2018-05-29 | 山东汇金股份有限公司 | A kind of high intensity, high tenacity cast condition ductile iron and its production method |
| CN109477154A (en) * | 2016-06-30 | 2019-03-15 | 埃尔凯姆公司 | The method of iron casting inoculant and production iron casting inoculant |
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Patent Citations (4)
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| CN1718819A (en) * | 2005-08-04 | 2006-01-11 | 郭成会 | Rare earth silicon cerium bismuth alloy and its production technology |
| CN109477154A (en) * | 2016-06-30 | 2019-03-15 | 埃尔凯姆公司 | The method of iron casting inoculant and production iron casting inoculant |
| CN107043841A (en) * | 2017-03-15 | 2017-08-15 | 南通宏德机电有限公司 | A kind of spheroidization and inoculation handling process of spheroidal graphite cast-iron |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111676383A (en) * | 2020-06-09 | 2020-09-18 | 江苏亚峰合金材料有限公司 | Vermiculizer for heat-resistant cast iron and preparation method thereof |
| CN112475240A (en) * | 2020-11-26 | 2021-03-12 | 溧阳市万盛铸造有限公司 | Brake head casting method for avoiding edge thin-wall white notch |
| CN112921230A (en) * | 2021-01-15 | 2021-06-08 | 西安合力汽车配件有限公司 | Improved method of screw carburized part |
| CN113278758A (en) * | 2021-04-19 | 2021-08-20 | 成都宏源铸造材料有限公司 | Inoculant for thin-wall ferrite nodular cast iron and preparation method thereof |
| CN113930572A (en) * | 2021-10-19 | 2022-01-14 | 三祥新材股份有限公司 | Method for reducing element burning loss in inoculant smelting process |
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