CN109338025A - A kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection - Google Patents
A kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection Download PDFInfo
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- CN109338025A CN109338025A CN201811245010.6A CN201811245010A CN109338025A CN 109338025 A CN109338025 A CN 109338025A CN 201811245010 A CN201811245010 A CN 201811245010A CN 109338025 A CN109338025 A CN 109338025A
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/10—Making spheroidal graphite cast-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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/04—Cast-iron alloys containing spheroidal graphite
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection, comprising the following steps: electric induction furnace melting-alloying element scaling loss-production spheroidal graphite cast-iron-produces synthetic cast iron with steel scrap+carburant；Step 1, make fuel with coke, by the iron block of solid and other furnace charges, by preheating, fusing, overheat, reduction, cupola well before last iron liquid is flowed into through EAF bottom, about 10min or so, iron liquid will often stay for some time in preceding cupola well, in this section of residence time, the increasing core of molten metal is advantageous, although the tapping temperature of electric furnace is generally at 1450 DEG C or so, magnesium iron is produced with the method for steel scrap plus carburant, the comprehensive physical performance quality of casting not only can be improved, production cost is also reduced simultaneously, and it can be very good to reduce air pollution, water pollution and dust pollution, keep producing spheroidal graphite cast iron from waste steel well lid more environmentally-friendly, greatly reduce environmental pollution.
Description
Technical field
The present invention relates to ductile cast iron manhole cover technical fields, more particularly, to a kind of producing spheroidal graphite cast iron from waste steel of environmental protection
Well lid inline process.
Background technique
Ductile cast iron manhole cover is one kind of spheroidal graphite cast-iron product, and spheroidal graphite cast-iron is obtained spherical by nodularization and inoculation
Graphite effectively improves the mechanical performance of cast iron, in particular improves plasticity and toughness, to obtain also higher than carbon steel
Intensity.Spheroidal graphite cast-iron is a kind of 20th century high strength cast iron material for growing up of the fifties, comprehensive performance close to
Steel is based on its excellent performance, and it is complicated to be successfully used to cast some stress, intensity, toughness, wearability require compared with
High part.Spheroidal graphite cast-iron rapidly developed for be only second to gray cast iron, using very extensive cast iron materials.It is so-called " with iron
Dai Gang " refers mainly to spheroidal graphite cast-iron.Ductile cast iron manhole cover mainly by spheroidal graphite cast-iron create Lai well lid, this well lid quality
The problem of quality has just involved Oxygen potential.The common coating for handling casting is exactly antirust asphalt caulk, certain spheroidal graphite cast-iron well
The surface of lid is also to handle by spraying antirust asphalt caulk.Ductile cast iron manhole cover has an advantage in that, precisely due to spheroidal graphite is cast
Iron intensity height, good toughness, so that spheroidal graphite casting well lid is lighter by 30% or so than the grey cast-iron well lid of same type.
Ductile cast iron manhole cover be generally divided into it is round and rectangular, it is general using round in terms of the road administration in urban district, because of circle
The well lid of shape is not easy to tilt, and can preferably protect the safety of pedestrian and vehicle.Using circle, mainly in view of circle
Well lid be the same by every diameter length in its center of circle, in this way if when the vehicle that well lid is passed through has rolled because
Anyway roll, diameter all can be slightly wider than following well head, and well lid will not be dropped in well head and be gone.And if using rectangular,
Because it is long that rectangular diagonal line is considerably longer than its each edge, when such well lid has been rolled, it is easy to along the diagonal line side of well head
To falling into well, security risk is caused.If well head is made into circle or is significantly less than well lid, rectangular well lid would not be fallen into
In well.The use of well lid depends on the size of well head, if the square well that area is far longer than well head have to be installed above
Lid had both saved the material of well lid then the utilization of material and practical value be not naturally directly more effective using circular well lid
Material, also ensures the safety of well head.
Current ductile cast iron manhole cover is often produced using normal spheroidal graphite cast-iron, and spheroidal graphite casting is greatly wasted
In addition iron resource is constantly risen by coke price, environmental protection and user require casting quality the shadow of more and more high factor
It rings, and due to the continuous rising of pig iron price, steel scrap socially precipitates that amount retained is more and price is lower, therefore greatly
Production cost is increased, and wastes scrap resources, and production technology is also less environmentally friendly, common production spheroidal graphite casting
Iron mode will cause great air pollution, water pollution and dust pollution, significantly increase the pollution to environment.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the existing defects, provides a kind of steel scrap production spheroidal graphite casting of environmental protection
Iron manhole cover inline process is often used normally with solving current ductile cast iron manhole cover mentioned above in the background art
Spheroidal graphite cast-iron is produced, and spheroidal graphite cast-iron resource is greatly wasted, and is in addition constantly risen by coke price, environmentally friendly and use
Family requires casting quality the influence of more and more high factor, and due to the continuous rising of pig iron price, steel scrap socially sinks
Shallow lake amount retained is more and price is lower, therefore significantly increases production cost, and waste scrap resources, and raw
Production. art is also less environmentally friendly, and it is dirty that common production spheroidal graphite cast-iron mode will cause great air pollution, water pollution and dust
The problem of contaminating, significantly increasing the pollution to environment.
To achieve the above object, the invention provides the following technical scheme: a kind of producing spheroidal graphite cast iron from waste steel well lid of environmental protection
Inline process, comprising the following steps:
Electric induction furnace melting-alloying element scaling loss-production spheroidal graphite cast-iron-produces synthetic cast iron with steel scrap+carburant；
Step 1: make fuel with coke, by the iron block of solid and other furnace charges, by preheating, fusing, overheat, reduction,
Cupola well before last iron liquid is flowed into through EAF bottom, about 10min or so, iron liquid will often stay for some time in preceding cupola well,
In this section of residence time, the increasing core of molten metal is advantageous, although the tapping temperature of electric furnace generally at 1450 DEG C or so,
But iron liquid, by the moment of overheated zone, about 1700 DEG C of furnace temperature, be with thin although iron liquid is very short by the time of overheated zone
What droplet passed through, hyperthermia and superheating can be obtained, facilitates graphite and is dissolved in iron liquid, eliminates the heredity of coarse graphite flake in the new pig iron
Property；
Step 2: the essential element carbon in cast iron, has a scaling loss to subtract increasing process with what is absorbed in fusion process, by
In iron liquid drop on scorching hot coke, iron liquid just absorbs the carbon atom in coke, so in entire fusion process, carbon
It absorbs and is greater than scaling loss, final phosphorus content is to increase, and same iron liquid can also absorb part sulphur from coke；
Step 3: packet will be first scalded before pressure ball agent makees spheroidising, since the burn-off rate of electric furnace is fast, when
After one packet magnesium iron is poured, when reprocessing next packet, temperature is also very high in packet, and molten iron, which pours into casting ladle, to cool down less, so again
When carrying out spheroidising, tapping temperature relatively can be more slightly lower compared with electric furnace, to spheroidising quality, influences less or does not have
It influences；
Step 4: every furnace melts interval time about 50-60 minutes, and interval time may sometimes with furnace melting iron liquid
Can be longer, casting ladle radiates, and the time is long, and temperature is low in packet, and after spheroidising, molten iron temperature about declines 80C, winter temperature in packet
What degree declined may be more, so tapping temperature is higher than the temperature of electric furnace when handling magnesium iron with furnace melting iron liquid.
Preferably, the spheroidising quality is the fusing and absorption, pouring temperature of nodulizer.
Preferably, the electric induction furnace melting can rise for molten iron temperature to mention 1570 DEG C or more, and can be in high temperature shape
It is kept the temperature for a long time under state, at such a temperature, the field trash that raw material can be made to bring into, and the folder formed in fusion process
Slag and inclusion floating are to iron liquid surface, for steel scrap+carburant, especially particle steel+steel scrap+carburant+foundry returns, this
A little furnace charge either steel scrap, particle steel either particle iron, is mostly white structure, and white structure has stronger heredity,
It eliminates heredity and just needs raising fusion temperature appropriate, increase soaking time, purifying molten iron that can be relatively good subtracts
Few casting defect.
Preferably, the amount of the alloying element scaling loss is low, and the scaling loss of manganese, silicon is convenient for each member lower than electro-smelting in molten iron
The regulation of element, can stablize chemical composition content.
Preferably, when the production spheroidal graphite cast-iron, the excessively high quality that will directly influence magnesium iron of sulfur content, such as nodularization
Rank is low, material obdurability is poor, casting has the casting flaws such as slag inclusion, and with when electro-smelting cast iron, there is no have increasing reaction of Salmon-Saxl.
Preferably, described to produce synthetic cast iron with steel scrap+carburant, since the inclusion content of steel scrap is low, ingredient is steady
It is fixed, add carburant after high melt, eliminates the heredity of furnace charge, the degree of purity of iron liquid is improved, while carburant
With inoculation(effect), promote the more stable protrusion of graphited effect, the matrix crystal grain of casting can more uniform, refinement,
So producing the toughness of castings material and intensity is improved.
Compared with prior art, the present invention provides a kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection,
Have it is following the utility model has the advantages that
1, synthetic cast iron is produced with steel scrap+carburant there is no there is increasing reaction of Salmon-Saxl when electro-smelting cast iron of the invention,
Since the inclusion content of steel scrap is low, stable components add carburant after high melt, eliminate the heredity of furnace charge, iron
The degree of purity of liquid is improved, while carburant has inoculation(effect), promotes the more stable protrusion of graphited effect, casting
Matrix crystal grain can more uniform, refinement, so producing the toughness of castings material and intensity is improved.
2, present invention electric furnace Scrap Smelting or iron filings+carburant production spheroidal graphite cast-iron, stabilized product quality to be thought,
" short " for needing to mend, for mainly solution molten metal in solidification and crystallization, iron liquid degree of supercooling few from fat crystal nucleus be big, graphitizability
Difference, casting hardness are high and are not easy to the problem of being machined, and produce magnesium iron with the method for steel scrap plus carburant, can not only mention
The comprehensive physical performance quality of high casting, while production cost is also reduced, and can be very good to reduce air pollution, water
Pollution and dust pollution, keep producing spheroidal graphite cast iron from waste steel well lid more environmentally-friendly, greatly reduce environmental pollution.
It is not directed to part in the device to be the same as those in the prior art or can be realized by using the prior art, knot of the present invention
Structure is scientific and reasonable, safe and convenient to use, provides a great help for people.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described reality
Applying example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field
Those of ordinary skill's every other embodiment obtained without making creative work, belongs to guarantor of the present invention
The range of shield.
In the description of the present invention, it should be noted that term " on ", "lower", "inner", "outside" " front end ", " rear end ",
The orientation or positional relationship of the instructions such as " both ends ", " one end ", " other end " is the orientation or positional relationship based on shown in, is only
For the convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning must have specifically
Orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ",
" second " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ",
" being provided with ", " connection " etc., shall be understood in a broad sense, such as " connection ", may be a fixed connection, may be a detachable connection,
Or integral type connection；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, intermediary can also be passed through
It is indirectly connected, can be the connection inside two elements.It for the ordinary skill in the art, can be with concrete condition
Understand the concrete meaning of above-mentioned term in the present invention.
The present invention provides a kind of technical solution: a kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection, including
Following steps:
Electric induction furnace melting-alloying element scaling loss-production spheroidal graphite cast-iron-produces synthetic cast iron with steel scrap+carburant；
Step 1: make fuel with coke, by the iron block of solid and other furnace charges, by preheating, fusing, overheat, reduction,
Cupola well before last iron liquid is flowed into through EAF bottom, about 10min or so, iron liquid will often stay for some time in preceding cupola well,
In this section of residence time, the increasing core of molten metal is advantageous, although the tapping temperature of electric furnace generally at 1450 DEG C or so,
But iron liquid, by the moment of overheated zone, about 1700 DEG C of furnace temperature, be with thin although iron liquid is very short by the time of overheated zone
What droplet passed through, hyperthermia and superheating can be obtained, facilitates graphite and is dissolved in iron liquid, eliminates the heredity of coarse graphite flake in the new pig iron
Property；
Step 2: the essential element carbon in cast iron, has a scaling loss to subtract increasing process with what is absorbed in fusion process, by
In iron liquid drop on scorching hot coke, iron liquid just absorbs the carbon atom in coke, so in entire fusion process, carbon
It absorbs and is greater than scaling loss, final phosphorus content is to increase, and same iron liquid can also absorb part sulphur from coke；
Step 3: packet will be first scalded before pressure ball agent makees spheroidising, since the burn-off rate of electric furnace is fast, when
After one packet magnesium iron is poured, when reprocessing next packet, temperature is also very high in packet, and molten iron, which pours into casting ladle, to cool down less, so again
When carrying out spheroidising, tapping temperature relatively can be more slightly lower compared with electric furnace, to spheroidising quality, influences less or does not have
It influences；
Step 4: every furnace melts interval time about 50-60 minutes, and interval time may sometimes with furnace melting iron liquid
Can be longer, casting ladle radiates, and the time is long, and temperature is low in packet, and after spheroidising, molten iron temperature about declines 80C, winter temperature in packet
What degree declined may be more, so tapping temperature is higher than the temperature of electric furnace when handling magnesium iron with furnace melting iron liquid.
In the present invention, it is preferred that spheroidising quality is the fusing and absorption, pouring temperature of nodulizer.
In the present invention, it is preferred that electric induction furnace melting is that molten iron temperature can rise to mention 1570 DEG C or more, and can be
It is kept the temperature for a long time under the condition of high temperature, at such a temperature, the field trash that raw material can be made to bring into, and in fusion process shape
At slag inclusion and inclusion floating to iron liquid surface, steel scrap+carburant, especially particle steel+steel scrap+carburant+are melted down
Material, these furnace charges either steel scrap, particle steel either particle iron, are mostly white structures, and white structure has stronger something lost
Transmissibility will eliminate heredity and just need raising fusion temperature appropriate, increase soaking time, purification iron that can be relatively good
Liquid reduces casting defect.
In the present invention, it is preferred that the amount of alloying element scaling loss is low, and the scaling loss of manganese, silicon is lower than electro-smelting in molten iron, just
In the regulation of each element, chemical composition content can be stablized.
In the present invention, it is preferred that when production spheroidal graphite cast-iron, the excessively high quality that will directly influence magnesium iron of sulfur content, such as
Nodulizing grade is low, material obdurability is poor, casting has the casting flaws such as slag inclusion, and with when electro-smelting cast iron, there is no have increasing sulphur
Reaction.
In the present invention, it is preferred that synthetic cast iron is produced with steel scrap+carburant, since the inclusion content of steel scrap is low, at
Divide and stablize, adds carburant after high melt, eliminate the heredity of furnace charge, the degree of purity of iron liquid is improved, increases simultaneously
Carbon agent has inoculation(effect), promotes the more stable protrusion of graphited effect, the matrix crystal grain of casting can it is more uniform,
Refinement, so producing the toughness of castings material and intensity is improved.
Embodiment one
Spheroidal graphite cast-iron is produced with electric furnace Scrap Smelting or iron filings+carburant, stabilized product quality to be thought needs to mend
" short ", mainly solution molten metal are few from fat crystal nucleus, iron liquid degree of supercooling is big, graphitizability is poor, casting in solidification and crystallization
Hardness is high and is not easy to the problem of being machined.Specifically " mend short " operating method is: one, smelting the later period it is noted that " spontaneous
The culture of nucleus ".Suitable steel scrap, which is added, makes iron liquid Quench, while suitable addition ferrosilicon and fine grain carburant, on
Face covering and heat insulating agent reduces power or has a power failure heat preservation a period of time, to promote that fine crystalline graphite is precipitated.Two, coming out of the stove or
In casting process, sufficient Multi inoculation processing is carried out, with supplement " external nucleus ", short grained carburant, broken can be added
Ferrosilicon powder and composite inoculant promote the effect of raw core fine although additional amount is seldom.If three, sulfur content
It is too low that a little sulphur iron can be added in right amount (when especially production HT), but must control in the range of requiring.Optimization operation journey in a word
Sequence refer to be exactly: furnace charge enter the sequencing of furnace, the control of the temperature in melting and tapping temperature, the selected control of chemical component, with
And intensive inoculation and compound inoculated.
Embodiment two
In actual production, carbon equivalent control is online in, and silicon strives control online, it is intended to improve the graphite of iron liquid
Change ability.First the new pig iron is added in furnace bottom in addition sequence, operating method and the temperature control of furnace charge, adds steel scrap, carburant
(being added by rule of thumb according to furnace charge situation, accumulate to form heat zone to prevent carburant) adds steel scrap and carburant in fusing, to the greatest extent
The 60-70% of additional amount may be needed to add carburant before particle steel is not added, last add-back furnace charge.In this section
In time, in order to improve the absorptivity of carburant, the heredity in iron liquid is eliminated, high power high-temperature is preferably used to melt.
Embodiment three
After in-furnace temperature raising carburant dissolution is absorbed by iron liquid, part ferrosilicon is added in peace and quiet heat preserving agent and slag,
The covering and heat insulating agent on ferrosilicon, the additional amount of ferrosilicon should substitute into silicon 1.2% or so, this is because steel scrap and particle steel
Silicon content is all very low, part ferrosilicon is added, first is that in order to play deoxidation；Second is that making into reduce later period adjusting range
Divide content more accurate；Third is that avoiding measurement from failing for the measurement range that iron liquid component content is no more than thermal analyzer.Also
It should be noted that will first add carburant, to carburetting no matter when any stage needing while adding carburant and ferrosilicon
Agent melts diffusion and is absorbed and then adds carburant.This is because silicon has row's carbon characteristic, i.e. the increase of silicon amount reduces carbon
Solubility in molten iron.Its purpose is still in order to improve the absorptivity of carburant.
There is no there is increasing reaction of Salmon-Saxl when present invention electro-smelting cast iron, synthetic cast iron is produced with steel scrap+carburant, by
Low in the inclusion content of steel scrap, stable components add carburant after high melt, eliminate the heredity of furnace charge, iron liquid
Degree of purity be improved, while carburant have inoculation(effect), promote the more stable protrusion of graphited effect, casting
Matrix crystal grain can more uniform, refinement, so producing the toughness of castings material and intensity is improved.
Present invention electric furnace Scrap Smelting or iron filings+carburant produce spheroidal graphite cast-iron, and stabilized product quality to be thought needs
" short " to be mended, for mainly solution molten metal in solidification and crystallization, iron liquid degree of supercooling few from fat crystal nucleus be big, graphitizability
Difference, casting hardness are high and are not easy to the problem of being machined, and produce magnesium iron with the method for steel scrap plus carburant, can not only mention
The comprehensive physical performance quality of high casting, while production cost is also reduced, and can be very good to reduce air pollution, water
Pollution and dust pollution, keep producing spheroidal graphite cast iron from waste steel well lid more environmentally-friendly, greatly reduce environmental pollution.
It is not directed to part in the device to be the same as those in the prior art or can be realized by using the prior art, knot of the present invention
Structure is scientific and reasonable, safe and convenient to use, provides a great help for people.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection, which comprises the following steps:
Electric induction furnace melting-alloying element scaling loss-production spheroidal graphite cast-iron-produces synthetic cast iron with steel scrap+carburant；
Step 1: making fuel with coke, by the iron block of solid and other furnace charges, by preheating, fusing, overheat, reduction, last iron
Cupola well before liquid is flowed into through EAF bottom, about 10min or so, iron liquid will often stay for some time in preceding cupola well, in this section
In residence time, the increasing core of molten metal is advantageous, although the tapping temperature of electric furnace generally at 1450 DEG C or so, iron liquid
By the moment of overheated zone, about 1700 DEG C of furnace temperature, be to be passed through with fine drop although iron liquid is very short by the time of overheated zone
, hyperthermia and superheating can be obtained, facilitates graphite and is dissolved in iron liquid, eliminates the heredity of coarse graphite flake in the new pig iron；
Step 2: the essential element carbon in cast iron, has a scaling loss to subtract increasing process with what is absorbed, due to iron liquid in fusion process
Drop is on scorching hot coke, and iron liquid just absorbs the carbon atom in coke, so the absorption of carbon is greater than in entire fusion process
Scaling loss, final phosphorus content are to increase, and same iron liquid can also absorb part sulphur from coke；
Step 3: packet will be first scalded before pressure ball agent makees spheroidising, since the burn-off rate of electric furnace is fast, when the first packet
After magnesium iron is poured, when reprocessing next packet, temperature is also very high in packet, and molten iron, which pours into casting ladle, to cool down less, so carrying out again
When spheroidising, tapping temperature relatively can be more slightly lower compared with electric furnace, to spheroidising quality, influences little or does not influence；
Step 4: every furnace melts interval time about 50-60 minutes, and interval time may be more sometimes with furnace melting iron liquid
Long, casting ladle time of radiating is long, wrap in temperature it is low, after spheroidising, the interior molten iron temperature of packet about declines 80C, under winter temperature
That drops may be more, so tapping temperature is higher than the temperature of electric furnace when handling magnesium iron with furnace melting iron liquid.
2. a kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection according to claim 1, which is characterized in that
The spheroidising quality is the fusing and absorption, pouring temperature of nodulizer.
3. a kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection according to claim 1, which is characterized in that
The electric induction furnace melting is that molten iron temperature can rise to mention 1570 DEG C or more, and can protect for a long time at high operating temperatures
Temperature, at such a temperature, the field trash that raw material can be made to bring into, and fusion process formed slag inclusion and inclusion floating extremely
Iron liquid surface, for steel scrap+carburant, especially particle steel+steel scrap+carburant+foundry returns, these furnace charges either steel scrap,
Particle steel either particle iron, is mostly white structure, and white structure has stronger heredity, to eliminate heredity and just need
Raising fusion temperature appropriate, increases soaking time, and purifying molten iron that can be relatively good reduces casting defect.
4. a kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection according to claim 1, which is characterized in that
The amount of the alloying element scaling loss is low, and the scaling loss of manganese, silicon is lower than electro-smelting in molten iron, convenient for the regulation of each element, Neng Gouwen
Determine chemical composition content.
5. a kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection according to claim 1, which is characterized in that
When the production spheroidal graphite cast-iron, the excessively high quality that will directly influence magnesium iron of sulfur content, as nodulizing grade is low, material is tough
Property poor, casting have the casting flaws such as slag inclusion, with when electro-smelting cast iron there is no there is increasing reaction of Salmon-Saxl.
6. a kind of producing spheroidal graphite cast iron from waste steel well lid inline process of environmental protection according to claim 1, which is characterized in that
Described to produce synthetic cast iron with steel scrap+carburant, since the inclusion content of steel scrap is low, stable components add carburant through high temperature
After melting, the heredity of furnace charge is eliminated, the degree of purity of iron liquid is improved, while carburant has inoculation(effect), promotes
The graphited more stable protrusion of effect, the matrix crystal grain of casting can more uniform, refinement, so producing castings material
Toughness and intensity be improved.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110394424A (en) * | 2019-08-29 | 2019-11-01 | 安徽普瑞明精密机械有限公司 | A method of melting, which is carried out, using the pig iron improves spheroidal graphite cast-iron manhole cover intensity |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002266047A (en) * | 2001-03-07 | 2002-09-18 | Nippon Chutetsukan Kk | Ductile cast iron pipe and manufacturing method therefor |
| CN102732664A (en) * | 2012-07-17 | 2012-10-17 | 长沙金龙铸造实业有限公司 | Ductile cast iron production method and production device |
| CN107119168A (en) * | 2017-06-13 | 2017-09-01 | 磐石华兴汽车零部件制造有限公司 | A kind of method that blast-melted short route casts high-quality casting |
| CN107385311A (en) * | 2017-07-18 | 2017-11-24 | 宁波日星铸业有限公司 | The method for improving spheroidal graphite cast-iron melt iron degree of purity |
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| JP2002266047A (en) * | 2001-03-07 | 2002-09-18 | Nippon Chutetsukan Kk | Ductile cast iron pipe and manufacturing method therefor |
| CN102732664A (en) * | 2012-07-17 | 2012-10-17 | 长沙金龙铸造实业有限公司 | Ductile cast iron production method and production device |
| CN107119168A (en) * | 2017-06-13 | 2017-09-01 | 磐石华兴汽车零部件制造有限公司 | A kind of method that blast-melted short route casts high-quality casting |
| CN107385311A (en) * | 2017-07-18 | 2017-11-24 | 宁波日星铸业有限公司 | The method for improving spheroidal graphite cast-iron melt iron degree of purity |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110394424A (en) * | 2019-08-29 | 2019-11-01 | 安徽普瑞明精密机械有限公司 | A method of melting, which is carried out, using the pig iron improves spheroidal graphite cast-iron manhole cover intensity |
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