CN110396640A - A kind of superduty ductile cast iron manhole cover production technology - Google Patents
A kind of superduty ductile cast iron manhole cover production technology Download PDFInfo
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- CN110396640A CN110396640A CN201910799509.XA CN201910799509A CN110396640A CN 110396640 A CN110396640 A CN 110396640A CN 201910799509 A CN201910799509 A CN 201910799509A CN 110396640 A CN110396640 A CN 110396640A
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- iron
- manhole cover
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- manganese
- ductile cast
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
-
- 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
- C21C1/105—Nodularising additive agents
-
- 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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (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 superduty ductile cast iron manhole cover production technologies, with the pig iron, foundry return, steel scrap, ferrosilicon and manganese iron are that furnace charge carries out melting casting, improve the processing intensity of ductile cast iron manhole cover, it can satisfy the production requirement of superduty well lid simultaneously, the molten iron of appropriate carbon content is added in the furnace charge of melting, suitable silicon and manganese, it can prevent shrinkage porosite and crackle, the appearance of free cementite can be prevented again, be conducive to furnace charge spheroidization of graphite, and silicon can refine graphite in spheroidal graphite cast-iron, improve the roundness of graphite nodule, advantageously form ferrite, prevent cementite, recycle SiC as inorganic agent, carbon equivalent can be properly increased, reduce cost, the metallurgy condition of iron liquid is improved simultaneously, strengthen reproducibility, mitigate the detrimental effect of corrosion furnace charge, increase the number of graphite ball of spheroidal graphite cast-iron unit area, graphite nodule is big Small to reach 6 grades or more, stable mechanical performance improves superduty ductile cast iron manhole cover and produces qualification rate.
Description
Technical field
The present invention relates to ductile cast iron manhole cover technical field, specially a kind of superduty ductile cast iron manhole cover production technology.
Background technique
Ductile cast iron manhole cover increasingly increases with the demand on international market at home, and the competition in market is also growing more intense,
This requires product in kind and using wanting diversification in function, it is desirable that light-weight, intensity is high, surface quality is good, long service life.
Well lid design on, epithelium and wall thickness are designed to be more and more thinner, this just to the appearance of cold shut defect provide it is biggish can
It can property.Practice have shown that cold shut is the first big defect of ball iron manhole cover production.The production of two ball iron manhole covers is due to its wall thickness
Thin, size range is larger, and the iron liquid residue of magnesium iron is more, so that iron liquid filling is especially difficult.It is integrally strong that cold shut reduces well lid
Degree, affects surface quality of continuous castings, and in well lid production, macroscopic cold shut well lid is almost waste product entirely.It is made by hand
All often occurs cold shut in type and machine molding, the factors such as the position of cold shut and shape and product itself and production technology are related.
According to statistics, cold shut is formed by nearly 70% that waste product accounts for well lid whole waste product.Cold shut Resolving probiems must be got well, and can greatly improve production
Quality and yield rate reduce cost, improve the market competitiveness.It is old noisy clearly " cold shut of ductile cast iron manhole cover and its prevention and treatment are arranged
Apply " in by filling these molten iron mold-filling capacity such as type power, resistance and molten iron temperature and self-characteristic to fill sections water
Research analyzes the reason of cold shut is formed in more detail, to have found the control method of cold shut defect, and these methods is answered
For producing reality, good result is achieved, the science and practicability of these methods are demonstrated.Although cold shut phenomenon is being cast
Industry is quotidian defect, still, is still had very much for the research of superduty ductile cast iron manhole cover this specific products existing
Sincere justice.
Now widely used well lid is cast iron, it has the advantages that resistance to compression, wear-resisting, bearing capacity is high, but it intolerant to
Corrosion, be especially unsuitable for the more serious well lid of corrosion phenomenon, and because of its recovery value with higher, so be easy to by
It steals.Patent No. 95228436, the patent that notification number is 2238265 disclose a kind of compound manhole cover on road, it has corrosion resistant
Erosion, the advantages of low cost, but it has that structure is complicated, makes trouble, not wear-resisting disadvantage, state is not achieved in especially its bearing capacity
360KN as defined in family's standard cannot function as the use of superduty well lid.
Summary of the invention
The purpose of the present invention is to provide a kind of superduty ductile cast iron manhole cover production technologies, to solve above-mentioned background technique
The problem of middle proposition.
To achieve the above object, the invention provides the following technical scheme:
A kind of superduty ductile cast iron manhole cover production technology, comprising the following steps:
S1: selecting the degree of packing is the clay-bonded sand and water-based graphite coating of 75-85, and enclosed running gate system is selected in casting,
Sprue: cross gate: ingate ratio is 1.25:2:1-1.25, sets sprue cup in sprue, and cross gate uses semi-annular shape,
And slag trap is set, ingate four is simultaneously vertically opened up in horn-like, is finally filled type position in molten iron and is stayed riser runner；
S2: with the pig iron of 25-40%, the foundry return of 15-25%, the steel scrap of 25-50%, the ferrosilicon of 3-5% and 5-8%
Manganese iron is put into for furnace charge carries out melting 20-30min in electric furnace, and 1750-1800 DEG C of temperature；
S3: after furnace charge is in a molten state, the molten iron of selection 3.6-4.1% carbon content, addition 0.7-1.3% silicon,
0.3-0.4% manganese, in high-temperature electric resistance furnace continue melting 30-40min, 1450-1500 DEG C of temperature；
S4: inoculant alloy is preheated in crucible, the SiC grain and 2-2.5% that covering 15-20% partial size is 1-5 millimeters
NaHCO3 is consolidated, heat preservation；
S5: stokehold spheroidising pours mode using dam-type packet bottom, S4 resulting material is placed on the one of casting ladle bottom dykes and dams
S3 resulting material is once gone out sufficient iron liquid, finishes to nodularization, skim immediately by side, is sprinkled into perlite collection slag, heat preservation, bonded hard ferrite magnet
It is down to 1350-1400 DEG C to be poured, keeps sprue cup to be in full state, do not stop, ball iron manhole cover structure skin depth 30-50 milli
Rice, wall thickness are 4-8 millimeters, and spacing is uniform, and transition is gentle.
Further, charge composition in S2 are as follows: the pig iron 25%, foundry return 15%, steel scrap 50%, ferrosilicon 3% and manganese iron
7%；Add the molten iron of 3.6% carbon content in S3,0.7% silicon and 0.3% manganese.
Further, charge composition in S2 are as follows: the pig iron 40%, foundry return 25%, steel scrap 25%, ferrosilicon 5% and manganese iron
5%；The molten iron of 4.1% carbon content, 1.3% silicon and 0.4% manganese are added in S3.
Further, charge composition in S2 are as follows: the pig iron 30%, foundry return 20%, steel scrap 40%, ferrosilicon 4% and manganese iron
6%；Add the molten iron of 3.8% carbon content in S3,1.0% silicon and 0.35% manganese.
Further, the material additive amount in S3, S4 is matched with the furnace charge amount in S2.
Further, the additive amount of the nodulizer in S4 is 2.5-3%.
Compared with prior art, the beneficial effects of the present invention are:
1, a kind of superduty ductile cast iron manhole cover production technology provided by the invention, with the pig iron, foundry return, steel scrap, ferrosilicon
It is that furnace charge carries out melting casting with manganese iron, improves the processing intensity of ductile cast iron manhole cover, while can satisfy superduty well lid
Production requirement.
2, a kind of superduty ductile cast iron manhole cover production technology provided by the invention, is added appropriate carbon in the furnace charge of melting
The molten iron of content, suitable silicon and manganese can prevent shrinkage porosite and crackle and prevent free carburizing when carbon amounts is close to eutectic point
The appearance of body is conducive to furnace charge spheroidization of graphite, and silicon can refine graphite in spheroidal graphite cast-iron, improve the roundness of graphite nodule, have
It conducive to ferrite is formed, prevents that cementite, molten iron are come out of the stove in high temperature, be conducive to desulfurization, degasification, purifying molten iron and strengthen pregnant
It educates, friction condition can be improved using water-based graphite coating, reduce flow resistance, sprue adds sprue cup to be entirely poured to guarantee
System has enough static pressures, prevents cold shut.
3, a kind of superduty ductile cast iron manhole cover production technology provided by the invention can be appropriate using SiC as inorganic agent
Carbon equivalent is improved, reduces cost, while improving the metallurgy condition of iron liquid, strengthens reproducibility, mitigates the unfavorable of corrosion furnace charge
Effect increases the number of graphite ball of spheroidal graphite cast-iron unit area, improves Oxygen potential, reduces non-metallic inclusion and slag, eliminates contracting
The casting flaws such as hole, shrinkage porosite, subcutaneous blowhole, so that product matrix refines, size of graphite ball reaches 6 grades or more, mechanicalness
It can stablize, improve superduty ductile cast iron manhole cover and produce qualification rate.
Detailed description of the invention
Fig. 1 is process flow chart of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment one:
Referring to Fig. 1, in the embodiment of the present invention: providing a kind of superduty ductile cast iron manhole cover production technology, including following
Step:
Step 1: selecting the degree of packing is the clay-bonded sand and water-based graphite coating of 75-85, enclosed casting system is selected in casting
System, sprue: cross gate: ingate ratio is 1.25:2:1-1.25, sets sprue cup in sprue, cross gate uses semicircular ring
Shape, and slag trap is set, ingate four is simultaneously vertically opened up in horn-like, is finally filled type position in molten iron and is stayed riser runner；
Step 2: charge composition: being furnace charge with the pig iron 25%, foundry return 15%, steel scrap 50%, ferrosilicon 3% and manganese iron 7%
It puts into and carries out melting 20-30min in electric furnace, 1750-1800 DEG C of temperature；
Step 3: selecting the molten iron of 3.6% carbon content after furnace charge is in a molten state, 0.7% silicon, 0.3% is added
Manganese, in high-temperature electric resistance furnace continue melting 30-40min, 1450-1500 DEG C of temperature；
Step 4: 2.5% inoculant alloy is preheated in crucible, the SiC grain that covering 15-20% partial size is 1-5 millimeters
And 2-2.5%NaHCO3, it consolidates, heat preservation；
Step 5: stokehold spheroidising, pours mode using dam-type packet bottom, the 4th step resulting material is placed on casting ladle bottom
Third step resulting material is once gone out sufficient iron liquid, finishes to nodularization, skim immediately by the side of dykes and dams, is sprinkled into perlite collection slag, is protected
Temperature, bonded hard ferrite magnet are down to 1350-1400 DEG C and are poured, and keep sprue cup to be in full state, do not stop, ball iron manhole cover structure
30-50 millimeters of skin depth, wall thickness is 4-8 millimeters, and spacing is uniform, and transition is gentle.
Embodiment two:
In the embodiment of the present invention: a kind of superduty ductile cast iron manhole cover production technology is provided, comprising the following steps:
Step 1: selecting the degree of packing is the clay-bonded sand and water-based graphite coating of 75-85, enclosed casting system is selected in casting
System, sprue: cross gate: ingate ratio is 1.25:2:1-1.25, sets sprue cup in sprue, cross gate uses semicircular ring
Shape, and slag trap is set, ingate four is simultaneously vertically opened up in horn-like, is finally filled type position in molten iron and is stayed riser runner；
Step 2: charge composition: being furnace charge with the pig iron 40%, foundry return 25%, steel scrap 25%, ferrosilicon 5% and manganese iron 5%
It puts into and carries out melting 20-30min in electric furnace, 1750-1800 DEG C of temperature；
Step 3: selecting the molten iron of 4.1% carbon content after furnace charge is in a molten state, 1.3% silicon, 0.4% manganese is added
Manganese, in high-temperature electric resistance furnace continue melting 30-40min, 1450-1500 DEG C of temperature；
Step 4: 3% inoculant alloy is preheated in crucible, SiC grain that covering 15-20% partial size is 1-5 millimeter with
2-2.5%NaHCO3 is consolidated, heat preservation；
Step 5: stokehold spheroidising, pours mode using dam-type packet bottom, the 4th step resulting material is placed on casting ladle bottom
Third step resulting material is once gone out sufficient iron liquid, finishes to nodularization, skim immediately by the side of dykes and dams, is sprinkled into perlite collection slag, is protected
Temperature, bonded hard ferrite magnet are down to 1350-1400 DEG C and are poured, and keep sprue cup to be in full state, do not stop, ball iron manhole cover structure
30-50 millimeters of skin depth, wall thickness is 4-8 millimeters, and spacing is uniform, and transition is gentle.
Embodiment three:
In the embodiment of the present invention: a kind of superduty ductile cast iron manhole cover production technology is provided, comprising the following steps:
Step 1: selecting the degree of packing is the clay-bonded sand and water-based graphite coating of 75-85, enclosed casting system is selected in casting
System, sprue: cross gate: ingate ratio is 1.25:2:1-1.25, sets sprue cup in sprue, cross gate uses semicircular ring
Shape, and slag trap is set, ingate four is simultaneously vertically opened up in horn-like, is finally filled type position in molten iron and is stayed riser runner；
Step 2: charge composition: being furnace charge with the pig iron 40%, foundry return 25%, steel scrap 25%, ferrosilicon 5% and manganese iron 5%
It puts into and carries out melting 20-30min in electric furnace, 1750-1800 DEG C of temperature；
Step 3: selecting the molten iron of 4.1% carbon content after furnace charge is in a molten state, 1.3% silicon, 0.4% manganese is added
Manganese, in high-temperature electric resistance furnace continue melting 30-40min, 1450-1500 DEG C of temperature；
Step 4: the inoculant alloy by 2.8% preheats in crucible, the SiC that covering 15-20% partial size is 1-5 millimeters
Grain and 2-2.5%NaHCO3 are consolidated, heat preservation；
Step 5: stokehold spheroidising, pours mode using dam-type packet bottom, the 4th step resulting material is placed on casting ladle bottom
Third step resulting material is once gone out sufficient iron liquid, finishes to nodularization, skim immediately by the side of dykes and dams, is sprinkled into perlite collection slag, is protected
Temperature, bonded hard ferrite magnet are down to 1350-1400 DEG C and are poured, and keep sprue cup to be in full state, do not stop, ball iron manhole cover structure
30-50 millimeters of skin depth, wall thickness is 4-8 millimeters, and spacing is uniform, and transition is gentle.
In summary: a kind of superduty ductile cast iron manhole cover production technology provided by the invention with the pig iron, foundry return, is given up
Steel, ferrosilicon and manganese iron are that furnace charge carries out melting casting, improve the processing intensity of ductile cast iron manhole cover, while can satisfy superduty
The production requirement of well lid, secondly, the molten iron of appropriate carbon content is added in the furnace charge of melting, suitable silicon and manganese, when carbon amounts connects
Nearly eutectic point can prevent shrinkage porosite and crackle and prevent the appearance of free cementite, be conducive to furnace charge spheroidization of graphite, and silicon
Graphite can be refined in spheroidal graphite cast-iron, the roundness of graphite nodule is improved, advantageously forms ferrite, prevent cementite, iron
Water is come out of the stove in high temperature, is conducive to desulfurization, degasification, purifying molten iron and intensive inoculation, can improve fricting strip using water-based graphite coating
Part, reduces flow resistance, and sprue adds sprue cup to guarantee that entire running gate system has enough static pressures, prevents cold
Every；In addition, the present invention can properly increase carbon equivalent using SiC as inorganic agent, cost is reduced, while improving the smelting of iron liquid
Gold bar part strengthens reproducibility, mitigates the detrimental effect of corrosion furnace charge, increases the number of graphite ball of spheroidal graphite cast-iron unit area, mentions
High Oxygen potential reduces non-metallic inclusion and slag, the casting flaws such as shrinkage cavity and porosity, subcutaneous blowhole is eliminated, so that product matrix
Structure refinement, size of graphite ball reach 6 grades or more, and stable mechanical performance improves superduty ductile cast iron manhole cover and produces qualification rate.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art within the technical scope of the present disclosure, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of superduty ductile cast iron manhole cover production technology, which comprises the following steps:
S1: selecting the degree of packing is the clay-bonded sand and water-based graphite coating of 75-85, and casting is selected enclosed running gate system, directly poured
Road: cross gate: ingate ratio is 1.25:2:1-1.25, sets sprue cup in sprue, cross gate uses semi-annular shape, and sets
Slag trap, ingate four simultaneously vertically open up in horn-like, finally fill type position in molten iron and stay riser runner；
S2: with the manganese iron of the pig iron of 25-40%, the foundry return of 15-25%, the steel scrap of 25-50%, the ferrosilicon of 3-5% and 5-8%
It is put into for furnace charge and carries out melting 20-30min in electric furnace, 1750-1800 DEG C of temperature；
S3: after furnace charge is in a molten state, the molten iron of 3.6-4.1% carbon content is selected, 0.7-1.3% silicon, 0.3- is added
0.4% manganese, in high-temperature electric resistance furnace continue melting 30-40min, 1450-1500 DEG C of temperature；
S4: inoculant alloy is preheated in crucible, the SiC grain and 2-2.5% that covering 15-20% partial size is 1-5 millimeters
NaHCO3 is consolidated, heat preservation；
S5: stokehold spheroidising pours mode using dam-type packet bottom, S4 resulting material is placed on to the side of casting ladle bottom dykes and dams,
S3 resulting material is once gone out to sufficient iron liquid, finishes to nodularization, skims immediately, is sprinkled into perlite collection slag, heat preservation, bonded hard ferrite magnet is down to
1350-1400 DEG C is poured, and is kept sprue cup to be in full state, is not stopped, 30-50 millimeters of ball iron manhole cover structure skin depth,
Wall thickness is 4-8 millimeters, and spacing is uniform, and transition is gentle.
2. a kind of superduty ductile cast iron manhole cover production technology as described in claim 1, which is characterized in that charge composition in S2
Are as follows: the pig iron 25%, foundry return 15%, steel scrap 50%, ferrosilicon 3% and manganese iron 7%；The molten iron of 3.6% carbon content is added in S3,
0.7% silicon and 0.3% manganese.
3. a kind of superduty ductile cast iron manhole cover production technology as described in claim 1, which is characterized in that charge composition in S2
Are as follows: the pig iron 40%, foundry return 25%, steel scrap 25%, ferrosilicon 5% and manganese iron 5%；The molten iron of 4.1% carbon content is added in S3,
1.3% silicon and 0.4% manganese.
4. a kind of superduty ductile cast iron manhole cover production technology as described in claim 1, which is characterized in that charge composition in S2
Are as follows: the pig iron 30%, foundry return 20%, steel scrap 40%, ferrosilicon 4% and manganese iron 6%；The molten iron of 3.8% carbon content is added in S3,
1.0% silicon and 0.35% manganese.
5. a kind of superduty ductile cast iron manhole cover production technology as described in claim 1, which is characterized in that the object in S3, S4
Material additive amount is matched with the furnace charge amount in S2.
6. a kind of superduty ductile cast iron manhole cover production technology as described in claim 1, which is characterized in that the nodulizer in S4
Additive amount be 2.5-3%.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0317366A1 (en) * | 1987-11-20 | 1989-05-24 | Honda Giken Kogyo Kabushiki Kaisha | Process for producing nodular 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 |
| CN108220763A (en) * | 2018-03-05 | 2018-06-29 | 苏州特鑫精密电子有限公司 | A kind of casting process of handware antifriction alloy |
| CN108838326A (en) * | 2018-08-27 | 2018-11-20 | 安徽大来机械制造有限公司 | A kind of processing method of cast condition ductile iron well lid |
| CN109852874A (en) * | 2019-04-12 | 2019-06-07 | 荆州市巨鲸传动机械有限公司 | A kind of preparation method of optimizing components type QT600-3 spheroidal graphite cast-iron |
| 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 |
-
2019
- 2019-08-28 CN CN201910799509.XA patent/CN110396640A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0317366A1 (en) * | 1987-11-20 | 1989-05-24 | Honda Giken Kogyo Kabushiki Kaisha | Process for producing nodular 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 |
| CN108220763A (en) * | 2018-03-05 | 2018-06-29 | 苏州特鑫精密电子有限公司 | A kind of casting process of handware antifriction alloy |
| CN108838326A (en) * | 2018-08-27 | 2018-11-20 | 安徽大来机械制造有限公司 | A kind of processing method of cast condition ductile iron well lid |
| CN109852874A (en) * | 2019-04-12 | 2019-06-07 | 荆州市巨鲸传动机械有限公司 | A kind of preparation method of optimizing components type QT600-3 spheroidal graphite cast-iron |
| 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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