CN105886693A - Smelting method for medium-strength and high-ductility ductile cast iron - Google Patents
Smelting method for medium-strength and high-ductility ductile cast iron Download PDFInfo
- Publication number
- CN105886693A CN105886693A CN201610320754.4A CN201610320754A CN105886693A CN 105886693 A CN105886693 A CN 105886693A CN 201610320754 A CN201610320754 A CN 201610320754A CN 105886693 A CN105886693 A CN 105886693A
- Authority
- CN
- China
- Prior art keywords
- iron
- molten iron
- smelting
- mass parts
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- 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 relates to a smelting method for medium-strength and high-ductility ductile cast iron. Ductile cast iron castings are manufactured through feeding and smelting, constituent fine adjusting, molten iron pre-treating, molten iron refining, spheroidizing and casting forming. The smelting method has the advantages that pig iron is added finally in the feeding process, and burning loss of crystalline cores in molten iron can be prevented; carbon and silicon carbide are added simultaneously in the pre-treating process, 1/3 of the molten iron needs to be poured out from a furnace, the liquid level of the molten iron left in the furnace can be located below an induction coil of the electric furnace, the stirring strength is improved when the molten iron is heated, and therefore the molten iron can fully absorb the carbon and the silicon carbide, and the pre-treating effect is guaranteed; the secondary inoculation treatment process is adopted for the inoculation treatment, inoculants are added into balling tundishes when the weight of balled output iron accounts for 1/3 of the weight of output iron, and therefore inoculation of the molten iron is fully guaranteed, the strength of the manufactured ductile cast iron can reach the medium strength, and the ductility is high.
Description
Technical field
The invention belongs to chemistry melting field, particularly to the method for smelting of a kind of moderate strength high-elongation magnesium iron.
Background technology
Spheroidal graphite cast-iron is that the graphite in cast iron presents spherical a kind of cast iron, makes graphite be formed by spheroidising spherical,
This globular graphite can make stress collection medium and small, reduces and isolates matrix.Owing to the intensity of spheroidal graphite cast-iron, degree of moulding, toughness are high, tired
Labor intensity is close to medium carbon steel, and wearability is better than non-alloyed steel, and cutting ability can compare favourably with casting pig, and low cost of manufacture etc. is excellent
Point, it receives and is widely applied.
In the production process of spheroidal graphite cast-iron, will can form ferrum liquid, the quality of ferrum liquid, ball after the melting sources of different ratio
Change inoculation effects etc. have conclusive effect to the quality of foundry goods.The quality of ferrum liquid is good, then can form number during solidification
Measure more, less graphite nodule and eutectic cell, graphite nodule and eutectic cell the most, the most tiny, then swelling stress when foundry goods is formed
The biggest, it is thus possible to more effectively overcome matrix to loosen, improve the mechanical property of spheroidal graphite cast-iron.Therefore, the quality of ferrum liquid with
The quality of final spheroidal graphite cast-iron has direct relation, the quality of ferrum liquid each unit directly and in the proportioning of raw material and raw material again
The content of element chemical constituent has direct relation.The another one factor affecting spheroidal graphite cast-iron quality is nodularization process, at nodularization
The purpose of reason is to make spheroidization of graphite, removes sulfur and oxygen isoreactivity element simultaneously.It is known that in the preparation process of spheroidal graphite cast-iron
In, it is desirable to sulfur content The more the better, generally believe that sulfur is a kind of harmful element, its existence can destroy the shape of graphite forming core
One-tenth process, and then affect the mechanical property etc. of spheroidal graphite cast-iron；It addition, during nodularization, spheroidizing reacion speed and whole nodularization are anti-
Decide the absorbance of magnesium, the roundness of graphite, quantity and distribution situation between Ying Shi, and these factors can affect spheroidal graphite cast-iron
Mechanical property.At present, conventional maker is when producing QT600 material, and general elongation percentage can only achieve 5-7, although reaches
The standard that in GB, regulation elongation percentage is the most qualified more than 3, remains at performance on the low side.
For above-mentioned phenomenon, China Patent No. CN 104878275 A proposes a kind of high-strength high-elongation ratio magnesium iron casting
The production technology of part, is carried out in the steps below: (1) adds 18-22 part smelting scrap steel in electric furnace, adds 58-62 part and melts down
Material, the texturizing agents and the 18-22 part pig iron that are finally simultaneously introduced 0.5 part carry out melting, form base iron；(2) by nodulizer
The nodularization joining nodularization bag is indoor, then is covered on nodulizer by inovulant, is then covered on inovulant by silicon steel sheet,
After texturizing agents is added in nodularization bag；(3) temperature in electric furnace is controlled the base iron of 1460-1480 DEG C in nodularization bag
Whole molten iron is formed after reaction；(4) molten iron at end is poured into casting mold, after cooling, obtain iron casting.But this production technology still suffer from
Lower defect: the 1. quality of molten iron can not be improved；2. it is only applicable to the production of high-strength high-elongation ratio magnesium iron, not
It is applicable to the production of moderate strength high-elongation magnesium iron；3. though the elongation percentage of magnesium iron is improved, but still not good enough.
Summary of the invention
The technical problem to be solved in the present invention is to provide the method for smelting of a kind of moderate strength high-elongation magnesium iron, this melting
Method can not only prevent the scaling loss of crystal type core in molten iron, improves molten steel quality, moreover it is possible on the basis of the intensity ensureing magnesium iron,
Increase substantially elongation percentage.
For solving above-mentioned technical problem, the technical scheme is that the melting of a kind of moderate strength high-elongation magnesium iron
Method, its innovative point is: described method of smelting is carried out in the steps below:
(1) charging melting: be simultaneously introduced carburant and the smelting scrap steel of 28-32 mass parts of 1.0-1.1 mass parts in electric furnace,
It is subsequently adding the foundry returns of 38-42 mass parts, adds the ferrosilicon of 0.93-1.0 mass parts, be eventually adding 28-32 mass parts
The pig iron carries out melting；
(2) trimming: in electric furnace, molten iron is warmed up to 1420～1440 DEG C, by add 0.3-0.4 mass parts ferromanganese and
The cathode copper of 0.2-0.3 mass parts, is adjusted to the scope that base iron requires；
(3) molten iron pretreatment: pour out the molten iron of 1/3 after molten iron is warmed up to 1450～1470 DEG C in stove from electric furnace in ladle
In, in electric furnace, then add 1 mass parts carbon and the carborundum of 1 mass parts together, simultaneously by peak power by electric furnace liter
Temperature, and the molten iron of pour out 1/3 is backed in electric furnace；
(4) molten iron refine: molten iron temperature in stove is risen to 1500～1520 DEG C, is incubated, stands 5～10 minutes, makes molten iron chemistry
Composition reaches uniform state；
(5) spheroidising:
A., the nodularization that nodulizer joins spheroidizing reacion bag is indoor, then is covered on nodulizer by an inovulant, finally will
Silicon steel sheet covers on an inovulant；
B. come out of the stove when molten iron temperature reaches 1480-1500 DEG C in spheroidizing reacion bag, go out 1/3 to total weight of molten iron at molten iron
Time, in addition post inoculant to spheroidizing reacion bag, more remaining molten iron is come out of the stove to spheroidizing reacion bag, form whole ferrum
Water；
(6) foundry goods molding: after nodularization terminates, pours into casting mold in 12min by molten iron at end, and cooling obtains iron casting.
Further, described steel scrap uses low manganese steel scrap, and the mass fraction of its each constituent is respectively C:0.018%,
Si:0.10%, Mn:0.13 %, P:0.05%, S:0.017%, Cr:0.05%, Ti:0.038%, V:0.040%, surplus is ferrum.
Further, the described pig iron uses the Q10 pig iron, and the mass fraction of its each constituent is respectively C:4.31%, Si:
0.86%, Mn:0.09%, P:0.026%, S:0.006%, Cr:0.013%, Ti:0.015%, V:0.010%, surplus is ferrum.
Further, described nodulizer uses rare earth silicon and magnesium composite nodulizer, and its each constituent mass fraction is respectively
Mg:5.65%, Al:0.22%, Si:46.77 %, Ca:1.15%, RE:2.8%, surplus is ferrum.
Further, a described inovulant and post inoculant use silicon titanate innoculant, and its each constituent quality is divided
Number is respectively Si:66%, Ba:1.16%, surplus is Fe；The addition of inovulant is the 0.2% of base iron weight, and secondary is pregnant
Educate addition is base iron weight the 0.2% of agent.
Further, in described base iron, the mass fraction of each constituent is respectively C:3.80～3.90%, Si:1.75
～1.85%, Mn:0.38～0.42%, P≤0.03%, S:0.020～0.030%, Cu:0.25～0.30%, surplus is ferrum.
Further, in described whole molten iron, the mass fraction of each constituent is respectively C:3.65～3.75%, Si:2.50
～2.60%, Mn:0.38～0.42%, P≤0.03%, S:0.010～0.018%, Mg:0.040～0.050%, surplus is ferrum.
Further, in described step (3), the granularity of carbon is 3～8mm, and its addition is the 0.4% of base iron weight, carbon
The granularity of SiClx is 3～8mm, and its addition is the 0.2% of base iron weight.
Further, in described step (5) addition is base iron weight the 1.0% of nodulizer, adding of an inovulant
Enter that amount is base iron weight 0.3%, the addition of silicon steel sheet is the 0.5% of base iron weight.
It is an advantage of the current invention that: the method for smelting of moderate strength high-elongation magnesium iron of the present invention, in charging, the pig iron is last
Add, it is ensured that in the pig iron, crystal type core is not by serious scaling loss, provides sufficient crystal type for the nodularization of graphite in later stage molten iron
Core；
Pretreatment uses the method that carbon and carborundum are simultaneously introduced, and needs to pour out the molten iron of 1/3 in stove, molten iron remaining in such stove
Liquid level be in below electric furnace induction coil, molten iron heat up time increase stirring dynamics, make molten iron can fully absorb C and
SiC, it is ensured that the effect of pretreatment；Electric furnace peak power is heated up, it is therefore an objective to make molten iron in electric furnace produce hump existing simultaneously
As, it is ensured that carbon and carborundum are fully contacted with molten iron；
Inoculation use late inoculation process technique, and nodularization tap a blast furnace to weight of tapping a blast furnace 1/3 time add again in nodularization bag
Enter inovulant, fully ensure that breeding of molten iron；
In fusion process, strict control the content of Mn and Cu in molten iron chemical composition, having lacked then intensity can on the low side, height elongation percentage
Can be on the low side, and then both ensure that intensity, in turn ensure that elongation percentage；
Liquid iron balling must be poured into a mould in 12 minutes after processing and terminate, and otherwise can affect final mechanical property by spheroidization and inoculation declined
Energy；By the method for smelting of the present invention, the intensity of prepared magnesium iron can reach moderate strength, and elongation percentage is high.
Detailed description of the invention
The following examples can make professional and technical personnel that the present invention is more fully understood, but the most therefore by this
Bright it is limited among described scope of embodiments.
Embodiment 1
The method of smelting of the present embodiment moderate strength high-elongation magnesium iron, this method of smelting is carried out in the steps below:
(1) charging melting: be simultaneously introduced the carburant of 1.0 mass parts and the low manganese smelting scrap steel of 32 mass parts in electric furnace, low
In manganese steel scrap, the mass fraction of each constituent is respectively C:0.018%, Si:0.10%, Mn:0.13 %, P:0.05%, S:
0.017%, Cr:0.05%, Ti:0.038%, V:0.040%, surplus is Fe；It is subsequently adding the foundry returns of 42 mass parts, adds
The ferrosilicon of 1.0 mass parts, the Q10 pig iron being eventually adding 32 mass parts carries out melting, forms base iron, respectively form in the Q10 pig iron
The mass fraction of composition is respectively C:4.31%, Si:0.86%, Mn:0.09%, P:0.026%, S:0.006%, Cr:0.013%, Ti:
0.015%, V:0.010%, surplus is Fe；In base iron, the mass fraction of each constituent is respectively C:3.80%, Si:
1.85%, Mn:0.42%, P:0.03%, S:0.030%, Cu:0.30%, surplus is Fe；
(2) trimming: in electric furnace, molten iron is warmed up to 1440 DEG C, by adding ferromanganese and the electricity of 0.3 mass parts of 0.3 mass parts
Solve copper, be adjusted to the scope that base iron requires；
(3) molten iron pretreatment: pouring out the molten iron of 1/3 from electric furnace in ladle, then adding granularity in electric furnace together is
5mm carbon and carborundum, the addition of carbon is the 0.4% of base iron weight, the addition of carborundum be base iron weight 0.2% with
Time electric furnace peak power heat up, and the molten iron of pour out 1/3 is backed in electric furnace；
(4) molten iron refine: molten iron temperature in stove is risen to 1500 DEG C, is incubated, stands 5 minutes, make molten iron chemical composition reach equal
Even state；
(5) spheroidising:
A., the nodularization that rare earth silicon and magnesium composite nodulizer joins spheroidizing reacion bag is indoor, and its addition is base iron weight
1.0%, silicon magnesium composite nodulizer each constituent mass fraction is respectively Mg:5.65%, Al:0.22%, Si:46.77 %, Ca:
1.15%, RE:2.8%, surplus is Fe；Again a silicon being covered barium inovulant and cover on silicon magnesium composite nodulizer, its addition is former
The 0.2% of weight of molten iron, silicon titanate innoculant each constituent mass fraction is respectively Si:66%, Ba:1.16%, surplus is Fe；?
After by silicon steel sheet cover on a silicon titanate innoculant, its addition is the 0.5% of base iron weight；
B. come out of the stove when molten iron temperature reaches 1480 DEG C in spheroidizing reacion bag, molten iron go out to total weight of molten iron 1/3 time, add
Entering post inoculant in spheroidizing reacion bag, its addition is the 0.2% of base iron weight, is come out of the stove by the most remaining molten iron
To spheroidizing reacion bag, forming whole molten iron, in whole molten iron, the mass fraction of each constituent is respectively C:3.65%, Si:
2.60%, Mn:0.42%, P:0.03%, S:0.018%, Mg:0.050%, surplus is Fe；
(6) foundry goods molding: after nodularization terminates, pours into casting mold in 12min by molten iron at end, and cooling obtains iron casting.
Embodiment 2
The method of smelting of the present embodiment moderate strength high-elongation magnesium iron, this method of smelting is carried out in the steps below:
(1) charging melting: be simultaneously introduced the carburant of 1.05 mass parts and the low manganese smelting scrap steel of 30 mass parts in electric furnace, low
In manganese steel scrap, the mass fraction of each constituent is respectively C:0.018%, Si:0.10%, Mn:0.13 %, P:0.05%, S:
0.017%, Cr:0.05%, Ti:0.038%, V:0.040%, surplus is Fe；It is subsequently adding the foundry returns of 40 mass parts, adds
The ferrosilicon of 0.96 mass parts, the Q10 pig iron being eventually adding 30 mass parts carries out melting, forms base iron, respectively form in the Q10 pig iron
The mass fraction of composition is respectively C:4.31%, Si:0.86%, Mn:0.09%, P:0.026%, S:0.006%, Cr:0.013%, Ti:
0.015%, V:0.010%, surplus is Fe；In base iron, the mass fraction of each constituent is respectively C:3.85%, Si:1.8%,
Mn:0.4%, P:0.0:2%, S:0.025%, Cu:0.28%, surplus is Fe；
(2) trimming: in electric furnace, molten iron is warmed up to 1450 DEG C, by adding the ferromanganese of 0.35 mass parts and 0.25 mass parts
Cathode copper, is adjusted to the scope that base iron requires；
(3) molten iron pretreatment: pouring out the molten iron of 1/3 from electric furnace in ladle, then adding granularity in electric furnace together is
5mm carbon and carborundum, the addition of carbon is the 0.4% of base iron weight, the addition of carborundum be base iron weight 0.2% with
Time electric furnace peak power heat up, and the molten iron of pour out 1/3 is backed in electric furnace；
(4) molten iron refine: molten iron temperature in stove is risen to 1510 DEG C, is incubated, stands 8 minutes, make molten iron chemical composition reach equal
Even state；
(5) spheroidising:
A., the nodularization that rare earth silicon and magnesium composite nodulizer joins spheroidizing reacion bag is indoor, and its addition is base iron weight
1.0%, silicon magnesium composite nodulizer each constituent mass fraction is respectively Mg:5.65%, Al:0.22%, Si:46.77 %, Ca:
1.15%, RE:2.8%；Again a silicon being covered barium inovulant and cover on silicon magnesium composite nodulizer, its addition is base iron weight
0.2%, silicon titanate innoculant each constituent mass fraction is respectively Si:66%, Ba:1.16%, surplus is Fe；Finally by silicon steel sheet
Covering on a silicon titanate innoculant, its addition is the 0.5% of base iron weight；
B. come out of the stove when molten iron temperature reaches 1490 DEG C in spheroidizing reacion bag, molten iron go out to total weight of molten iron 1/3 time, add
Entering post inoculant in spheroidizing reacion bag, its addition is the 0.2% of base iron weight, is come out of the stove by the most remaining molten iron
To spheroidizing reacion bag, forming whole molten iron, in whole molten iron, the mass fraction of each constituent is respectively C:3.7%, Si:2.55%,
Mn:0.4%, P:0.0:2%, S:0.014%, residual Mg:0.045%；
(6) foundry goods molding: after nodularization terminates, pours into casting mold in 12min by molten iron at end, and cooling obtains iron casting.
Embodiment 3
The method of smelting of the present embodiment moderate strength high-elongation magnesium iron, this method of smelting is carried out in the steps below:
(1) charging melting: be simultaneously introduced the carburant of 1.1 mass parts and the low manganese smelting scrap steel of 28 mass parts in electric furnace, low
In manganese steel scrap, the mass fraction of each constituent is respectively C:0.018%, Si:0.10%, Mn:0.13 %, P:0.05%, S:
0.017%, Cr:0.05%, Ti:0.038%, V:0.040%, surplus is Fe；It is subsequently adding the foundry returns of 38 mass parts, adds
The ferrosilicon of 0.93 mass parts, the Q10 pig iron being eventually adding 28 mass parts carries out melting, forms base iron, respectively form in the Q10 pig iron
The mass fraction of composition is respectively C:4.31%, Si:0.86%, Mn:0.09%, P:0.026%, S:0.006%, Cr:0.013%, Ti:
0.015%, V:0.010%, surplus is Fe；In base iron, the mass fraction of each constituent is respectively C:3.90%, Si:
1.75%, Mn:0.38%, P:0.01%, S:0.020%, Cu:0.25%；
(2) trimming: in electric furnace, molten iron is warmed up to 1460 DEG C, by adding ferromanganese and the electricity of 0.2 mass parts of 0.4 mass parts
Solve copper, be adjusted to the scope that base iron requires；
(3) molten iron pretreatment: pouring out the molten iron of 1/3 from electric furnace in ladle, then adding granularity in electric furnace together is
5mm carbon and carborundum, the addition of carbon is the 0.4% of base iron weight, the addition of carborundum be base iron weight 0.2% with
Time electric furnace peak power heat up, and the molten iron of pour out 1/3 is backed in electric furnace；
(4) molten iron refine: molten iron temperature in stove is risen to 1500～1520 DEG C, is incubated, stands 5～10 minutes, makes molten iron chemistry
Composition reaches uniform state；
(5) spheroidising:
A., the nodularization that rare earth silicon and magnesium composite nodulizer joins spheroidizing reacion bag is indoor, and its addition is base iron weight
1.0%, silicon magnesium composite nodulizer each constituent mass fraction is respectively Mg:5.65%, Al:0.22%, Si:46.77 %, Ca:
1.15%, RE:2.8%；Again a silicon being covered barium inovulant and cover on silicon magnesium composite nodulizer, its addition is base iron weight
0.2%, silicon titanate innoculant each constituent mass fraction is respectively Si:66%, Ba:1.16%, surplus is Fe；Finally by silicon steel sheet
Covering on a silicon titanate innoculant, its addition is the 0.5% of base iron weight；
B. come out of the stove when molten iron temperature reaches 1500 DEG C in spheroidizing reacion bag, molten iron go out to total weight of molten iron 1/3 time, add
Entering post inoculant in spheroidizing reacion bag, its addition is the 0.2% of base iron weight, is come out of the stove by the most remaining molten iron
To spheroidizing reacion bag, forming whole molten iron, in whole molten iron, the mass fraction of each constituent is respectively C:3.75%, Si:
2.50%, Mn:0.38%, P:0.01%, S:0.010%, Mg:0.040%；
(6) foundry goods molding: after nodularization terminates, pours into casting mold in 12min by molten iron at end, and cooling obtains iron casting.
Following table is the mechanical property of the magnesium iron that the magnesium iron mechanical property that embodiment 1-3 prepares prepares with tradition.
| Mechanical property | Tensile strength/MPa | Yield strength/MPa | Elongation percentage | Body hardness |
| Embodiment 1 | 551 | 341 | 15 | 192 |
| Embodiment 2 | 560 | 339 | 16 | 197 |
| Embodiment 3 | 546 | 332 | 16 | 188 |
| CN 104878275 A | 610 | 412 | 11 | 226 |
As can be seen from the above table, by preparation method of the present invention, the magnesium iron being prepared into, its intensity can reach medium by force
Degree, tensile strength ＞ 540 MPa, yield strength ＞ 330 MPa, compared with existing hi-strength nodular iron, although intensity is less than high-strength
Degree magnesium iron, but elongation percentage improves, and its elongation percentage is up to 16.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.The skill of the industry
The art personnel simply explanation it should be appreciated that the present invention is not restricted to the described embodiments, described in above-described embodiment and description
The principle of the present invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these
Changes and improvements both fall within scope of the claimed invention.Claimed scope by appending claims and
Its equivalent defines.
Claims (9)
1. the method for smelting of a moderate strength high-elongation magnesium iron, it is characterised in that: described method of smelting enters in the steps below
OK:
(1) charging melting: be simultaneously introduced carburant and the smelting scrap steel of 28-32 mass parts of 1.0-1.1 mass parts in electric furnace,
It is subsequently adding the foundry returns of 38-42 mass parts, adds the ferrosilicon of 0.93-1.0 mass parts, be eventually adding 28-32 mass parts
The pig iron carries out melting；
(2) trimming: in electric furnace, molten iron is warmed up to 1420～1440 DEG C, by add 0.3-0.4 mass parts ferromanganese and
The cathode copper of 0.2-0.3 mass parts, is adjusted to the scope that base iron requires；
(3) molten iron pretreatment: pour out the molten iron of 1/3 after molten iron is warmed up to 1450～1470 DEG C in stove from electric furnace in ladle
In, in electric furnace, then add 1 mass parts carbon and the carborundum of 1 mass parts together, simultaneously by peak power by electric furnace liter
Temperature, and the molten iron of pour out 1/3 is backed in electric furnace；
(4) molten iron refine: molten iron temperature in stove is risen to 1500～1520 DEG C, is incubated, stands 5～10 minutes, makes molten iron chemistry
Composition reaches uniform state；
(5) spheroidising:
A., the nodularization that nodulizer joins spheroidizing reacion bag is indoor, then is covered on nodulizer by an inovulant, finally will
Silicon steel sheet covers on an inovulant；
B. come out of the stove when molten iron temperature reaches 1480-1500 DEG C in spheroidizing reacion bag, go out 1/3 to total weight of molten iron at molten iron
Time, in addition post inoculant to spheroidizing reacion bag, more remaining molten iron is come out of the stove to spheroidizing reacion bag, form whole ferrum
Water；
(6) foundry goods molding: after nodularization terminates, pours into casting mold in 12min by molten iron at end, and cooling obtains iron casting.
The method of smelting of moderate strength high-elongation magnesium iron the most according to claim 1, it is characterised in that: described steel scrap is adopted
With low manganese steel scrap, the mass fraction of its each constituent is respectively C:0.018%, Si:0.10%, Mn:0.13 %, P:0.05%, S:
0.017%, Cr:0.05%, Ti:0.038%, V:0.040%, surplus is ferrum.
The method of smelting of moderate strength high-elongation magnesium iron the most according to claim 1, it is characterised in that: the described pig iron is adopted
Using the Q10 pig iron, the mass fraction of its each constituent is respectively C:4.31%, Si:0.86%, Mn:0.09%, P:0.026%, S:
0.006%, Cr:0.013%, Ti:0.015%, V:0.010%, surplus is ferrum.
The method of smelting of moderate strength high-elongation magnesium iron the most according to claim 1, it is characterised in that: described nodulizer
Using rare earth silicon and magnesium composite nodulizer, its each constituent mass fraction is respectively Mg:5.65%, Al:0.22%, Si:46.77
%, Ca:1.15%, RE:2.8%, surplus is ferrum.
The method of smelting of moderate strength high-elongation magnesium iron the most according to claim 1, it is characterised in that: described the most pregnant
Educating agent and post inoculant uses silicon titanate innoculant, its each constituent mass fraction is respectively Si:66%, Ba:1.16%, remaining
Amount is Fe；The addition of inovulant is the 0.2% of base iron weight, and the addition of post inoculant is base iron weight
0.2%。
The method of smelting of moderate strength high-elongation magnesium iron the most according to claim 1, it is characterised in that: described base iron
In the mass fraction of each constituent be respectively C:3.80～3.90%, Si:1.75～1.85%, Mn:0.38～0.42%, P≤
0.03%, S:0.020～0.030%, Cu:0.25～0.30%, surplus is ferrum.
The method of smelting of moderate strength high-elongation magnesium iron the most according to claim 1, it is characterised in that: described whole molten iron
In the mass fraction of each constituent be respectively C:3.65～3.75%, Si:2.50～2.60%, Mn:0.38～0.42%, P≤
0.03%, S:0.010～0.018%, Mg:0.040～0.050%, surplus is ferrum.
The method of smelting of moderate strength high-elongation magnesium iron the most according to claim 1, it is characterised in that: described step
(3) in, the granularity of carbon is 3～8mm, and its addition is the 0.4% of base iron weight, and the granularity of carborundum is 3～8mm, and it adds
Amount is the 0.2% of base iron weight.
The method of smelting of moderate strength high-elongation magnesium iron the most according to claim 1, it is characterised in that: described step
(5) in, the addition of nodulizer is the 1.0% of base iron weight, and the addition of an inovulant is the 0.3% of base iron weight, silicon
The addition of steel disc is the 0.5% of base iron weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610320754.4A CN105886693B (en) | 2016-05-16 | 2016-05-16 | A kind of method of smelting of moderate strength high-elongation magnesium iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610320754.4A CN105886693B (en) | 2016-05-16 | 2016-05-16 | A kind of method of smelting of moderate strength high-elongation magnesium iron |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105886693A true CN105886693A (en) | 2016-08-24 |
| CN105886693B CN105886693B (en) | 2017-11-03 |
Family
ID=56717580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610320754.4A Active CN105886693B (en) | 2016-05-16 | 2016-05-16 | A kind of method of smelting of moderate strength high-elongation magnesium iron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105886693B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107177711A (en) * | 2017-06-27 | 2017-09-19 | 江苏力源金河铸造有限公司 | A kind of smelting technology of thin-walled Ferrite nodular iron casting |
| US20180274047A1 (en) * | 2016-05-31 | 2018-09-27 | Tenova S.P.A. | Method and apparatus for the production of cast iron, cast iron produced according to said method |
| CN110484810A (en) * | 2019-08-26 | 2019-11-22 | 山东金麒麟股份有限公司 | A kind of spheroidal graphite cast-iron of high-load performance, production method, purposes and brake disc |
| CN110819753A (en) * | 2019-09-06 | 2020-02-21 | 江苏力源金河铸造有限公司 | Smelting process for eliminating broken graphite of thick and large ductile iron piece |
| CN112589059A (en) * | 2020-11-26 | 2021-04-02 | 莱州鸿源台钳制造有限公司 | Casting method for adding trace silicon carbide into pouring ladle |
| CN113084096A (en) * | 2021-04-12 | 2021-07-09 | 江苏精棱铸锻股份有限公司 | Method for manufacturing blade wheel hub of wind driven generator |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4072511A (en) * | 1976-11-26 | 1978-02-07 | Harold Huston | Method of producing silicon containing cast iron |
| CN101358262A (en) * | 2008-09-23 | 2009-02-04 | 上海华新合金有限公司 | Method for producing nodular cast iron crankshaft of large power air-conditioned compressor |
| CN103993221A (en) * | 2014-05-26 | 2014-08-20 | 四川省富邦钒钛制动鼓有限公司 | Vanadium titanium cast iron brake drum and preparation method thereof |
| CN104878275A (en) * | 2015-05-27 | 2015-09-02 | 江苏力源金河铸造有限公司 | Production technology for ductile iron casting with high strength and high ductility |
-
2016
- 2016-05-16 CN CN201610320754.4A patent/CN105886693B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4072511A (en) * | 1976-11-26 | 1978-02-07 | Harold Huston | Method of producing silicon containing cast iron |
| CN101358262A (en) * | 2008-09-23 | 2009-02-04 | 上海华新合金有限公司 | Method for producing nodular cast iron crankshaft of large power air-conditioned compressor |
| CN103993221A (en) * | 2014-05-26 | 2014-08-20 | 四川省富邦钒钛制动鼓有限公司 | Vanadium titanium cast iron brake drum and preparation method thereof |
| CN104878275A (en) * | 2015-05-27 | 2015-09-02 | 江苏力源金河铸造有限公司 | Production technology for ductile iron casting with high strength and high ductility |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180274047A1 (en) * | 2016-05-31 | 2018-09-27 | Tenova S.P.A. | Method and apparatus for the production of cast iron, cast iron produced according to said method |
| US10995379B2 (en) * | 2016-05-31 | 2021-05-04 | Tenova S.P.A. | Method and apparatus for the production of cast iron, cast iron produced according to said method |
| CN107177711A (en) * | 2017-06-27 | 2017-09-19 | 江苏力源金河铸造有限公司 | A kind of smelting technology of thin-walled Ferrite nodular iron casting |
| CN110484810A (en) * | 2019-08-26 | 2019-11-22 | 山东金麒麟股份有限公司 | A kind of spheroidal graphite cast-iron of high-load performance, production method, purposes and brake disc |
| CN110819753A (en) * | 2019-09-06 | 2020-02-21 | 江苏力源金河铸造有限公司 | Smelting process for eliminating broken graphite of thick and large ductile iron piece |
| CN110819753B (en) * | 2019-09-06 | 2021-09-24 | 江苏力源金河铸造有限公司 | Smelting process for eliminating broken graphite of thick and large ductile iron piece |
| CN112589059A (en) * | 2020-11-26 | 2021-04-02 | 莱州鸿源台钳制造有限公司 | Casting method for adding trace silicon carbide into pouring ladle |
| CN113084096A (en) * | 2021-04-12 | 2021-07-09 | 江苏精棱铸锻股份有限公司 | Method for manufacturing blade wheel hub of wind driven generator |
| CN113084096B (en) * | 2021-04-12 | 2022-06-24 | 江苏精棱铸锻股份有限公司 | Method for manufacturing blade wheel hub of wind driven generator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105886693B (en) | 2017-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105886693A (en) | Smelting method for medium-strength and high-ductility ductile cast iron | |
| CN104120332B (en) | High-intensity high-tenacity spheroidal graphite cast-iron 600-10 and production technology thereof | |
| CN103194660B (en) | Manufacturing method of low-temperature ferrite nodular cast iron material | |
| CN103215488B (en) | Method for integrally casting large-sized V-shaped diesel engine body by utilizing nodular cast iron | |
| CN109112390A (en) | A kind of Low-alloy high-strength gray cast iron and its preparation process | |
| CN102071351B (en) | Vermicularizing treatment process of vanadium-titanium vermicular graphite cast iron | |
| CN104775065A (en) | High strength and toughness wear-resistant ductile iron rocking arm and production method thereof | |
| CN107177711A (en) | A kind of smelting technology of thin-walled Ferrite nodular iron casting | |
| CN107119168B (en) | A kind of method of blast-melted short route casting high-quality casting | |
| CN101628323A (en) | Casting process of nodular cast iron planet carrier | |
| CN105861917A (en) | Production method for as-cast high-performance ductile iron QT600-10 by precision-investment casting | |
| CN105385935B (en) | A kind of high silicon molybdenum vermicular cast iron and its production method | |
| CN108004460A (en) | A kind of high-intensity and high-tenacity as cast condition QT800-5 spheroidal graphite cast-iron and its production method | |
| CN105132796B (en) | Middle silicon molybdenum alloy vermicular cast iron glass mold material and preparation method thereof | |
| CN105950954A (en) | Smelting method for high-strength thick and large ductile iron | |
| CN103789481B (en) | High-toughness spherical iron and manufacturing method thereof | |
| CN103627971B (en) | Large gauge drilling tool structural alloy steel and smelting process thereof | |
| CN105200305B (en) | A kind of casting pig and preparation method thereof | |
| CN104878275A (en) | Production technology for ductile iron casting with high strength and high ductility | |
| CN105401064A (en) | Medium silicon molybdenum nodular cast iron and production method thereof | |
| CN114029474B (en) | Nodular cast iron-gray cast iron composite brake drum and preparation method thereof | |
| CN102400032B (en) | Large-cross-section nodular cast iron | |
| CN101805868A (en) | Method for smelting thin-wall ductile iron gearbox | |
| CN105349874A (en) | Preparation method for nodular cast iron | |
| CN112680650A (en) | High-strength nodular cast iron and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |