CN109136726A - A kind of spheroidal graphite cast-iron blank casting method - Google Patents
A kind of spheroidal graphite cast-iron blank casting method Download PDFInfo
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- CN109136726A CN109136726A CN201811030387.XA CN201811030387A CN109136726A CN 109136726 A CN109136726 A CN 109136726A CN 201811030387 A CN201811030387 A CN 201811030387A CN 109136726 A CN109136726 A CN 109136726A
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- Prior art keywords
- iron
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- smelting equipment
- spheroidal graphite
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Classifications
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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
-
- 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
- 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
-
- 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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- 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 present invention relates to spheroidal graphite cast-iron casting method fields, specifically a kind of spheroidal graphite cast-iron blank casting method, it is specific as follows: to press constitutive material weight proportion iron filings 75~90%, steel scrap 5~18%, carburant 1.5~2%, ferrosilicon 1.5~2%, manganese iron 1~1.5% and silicon titanate innoculant 1~1.5%, total 100%, control its chemical component C:3.5~3.9%, Si:2.0~3.1%, Mn:0.3~0.8, P content is less than 0.08%, S content is less than 0.03%, remaining Mg:0.03~0.06%, remaining Re:0.02~0.06%；Carburant is added at one time when raw material is added into smelting equipment for the first time, smelting equipment is begun to warm up；During smelting equipment is heated to 1400~1500 DEG C, divides 3~5 times and add remaining raw material；Chemical composition content is detected, the metal element of shortage is supplemented；A part of potting syrup is poured into ladle, nodulizer is then added and carries out spheroidizing reacion, parcel is then divided to carry out sand mold casting.The casting blank that the present invention produces meets requirement, and production cost substantially reduces.
Description
Technical field
The present invention relates to spheroidal graphite cast-iron casting field, specifically a kind of spheroidal graphite cast-iron blank casting method.
Background technique
In the prior art, the cast raw material of spheroidal graphite cast-iron is mostly to use the pig iron, steel scrap and foundry returns for primary raw material, production
The cost is relatively high, and iron filings due to be it is granular, oxidation is fast, if using iron filings for raw material, direct oxidation can seldom be produced
Molten iron usually also needs that the materials such as prompt industrial scrap are added, even if iron filings proportion is also very limited in this way, such as publication date
For on November 24th, 2010, the Chinese invention patent of Patent No. 201010231762.4: a kind of to be produced using waste scrap iron and waste steel
A kind of method of casting, wherein describing method using scrap production casting, but mass percent shared by waste iron filing only has
30%~55%, other parts still use foundry returns and steel scrap, undoubtedly will significantly if casting can be produced based on iron filings
Production cost is reduced, and meets national environmental protection power conservation requirement.
Summary of the invention
A kind of iron filings quality percentage the purpose of the present invention is to provide spheroidal graphite cast-iron blank casting method, in cast raw material
Than up to 75~90%, and it is able to produce out qualified casting blank, production cost substantially reduces.
The purpose of the present invention is achieved through the following technical solutions:
A kind of spheroidal graphite cast-iron blank casting method, includes the following steps:
Step 1: pressing constitutive material weight proportion iron filings 75~90%, steel scrap 5~18%, carburant 1.5~2%, ferrosilicon
1.5~2%, manganese iron 1~1.5% and silicon titanate innoculant 1~1.5%, add up to 100%, control its chemical component C:3.5~
3.9%, Si:2.0~3.1%, Mn:0.3~0.8, P content less than 0.08%, S content less than 0.03%, remaining Mg:0.03~
0.06%, remaining Re::0.02~0.06%；
Step 2: raw material is added into smelting equipment for the first time, and added material quality is total mass of raw material in step 1
35%~45%, then carburant is added at one time, then smelting equipment is begun to warm up；
Step 3: during the smelting equipment is heated to 1400~1500 DEG C, dividing 3~5 times and add into smelting equipment
Add remaining raw material in step 1, and the material quality added every time is identical, until melting is all added in step 1 surplus stock
Equipment；
Step 4: metal is all fused into molten metal in smelting equipment, detects chemical composition content, and in above-mentioned molten metal
It is middle that the metal element accordingly lacked is added, it is uniformly mixed and forms potting syrup；
Step 5: a part of potting syrup being poured into ladle, the potting syrup poured into ladle, which accounts in step 4, to be poured
Then the 40~50% of fluid injection gross mass are added nodulizer and carry out spheroidizing reacion, the nodulizer quality of the addition is to pour into iron
The 1.0~1.2% of water packet potting syrup quality, make molten metal filing bulb separationization 3~7 minutes in ladle, then pour nodularization is good
Fluid injection divides parcel to carry out sand mold casting, and keeps the temperature 12~20 hours in sand mold, natural cooling molding.
Manganese iron used in raw material contains 95~96%C, silicon titanate innoculant containing 75%Si, carburant containing 75%Mn, ferrosilicon in step 1
Containing 75%Si and 8%Ba.
The nodulizer is QRMg8RE5.
Smelting equipment used is electric furnace.
Advantages of the present invention and good effect are as follows:
1, the present invention is compared with pig iron spheroidal graphite casting, and mechanical performance meets production requirement, but production cost substantially reduces.
2, the present invention produces spheroidal graphite casting using waste iron filing, makes full use of the resources such as scrap, meets national environmental protection energy conservation and want
It asks.
Detailed description of the invention
Fig. 1 is the inspection metallographic microscope of the embodiment of the present invention 1,
Fig. 2 is the test stone figure of the embodiment of the present invention 1,
Fig. 3 is the inspection metallographic microscope of the embodiment of the present invention 2,
Fig. 4 is the test stone figure of the embodiment of the present invention 2,
Fig. 5 is the inspection metallographic microscope of the embodiment of the present invention 3,
Fig. 6 is the test stone figure of the embodiment of the present invention 3.
Specific embodiment
The invention will be further described with reference to the accompanying drawing.
A kind of spheroidal graphite cast-iron blank casting method, includes following steps:
Step 1: pressing constitutive material weight proportion iron filings 75~90%, steel scrap 5~18%, carburant 1.5~2%, ferrosilicon
1.5~2%, manganese iron 1~1.5% and silicon titanate innoculant 1~1.5%, add up to 100%, control its chemical component C:3.5~
3.9%, Si:2.0~3.1%, Mn:0.3~0.8, P content less than 0.08%, S content less than 0.03%, remaining Mg:0.03~
0.06%, remaining Re::0.02~0.06%；
Step 2: raw material is added into smelting equipment for the first time, and added material quality is total mass of raw material in step 1
35%~45%, then carburant is added at one time, then smelting equipment is begun to warm up；
Step 3: during the smelting equipment is heated to 1400~1500 DEG C, dividing 3~5 times and add into smelting equipment
Add remaining raw material in step 1, and the material quality added every time is identical, until melting is all added in step 1 surplus stock
Equipment；
Step 4: metal is all fused into molten metal in smelting equipment, detects chemical composition content, and in above-mentioned molten metal
It is middle that the metal element accordingly lacked is added, it is uniformly mixed and forms potting syrup；
Step 5: a part of potting syrup being poured into ladle, the potting syrup poured into ladle, which accounts in step 4, to be poured
Then the 40~50% of fluid injection gross mass are added nodulizer and carry out spheroidizing reacion, the nodulizer quality of the addition is to pour into iron
The 1.0~1.2% of water packet potting syrup quality, make molten metal filing bulb separationization 3~7 minutes in ladle, then pour nodularization is good
Fluid injection divides parcel to carry out sand mold casting, and keeps the temperature 12~20 hours in sand mold, natural cooling molding.
Wherein manganese iron used in raw material contains 75%Mn, ferrosilicon and contains 95~96%C, nodulizer containing 75%Si, carburant in step 1
Contain 75%Si and 8%Ba for QRMg8RE5, silicon titanate innoculant.
Embodiment 1
By mass percentage, 75% iron filings, 18% steel scrap, 2% carburant, 2% ferrosilicon, 1.5% are taken respectively
Manganese iron and 1.5% silicon titanate innoculant, chemical Composition Control is as shown below:
| Chemical component | C | Si | Mn | P | S | Remaining Mg | Remaining Re |
| Content % | 3.8 | 3.0 | 0.6 | 0.05 | 0.02 | 0.04 | 0.05 |
Raw material is added in smelting equipment in four times, wherein the 40% of total mass of raw material is added for the first time, then by carburant
It is added at one time, during smelting equipment is heated to 1400~1500 DEG C, with the continuous fusing of iron filings, gradually adds iron
Bits, second plus total mass of raw material 20%, the 20% of third time plus total mass of raw material, the 4th time plus total mass of raw material
20%, until smelting equipment is filled up, metal molten is at molten metal, exemplar before pouring furnace, by laboratory detection chemical component
Then content is added corresponding shortage metallic element, and is uniformly mixed, form potting syrup.
The 50% of the potting syrup gross mass melted is poured into ladle, nodulizer progress is then put into ladle
Spheroidizing reacion, the nodulizer quality are pour into ladle potting syrup quality 1.2%, after allowing molten metal filing bulb separationization 7 minutes,
Divide parcel to carry out sand mold casting the good potting syrup of nodularization again, keeps the temperature 12~20 hours in sand mold, natural cooling molding.Subsequent thermal
Processing is using weathering.
Smelting equipment used in the present embodiment is LD500/350kW electric furnace.
The mechanical performance of the present embodiment product testing is as follows:
And the pig iron spheroidal graphite casting mechanical performance of normal process production is as follows:
It is compared by upper two figure it is found that the mechanical performance of the present embodiment product is met the requirements.
The microstructure examination figure of the present embodiment product is as depicted in figs. 1 and 2, and inspection project is Spheroidal Graphite Cast Iron Metallographic Structure-ball
Change classification and evaluation (GB/T9441-2009), judge by comparing method (this is techniques well known), wherein Fig. 1 is this reality
Example diagram is applied, Fig. 2 is standard drawing, and product is qualified.
Embodiment 2
By mass percentage, 90% iron filings, 5% steel scrap, 1.5% carburant, 1.5% ferrosilicon, 1% are taken respectively
Manganese iron and 1% silicon titanate innoculant, chemical Composition Control is as shown below:
| Chemical component | C | Si | Mn | P | S | Remaining Mg | Remaining Re |
| Content % | 3.5 | 2.3 | 0.4 | 0.06 | 0.02 | 0.05 | 0.05 |
Melting process step: raw material is added in furnace in four times, the 40% of total mass of raw material is added for the first time, property adds again
Enter carburant, during smelting equipment is heated to 1400~1500 DEG C, with the continuous fusing of iron filings, addition iron gradually
Bits, second plus 20%, third time plus 20% the 4th time plus 20%, until smelting equipment is filled up, is fused into molten metal, pours
Stokehold exemplar is infused, by the content of laboratory detection chemical component, corresponding shortage metallic element is then added, and be uniformly mixed,
Form potting syrup.
Casting process: pouring into ladle for the 40% of the potting syrup gross mass melted, and it is anti-to be put into nodulizer progress nodularization
It answers, the nodulizer quality is pour into ladle potting syrup quality 1.0%, allows molten metal filing bulb separationization 5 minutes, then by nodularization
Good potting syrup divides parcel to carry out sand mold casting.12~20 hours are kept the temperature in sand mold, natural cooling molding.
Heat treatment: weathering.
Use equipment: LD500/350kW electric furnace.
The mechanical performance of the present embodiment product testing is as follows:
The microstructure examination figure of the present embodiment product is as shown in Figure 3 and Figure 4, and inspection project is Spheroidal Graphite Cast Iron Metallographic Structure-ball
Change classification and evaluation (GB/T9441-2009), judge by comparing method, wherein Fig. 3 is the present embodiment figure, and Fig. 4 is standard drawing, is produced
Product are qualified.
Embodiment 3
By mass percentage, take respectively 84% iron filings, 10% steel scrap, 1.5% carburant, 1.8% ferrosilicon,
1.2% manganese iron and 1.5% silicon titanate innoculant, chemical Composition Control are as shown below:
| Chemical component | C | Si | Mn | P | S | Remaining Mg | Remaining Re |
| Content % | 3.7 | 2.6 | 0.6 | 0.05 | <0.02 | 0.05 | 0.05 |
Melting process step: raw material is added in furnace in four times, and the 40% of total mass of raw material is added for the first time, adds carburetting
Agent, the carburant being added accounts for is added the 4% of material quality for the first time, and smelting equipment is heated to 1400~1500 DEG C of process
In, with the continuous fusing of iron filings, addition iron filings gradually, second plus 20%, third time plus 20%, the 4th time plus 20%,
Until smelting equipment is filled up, it is fused into molten metal, exemplar before pouring furnace is detected the content of chemical component by laboratory, then
Corresponding shortage metallic element is added, and is uniformly mixed, forms potting syrup.
Casting process: pouring into ladle for the 45% of the potting syrup gross mass melted, and it is anti-to be put into nodulizer progress nodularization
It answers, the nodulizer quality is pour into ladle potting syrup quality 1.1%, allows molten metal filing bulb separationization 6 minutes, then by nodularization
Good potting syrup divides parcel to carry out sand mold casting.12~20 hours are kept the temperature in sand mold, natural cooling molding.
Heat treatment: weathering.
Use equipment: LD500/350kW electric furnace.
The mechanical performance of the present embodiment product testing is as follows:
The microstructure examination figure of the present embodiment product is as shown in Figure 5 and Figure 6, and inspection project is Spheroidal Graphite Cast Iron Metallographic Structure-ball
Change classification and evaluation (GB/T9441-2009), judge by comparing method, wherein Fig. 5 is the present embodiment figure, and Fig. 6 is standard drawing, is produced
Product are qualified.
Embodiment 4
By mass percentage, take respectively 80% iron filings, 13.6% steel scrap, 1.8% carburant, 1.8% ferrosilicon,
1.3% manganese iron and 1.5% silicon titanate innoculant add up to 100%, and chemical Composition Control is as shown below:
| Chemical component | C | Si | Mn | P | S | Remaining Mg | Remaining Re |
| Content % | 3.6 | 2.6 | 0.5 | 0.05 | <0.02 | 0.05 | 0.05 |
Processing step is same as Example 2.The present embodiment detects mechanical performance and metallographic structure is qualified.
Embodiment 5
By mass percentage, take respectively 87% iron filings, 7.5% steel scrap, 1.5% carburant, 1.2% ferrosilicon,
1.3% manganese iron and 1.5% silicon titanate innoculant add up to 100%, and chemical Composition Control is as shown below:
| Chemical component | C | Si | Mn | P | S | Remaining Mg | Remaining Re |
| Content % | 3.6 | 2.6 | 0.5 | 0.04 | <0.02 | 0.05 | 0.05 |
Processing step is same as Example 3.The present embodiment detects mechanical performance and metallographic structure is qualified.
Claims (4)
1. a kind of spheroidal graphite cast-iron blank casting method, it is characterised in that:
Step 1: by constitutive material weight proportion iron filings 75~90%, steel scrap 5~18%, carburant 1.5~2%, ferrosilicon 1.5~
2%, manganese iron 1~1.5% and silicon titanate innoculant 1~1.5% add up to 100%, control its chemical component C:3.5~3.9%, Si:
2.0~3.1%, Mn:0.3~0.8, for P content less than 0.08%, S content less than 0.03%, remaining Mg:0.03~0.06% is residual
Remaining Re::0.02~0.06%；
Step 2: raw material is added into smelting equipment for the first time, and added material quality is 35% of total mass of raw material in step 1
~45%, then carburant is added at one time, then smelting equipment is begun to warm up；
Step 3: during the smelting equipment is heated to 1400~1500 DEG C, point 3~5 addition steps into smelting equipment
Remaining raw material in rapid 1, and the material quality added every time is identical, until smelting equipment is all added in step 1 surplus stock；
Step 4: metal is all fused into molten metal in smelting equipment, detects chemical composition content, and adds in above-mentioned molten metal
Enter the metal element accordingly lacked, is uniformly mixed and forms potting syrup；
Step 5: a part of potting syrup being poured into ladle, the potting syrup poured into ladle accounts for potting syrup in step 4
Then the 40~50% of gross mass are added nodulizer and carry out spheroidizing reacion, the nodulizer quality of the addition is to pour into ladle
The 1.0~1.2% of potting syrup quality make molten metal filing bulb separationization 3~7 minutes in ladle, then the potting syrup that nodularization is good
Divide parcel to carry out sand mold casting, and keeps the temperature 12~20 hours in sand mold, natural cooling molding.
2. spheroidal graphite cast-iron blank casting method according to claim 1, it is characterised in that: manganese iron used in raw material in step 1
Contain 75%Si and 8%Ba containing 95~96%C, silicon titanate innoculant containing 75%Si, carburant containing 75%Mn, ferrosilicon.
3. spheroidal graphite cast-iron blank casting method according to claim 1, it is characterised in that: the nodulizer is
QRMg8RE5。
4. spheroidal graphite cast-iron blank casting method according to claim 1, it is characterised in that: smelting equipment used is electric furnace.
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| CN201811030387.XA CN109136726A (en) | 2018-09-05 | 2018-09-05 | A kind of spheroidal graphite cast-iron blank casting method |
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| CN201811030387.XA CN109136726A (en) | 2018-09-05 | 2018-09-05 | A kind of spheroidal graphite cast-iron blank casting method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5433215A (en) * | 1977-08-17 | 1979-03-10 | Rikachieba Proizv Obiedeinenie | Continous production method of nodular cast iron |
| CN104120332A (en) * | 2014-07-31 | 2014-10-29 | 大连金州茂隆实业有限公司 | High-strength high-toughness ductile cast iron 600-10 and production method thereof |
| CN104561734A (en) * | 2013-10-22 | 2015-04-29 | 青岛和德隆机械有限公司 | Method for preparing nodular cast iron by smelting scrap iron |
-
2018
- 2018-09-05 CN CN201811030387.XA patent/CN109136726A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5433215A (en) * | 1977-08-17 | 1979-03-10 | Rikachieba Proizv Obiedeinenie | Continous production method of nodular cast iron |
| CN104561734A (en) * | 2013-10-22 | 2015-04-29 | 青岛和德隆机械有限公司 | Method for preparing nodular cast iron by smelting scrap iron |
| CN104120332A (en) * | 2014-07-31 | 2014-10-29 | 大连金州茂隆实业有限公司 | High-strength high-toughness ductile cast iron 600-10 and production method thereof |
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