CN107299179A - A kind of spheroidal graphite iron casting process - Google Patents
A kind of spheroidal graphite iron casting process Download PDFInfo
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- CN107299179A CN107299179A CN201710510153.4A CN201710510153A CN107299179A CN 107299179 A CN107299179 A CN 107299179A CN 201710510153 A CN201710510153 A CN 201710510153A CN 107299179 A CN107299179 A CN 107299179A
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- iron
- molten iron
- spheroidal graphite
- casting process
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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
-
- 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
- C21C1/02—Dephosphorising or desulfurising
-
- 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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- 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 provides a kind of spheroidal graphite iron casting process, and the technique comprises the following steps：First, steel scrap, the pig iron, ferrochrome, ferromanganese and ferrosilicon are added to melting in intermediate frequency furnace, obtain molten iron；2nd, molten iron temperature is heated, when reaching 2,000 2350 DEG C, carburant is added into molten iron；When molten iron temperature the 3rd, being reduced into 1,450 1550 DEG C, desulfurizing agent is added into molten iron, desulfurization process is carried out；4th, molten iron temperature is reduced to 1,300 1400 DEG C, carries out dephosphorization treatment；5th, molten iron is come out of the stove carry out spheroidising after dephosphorization treatment, then pours shaping, be cooled to.Present invention process is simple to operate, raw material are easy to get, can to steel scrap material carry out effectively using, turn waste into wealth, substantially reduce the production cost of cast iron, increase economic efficiency, moreover, being produced using this method, obtained cast iron impact flexibility is good, hardness is high, and the index such as its chemical analysis closely related with quality, metallographic structure, mechanical performance can be up to state standards defined related request.
Description
Technical field
The invention belongs to Casting Technology field, and in particular to a kind of spheroidal graphite iron casting process.
Background technology
Nodular graphite iron is one of current most widely used cast iron materials, and it has, and intensity is high, elongation is big, fatigue resistance
By force, it is important founding materials the characteristics of excellent wear-resisting property, it is using scope throughout automobile, agricultural machinery, ship, metallurgy, change
Gong Deng departments.Existing spheroidal graphite iron casting process nodulizer absorptivity caused by spheroidizing reacion is unstable is low, and molten iron, which is spilt, to be taken out of
Nodulizer causes nodulizer usage amount big, while flash of light and dense smoke operating environment of pollution during because of nodularization.
Existing spheroidal graphite cast-iron production mainly uses the pig iron and foundry returns to carry out spheroidising after melting and obtain；Or
A small amount of steel scrap is added in traditional spheroidal graphite cast-iron dispensing, and (its addition is at most not more than 15%, still needs to add a large amount of new lives
Iron).Its founding materials is based on the new pig iron, and cost is high, and profit is low.The maximum differential of steel and iron is exactly the number of phosphorus content,
Phosphorus content be less than 2.11% for steel, be iron more than 2.11%.So as to the tissue of steel and iron, mechanical performance just generate it is very big
Difference.Steel is transformed into iron, its production technology is complex, to be transformed into spheroidal graphite cast-iron and just be more difficult to.Because spheroidal graphite cast-iron
Tissue, the shape of graphite, under low phosphorus content hardly possible formed.
At present, part researcher also begins attempt to produce spheroidal graphite cast-iron using steel scrap and foundry returns etc. for raw material.Due to
Steel scrap has the low feature of phosphorus content in itself, and to solve, phosphorus content is low to ask for the main addition by carburant in process of production
Topic.But the addition of carburant and the sequencing of addition etc. are highly important, and can it can directly influence final products
Be up to state standards the index of correlation of requirement；And in the prior art also not on the report for the good solution for solving problems
Road.
The content of the invention
It is an object of the invention to provide a kind of spheroidal graphite iron casting process, present invention process is simple to operate, and raw material are easy to get, can
To steel scrap material carry out effectively using, turn waste into wealth, hence it is evident that reduction cast iron production cost, increase economic efficiency, moreover, utilize
The obtained cast iron impact flexibility of this method production is good, hardness is high, its chemical analysis closely related with quality, metallographic structure, machine
The indexs such as tool performance can be up to state standards defined related request.
The invention provides following technical scheme：
A kind of spheroidal graphite iron casting process, comprises the following steps：
First, steel scrap, the pig iron, ferrochrome, ferromanganese and ferrosilicon are added to melting in intermediate frequency furnace, obtain molten iron；
2nd, molten iron temperature is heated, when reaching 2000-2350 DEG C, carburant is added into molten iron；
When molten iron temperature the 3rd, being reduced into 1450-1550 DEG C, desulfurizing agent is added into molten iron, desulfurization process is carried out；
4th, molten iron temperature is reduced to 1300-1400 DEG C, carries out dephosphorization treatment；
5th, molten iron is come out of the stove carry out spheroidising after dephosphorization treatment, then pours shaping, be cooled to normal temperature.
It is preferred that, the step one first by steel scrap and the pig iron fusing after, carry out deoxidation operation, add ferrochrome, ferromanganese and
Ferrosilicon, advantageously reduces material and is aoxidized in fusion process, prevents from producing impurity in the molten iron to be formed.
It is preferred that, the ferrochrome, ferromanganese and ferrosilicon first carry out baking processing, baking temperature is 300- before smelting furnace is added
550 DEG C, 2-3h is toasted, is conducive to accelerating the melting of material, shortens preparation time.
It is preferred that, the step 2 carburant is graphite carburant, and the lower cost for material can effectively strengthen nodular graphite iron
Hardness, can reduce technique cost of manufacture, and carbonaceous content is high.
It is preferred that, the step 3 desulfurizing agent is reinforcing iron melt desulfurizing agent, and the lower cost for material can reduce technique system
Make cost.
It is preferred that, after the step 5 spheroidising, inoculation is carried out, formation pours liquid, can cause the ball being made
Black irony hardness, intensity get a promotion.
It is preferred that, the inoculation is that inovulant and coverture are added into molten iron.
It is preferred that, the inovulant is silicon titanate innoculant, and coverture is coke, and the lower cost for material, it is easy to obtain can
Effectively to reduce technique cost of manufacture.
It is preferred that, the addition of the inovulant is the 0.94% of molten iron total amount, and the addition of coverture is molten iron total amount
0.57%。
The beneficial effects of the invention are as follows：
The step one of the present invention first by after steel scrap and pig iron fusing, carries out deoxidation operation, adds ferrochrome, ferromanganese and ferrosilicon, have
Aoxidized beneficial to material is reduced in fusion process, prevent from producing impurity in the molten iron to be formed.
Ferrochrome, ferromanganese and the ferrosilicon of the present invention first carries out baking processing before smelting furnace is added, and is conducive to accelerating the molten of material
Melt, shorten preparation time.
Present invention process is simple to operate, and raw material are easy to get, can to steel scrap material carry out effectively using, turn waste into wealth, hence it is evident that
The production cost of cast iron is reduced, is increased economic efficiency, moreover, the cast iron impact flexibility obtained using this method production is good, hardness
Height, the index such as its chemical analysis closely related with quality, metallographic structure, mechanical performance can be up to state standards defined phase
Close and require.
Embodiment
Embodiment 1
A kind of spheroidal graphite iron casting process, comprises the following steps：
First, steel scrap, the pig iron, ferrochrome, ferromanganese and ferrosilicon are added to melting in intermediate frequency furnace, obtain molten iron；
2nd, molten iron temperature is heated, when reaching 2350 DEG C, carburant is added into molten iron；
When molten iron temperature the 3rd, being reduced into 1450 DEG C, desulfurizing agent is added into molten iron, desulfurization process is carried out；
4th, molten iron temperature is reduced to 1400 DEG C, carries out dephosphorization treatment；
5th, molten iron is come out of the stove carry out spheroidising after dephosphorization treatment, then pours shaping, be cooled to normal temperature.
Step one first by after steel scrap and pig iron fusing, carries out deoxidation operation, adds ferrochrome, ferromanganese and ferrosilicon, be conducive to
Reduce material to aoxidize in fusion process, prevent from producing impurity in the molten iron to be formed.
Ferrochrome, ferromanganese and ferrosilicon first carry out baking processing before smelting furnace is added, and baking temperature is 300 DEG C, toasts 3h, has
Beneficial to the melting for accelerating material, shorten preparation time.
Step 2 carburant is graphite carburant, and the lower cost for material can effectively strengthen the hardness of nodular graphite iron, can be with
Technique cost of manufacture is reduced, and carbonaceous content is high.
Step 3 desulfurizing agent is reinforcing iron melt desulfurizing agent, and the lower cost for material can reduce technique cost of manufacture.
After step 5 spheroidising, inoculation is carried out, formation pours liquid, the spheroidal graphite irony hardness that can be made,
Intensity gets a promotion.
Inoculation is that inovulant and coverture are added into molten iron.
Inovulant is silicon titanate innoculant, and coverture is coke, and the lower cost for material, it is easy to obtain can be reduced effectively
Technique cost of manufacture.
The addition of inovulant is the 0.94% of molten iron total amount, and the addition of coverture is the 0.57% of molten iron total amount.
Embodiment 2
A kind of spheroidal graphite iron casting process, comprises the following steps：
First, steel scrap, the pig iron, ferrochrome, ferromanganese and ferrosilicon are added to melting in intermediate frequency furnace, obtain molten iron；
2nd, molten iron temperature is heated, when reaching 2000 DEG C, carburant is added into molten iron；
When molten iron temperature the 3rd, being reduced into 1450 DEG C, desulfurizing agent is added into molten iron, desulfurization process is carried out；
4th, molten iron temperature is reduced to 1300 DEG C, carries out dephosphorization treatment；
5th, molten iron is come out of the stove carry out spheroidising after dephosphorization treatment, then pours shaping, be cooled to normal temperature.
Step one first by after steel scrap and pig iron fusing, carries out deoxidation operation, adds ferrochrome, ferromanganese and ferrosilicon, be conducive to
Reduce material to aoxidize in fusion process, prevent from producing impurity in the molten iron to be formed.
Ferrochrome, ferromanganese and ferrosilicon first carry out baking processing before smelting furnace is added, and baking temperature is 550 DEG C, toasts 3h, has
Beneficial to the melting for accelerating material, shorten preparation time.
Step 2 carburant is graphite carburant, and the lower cost for material can effectively strengthen the hardness of nodular graphite iron, can be with
Technique cost of manufacture is reduced, and carbonaceous content is high.
Step 3 desulfurizing agent is reinforcing iron melt desulfurizing agent, and the lower cost for material can reduce technique cost of manufacture.
After step 5 spheroidising, inoculation is carried out, formation pours liquid, the spheroidal graphite irony hardness that can be made,
Intensity gets a promotion.
Inoculation is that inovulant and coverture are added into molten iron.
Inovulant is silicon titanate innoculant, and coverture is coke, and the lower cost for material, it is easy to obtain can be reduced effectively
Technique cost of manufacture.
The addition of inovulant is the 0.94% of molten iron total amount, and the addition of coverture is the 0.57% of molten iron total amount.
Embodiment 3
A kind of spheroidal graphite iron casting process, comprises the following steps：
First, steel scrap, the pig iron, ferrochrome, ferromanganese and ferrosilicon are added to melting in intermediate frequency furnace, obtain molten iron；
2nd, molten iron temperature is heated, when reaching 2350 DEG C, carburant is added into molten iron；
When molten iron temperature the 3rd, being reduced into 1550 DEG C, desulfurizing agent is added into molten iron, desulfurization process is carried out；
4th, molten iron temperature is reduced to 1400 DEG C, carries out dephosphorization treatment；
5th, molten iron is come out of the stove carry out spheroidising after dephosphorization treatment, then pours shaping, be cooled to normal temperature.
Step one first by after steel scrap and pig iron fusing, carries out deoxidation operation, adds ferrochrome, ferromanganese and ferrosilicon, be conducive to
Reduce material to aoxidize in fusion process, prevent from producing impurity in the molten iron to be formed.
Ferrochrome, ferromanganese and ferrosilicon first carry out baking processing before smelting furnace is added, and baking temperature is 550 DEG C, toasts 3h, has
Beneficial to the melting for accelerating material, shorten preparation time.
Step 2 carburant is graphite carburant, and the lower cost for material can effectively strengthen the hardness of nodular graphite iron, can be with
Technique cost of manufacture is reduced, and carbonaceous content is high.
Step 3 desulfurizing agent is reinforcing iron melt desulfurizing agent, and the lower cost for material can reduce technique cost of manufacture.
After step 5 spheroidising, inoculation is carried out, formation pours liquid, the spheroidal graphite irony hardness that can be made,
Intensity gets a promotion.
Inoculation is that inovulant and coverture are added into molten iron.
Inovulant is silicon titanate innoculant, and coverture is coke, and the lower cost for material, it is easy to obtain can be reduced effectively
Technique cost of manufacture.
The addition of inovulant is the 0.94% of molten iron total amount, and the addition of coverture is the 0.57% of molten iron total amount.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, although with reference to foregoing reality
Apply example the present invention is described in detail, for those skilled in the art, it still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent substitution to which part technical characteristic.All essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (9)
1. a kind of spheroidal graphite iron casting process, it is characterised in that comprise the following steps：
First, steel scrap, the pig iron, ferrochrome, ferromanganese and ferrosilicon are added to melting in intermediate frequency furnace, obtain molten iron；
2nd, molten iron temperature is heated, when reaching 2000-2350 DEG C, carburant is added into molten iron；
When molten iron temperature the 3rd, being reduced into 1450-1550 DEG C, desulfurizing agent is added into molten iron, desulfurization process is carried out；
4th, molten iron temperature is reduced to 1300-1400 DEG C, carries out dephosphorization treatment；
5th, molten iron is come out of the stove carry out spheroidising after dephosphorization treatment, then pours shaping, be cooled to normal temperature.
2. a kind of spheroidal graphite iron casting process according to claim 1, it is characterised in that the step one is first by steel scrap and life
After iron fusing, deoxidation operation is carried out, ferrochrome, ferromanganese and ferrosilicon is added.
3. a kind of spheroidal graphite iron casting process according to claim 2, it is characterised in that the ferrochrome, ferromanganese and ferrosilicon exist
Add before smelting furnace, first carry out baking processing, baking temperature is 300-550 DEG C, toasts 2-3h.
4. a kind of spheroidal graphite iron casting process according to claim 1, it is characterised in that the step 2 carburant is graphite
Carburant.
5. a kind of spheroidal graphite iron casting process according to claim 1, it is characterised in that the step 3 desulfurizing agent is reinforcing
Iron melt desulfurizing agent.
6. a kind of spheroidal graphite iron casting process according to claim 1, it is characterised in that after the step 5 spheroidising,
Inoculation is carried out, formation pours liquid.
7. a kind of spheroidal graphite iron casting process according to claim 6, it is characterised in that the inoculation is into molten iron
Add inovulant and coverture.
8. a kind of spheroidal graphite iron casting process according to claim 7, it is characterised in that the inovulant is that silicon barium breeds
Agent, coverture is coke.
9. a kind of spheroidal graphite iron casting process according to claim 6, it is characterised in that the addition of the inovulant is iron
The 0.94% of water inventory, the addition of coverture is the 0.57% of molten iron total amount.
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| CN201710510153.4A CN107299179A (en) | 2017-06-28 | 2017-06-28 | A kind of spheroidal graphite iron casting process |
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| CN201710510153.4A CN107299179A (en) | 2017-06-28 | 2017-06-28 | A kind of spheroidal graphite iron casting process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109161631A (en) * | 2018-09-20 | 2019-01-08 | 山东国铭球墨铸管科技有限公司 | The production technology of phosphorus element content is reduced in a kind of manUfaCtUre of pig iron |
| CN114703419A (en) * | 2022-03-31 | 2022-07-05 | 瑞安博宇科技股份有限公司 | Production method of galvanized cast iron for commutator production |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265546A (en) * | 2008-04-30 | 2008-09-17 | 刘建成 | Method for producing spheroidal graphite cast iron from waste steel |
| CN103614611A (en) * | 2013-11-26 | 2014-03-05 | 辽宁工业大学 | Manganese-silicon high-chromium cast iron and preparation method thereof |
| CN105886888A (en) * | 2016-05-18 | 2016-08-24 | 芜湖市和蓄机械股份有限公司 | Method for casting train accessory through isothermal quenching |
-
2017
- 2017-06-28 CN CN201710510153.4A patent/CN107299179A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265546A (en) * | 2008-04-30 | 2008-09-17 | 刘建成 | Method for producing spheroidal graphite cast iron from waste steel |
| CN103614611A (en) * | 2013-11-26 | 2014-03-05 | 辽宁工业大学 | Manganese-silicon high-chromium cast iron and preparation method thereof |
| CN105886888A (en) * | 2016-05-18 | 2016-08-24 | 芜湖市和蓄机械股份有限公司 | Method for casting train accessory through isothermal quenching |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109161631A (en) * | 2018-09-20 | 2019-01-08 | 山东国铭球墨铸管科技有限公司 | The production technology of phosphorus element content is reduced in a kind of manUfaCtUre of pig iron |
| CN114703419A (en) * | 2022-03-31 | 2022-07-05 | 瑞安博宇科技股份有限公司 | Production method of galvanized cast iron for commutator production |
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