CN106591695A - High strength and tenacity ferrite base vermicular graphite cast iron material and preparing method thereof - Google Patents
High strength and tenacity ferrite base vermicular graphite cast iron material and preparing method thereof Download PDFInfo
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- CN106591695A CN106591695A CN201710002938.0A CN201710002938A CN106591695A CN 106591695 A CN106591695 A CN 106591695A CN 201710002938 A CN201710002938 A CN 201710002938A CN 106591695 A CN106591695 A CN 106591695A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C37/00—Cast-iron alloys
- C22C37/10—Cast-iron alloys containing aluminium or silicon
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- 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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- Materials Engineering (AREA)
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- 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 high strength and tenacity ferrite base vermicular graphite cast iron material and a preparing method thereof. The vermicular graphite cast iron material can bear high heat loads and high mechanical loads, and therefore the requirements for high horsepower, high torque, low exhaust emission and fuel using amount reduction are met. According to the technical scheme, the vermicular graphite cast iron material comprises 3.6%-3.7% of carbon, 2.2%-2.4% of silicon, 0.3%-0.5% of manganese, less than 0.02% of sulfur, less than 0.07% of phosphorus, 0.6%-0.7% of copper, 0.01%-0.03% of tin and 0.35%-0.55% of aluminum. Three times of inoculation is adopted, wherein at the first time of inoculation, silicon iron is added into a furnace, at the second time of inoculation, an inoculation is added into a lip-pour ladle, and at the third time of inoculation, metal-stream inoculation is carried out when molten iron is discharged out of the furnace. The high strength and tenacity ferrite base vermicular graphite cast iron material and the preparing method can be widely applied to the field of material preparation.
Description
Technical field
A kind of high-strength tough ferrite base vermicular graphite iron material of the invention and preparation method thereof, belongs to material preparation technology neck
Domain.
Background technology
Vermicular cast iron（Hereinafter referred to as compacted iron）It is engineering material that the 70's of 20th century start to be applied, producer
Method is to add suitable vermiculizer in molten iron when tapping a blast furnace, and carries out creepage rate, be subsequently adding inovulant carry out educating process and
It is obtained.Ratio-dependent nodulizing rate of the vermicular cast iron according to shared by quasiflake graphite in graphite form.Because vermicular cast iron has ball concurrently
The performance of black cast iron and casting pig, therefore, it has unique purposes, in ingot mould, automobile engine, blast pipe, glass molds
Development speed is not so good as ball over the application of the aspects such as tool, diesel engine cylinder cover, braking component achieves good effect, but 40 years
Iron is rapid like that.One of major reason of compacted iron development is affected to be exactly that nodulizing rate scope is difficult to control to.
At present vermicular cast iron main raw material(s) is carbon 3.4～3.8%, sulphur≤0.05%, silicon 1.8～2.6%, phosphorus≤
0.50%, manganese 0.5～1.0%, chromium 0.2～0.5%, copper 0.2～0.5%, balance of Fe.Using the chemical group described in the invention
Into compacted graphite cast iron air cylinder sleeve working surface hardness be 260～320HB, 430～520MPa of tensile strength, meet high intensity and height
Wearability is required, and advantage of lower cost, is entirely capable of meeting contemporary high speed, high strengthening, high-performance, low emission, long-life big work(
The requirement of rate internal combustion engine.There is substantial amounts of graphite in the cast iron, the toughness and tensile strength of material are all limited by very large.
The content of the invention
Instant invention overcomes the deficiency that prior art is present, there is provided a kind of high-strength tough ferrite base vermicular graphite iron material and
Its preparation method, the vermicular graphite iron material can bear high heat load and high mechanical load, to meet to the high horse of Diesel engine
The demand of power, high torque (HT), low exhaust gas emission and reduction fuel usage amount.
In order to solve above-mentioned technical problem, the technical solution used in the present invention is：The compacted black casting of the high-strength tough ferrite base of one kind
Iron material, each element content is in vermicular graphite iron material：
Carbon（C）：3 .6%～3 .7%；Silicon（Si）：2 .2%～2 .4%；Manganese（Mn）：0 .3%～0 .5%；Sulphur（S）：＜ 0
.02%；Phosphorus（P）：The .07% of ＜ 0, copper（Cu）：0 .6%～0 .7%；Tin（Sn）：0 .01%～0 .03%, aluminium（Al）：0.35%～
0.55%。
Preferably, the vermicular cast iron includes following raw material ratio：
The one-level pig iron：85%～88%；Mild steel：9%～11%；Silicon iron inoculator：0 .5%～0 .65%；Ferromanganese：0 .3%～0
.5% ；Rare earth-Si-Fe-Mg vermiculizer：0 .4%～0 .6%；Silicon titanate innoculant：0 .4%～0 .55%.
A kind of preparation method of vermicular graphite iron material as above of the present invention, is bred using three times, is wherein added in stove
Ferrosilicon is to breed for the first time, subcontracts plus inovulant is to breed for the second time, and when molten iron is come out of the stove, current-following inoculation is that third time breeds；Tool
Body operating procedure is as follows：
（1）Breed for the first time：Silicon iron inoculator is put in intermediate frequency furnace and is bred, temperature rises to 1500 DEG C or so, add copper
And aluminium, temperature control is bred at 1550-1580 DEG C；
（2）Breed for the second time：Treatment temperature taps a blast furnace about 2/3 at 1480 DEG C～1500 DEG C, using bag bottom pit pour method carry out it is compacted
Change, inoculation, add 0 .3%～0 .4% silicon titanate innoculants；
（3）Third time breeds：Tap a blast furnace and 1/3 bred；0 .1%～0 .15% silicon titanate innoculants and tin, temperature are added with flowing molten iron
Control is at 1380 DEG C ~ 1420 DEG C.
The present invention has an advantageous effect in that compared with prior art：Strict control carbon in the present invention（C）Content, both ensured
It is easy to graphitization, while in turn ensure that the mechanical property of material；A small amount of manganese（Mn）Addition, there is material and be sent to
Intensity and hardness, and reduce manganese（Mn）Impact to its plasticity；Add Al to improve ferritic quantity, improve plasticity and tough
Property, while improving the pattern of worm graphite, improve nodulizing rate.Add Cu and Sn to promote pearlite generation, improve the strong of material
Degree.
Meanwhile, three inoculation methods that the present invention is combined by ferrosilicon and silicon barium, while adding tri- kinds of alloys of Cu, Sn and Al
Element, prepares vermicular graphite iron material, realizing while not only improve nodulizing rate but also improve intensity and modeling, toughness, and prepared is compacted
Black cast iron materials, its room temperature tensile intensity >=400MPa, elongation percentage >=3.5%, hardness reaches 180-200HBW, the more existing trade mark
The compacted ink material performance room temperature tensiles of Rut350 stretch and improve 22%, elongation percentage improves 120%.
Specific embodiment
Below by specific embodiment, the present invention is explained in detail.
Embodiment one
According to proportion of raw material：The .5% of the one-level pig iron 87, mild steel 10%, the .64% of ferrosilicon 0, the .3% of ferromanganese 0, vermiculizer 0
.5%, the .33% of silicon titanate innoculant 0, the .11% of current-following inoculation 0；Alloying element content：The .7% of copper (Cu) 0, tin (Sn) 0
.03%, aluminium（Al）0.45%.
Concrete grammar prepared by material is as follows：
（1）The pig iron for weighing up, mild steel, ferromanganese, ferrosilicon are put in intermediate frequency furnace carries out melting；When temperature rises to 1500 DEG C of left sides
The right side, adds copper, aluminium, temperature to rise to 1550 DEG C, come out of the stove；
（2）Creepage rate temperature pours method at 1485 DEG C using bag bottom pit, and tapping a blast furnace about 2/3 or 3/4 carries out compactedization womb
Reason.
（3）Go out remaining iron liquid for the second time and added tin, and add the current-following inoculation of 0 .11%, stirring to skim, pour with flowing molten iron
1400 DEG C of temperature of note.
Wherein, the ferrosilicon of 0 .64% is added in incubation period first time in stove；Second incubation period is subcontracted the 0 of bottom
.33% silicon titanate innoculant；The silicon titanate innoculant category of 0 .11% is being added with flowing molten iron in third time incubation period.
It is compound inoculated by ferrosilicon and silicon barium, while adding copper (Cu), tin (Sn), aluminium in compacted iron（Al）, it is made
The vermicular graphite iron material for obtaining, its tensile strength（Rm）Room temperature be 403MPa, room temperature elongation percentage（A）：3.5%, hardness (HBW)
For 189HBW；Nodulizing rate is 85%, and ferrite content is 55%.
Embodiment two
According to proportion of raw material：The .2% of the one-level pig iron 87, mild steel 10%, the .62% of ferrosilicon 0, the .7% of ferromanganese 0, vermiculizer 0
.48%, the .35% of silicon titanate innoculant 0, the .13% of current-following inoculation 0；Alloying element content：The .6% of copper (Cu) 0, tin (Sn) 0
.03%, aluminium（Al）0.5%.
Concrete grammar prepared by material is as follows：
（1）The pig iron for weighing up, mild steel, ferromanganese, ferrosilicon are put in intermediate frequency furnace carries out melting, when temperature rises to 1500 DEG C of left sides
The right side, adds copper, aluminium, temperature to rise to 1550 DEG C, prepare to come out of the stove；
（2）Creepage rate temperature pours method at 1455 DEG C using bag bottom pit, and tapping a blast furnace about 2/3 or 3/4 carries out compactedization womb
Reason.
（3）Go out remaining iron liquid for the second time and added tin, and add the current-following inoculation of 0 .11%, stirring to skim, pour with flowing molten iron
1390 DEG C of temperature of note.
Wherein, the ferrosilicon of 0 .62% is added in incubation period first time in stove；Subcontract in second incubation period the 0 of bottom
.35% silicon titanate innoculant；The silicon titanate innoculant category of 0 .13% is being added with flowing molten iron in third time incubation period.
It is compound inoculated by ferrosilicon and silicon barium, while adding copper (Cu), tin (Sn), aluminium in compacted iron（Al）, it is made
The vermicular graphite iron material for obtaining, its tensile strength（Rm）Room temperature be 399MPa, room temperature elongation percentage（A）：3.8%, hardness (HBW)
For 180HBW；Nodulizing rate is 90%, and ferrite content is 55%.
Embodiment three
According to proportion of raw material：The .6% of the one-level pig iron 87, mild steel 10%, the .64% of ferrosilicon 0, the .3% of ferromanganese 0, vermiculizer 0
.51%, the .38% of silicon titanate innoculant 0, the .1% of current-following inoculation 0；Alloying element content：The .6% of copper (Cu) 0, tin (Sn) 0
.03%, aluminium（Al）0.55%.
Concrete grammar prepared by material is as follows：
（1）The pig iron for weighing up, mild steel, ferromanganese, ferrosilicon are put in intermediate frequency furnace carries out melting, and temperature rises to 1500 DEG C or so,
Copper, aluminium, temperature is added to rise to 1550 DEG C, prepare to come out of the stove；
（2）Creepage rate temperature pours method at 1475 DEG C using bag bottom pit, and tapping a blast furnace about 2/3 or 3/4 carries out compactedization womb
Reason.
（4）Go out remaining iron liquid for the second time and added tin, and add the current-following inoculation of 0 .11%, stirring to skim, pour with flowing molten iron
1380 DEG C of temperature of note.
Wherein, the ferrosilicon of 0 .62% is added in incubation period first time in stove；Subcontract in second incubation period the 0 of bottom
.35% silicon titanate innoculant；Third time breeds the inherent silicon titanate innoculant category with flowing molten iron 0 .13% of addition.
It is compound inoculated by ferrosilicon and silicon barium, while adding copper (Cu), tin (Sn), aluminium in compacted iron（Al）, it is made
The vermicular graphite iron material for obtaining, its tensile strength（Rm）Room temperature be 409MPa, room temperature elongation percentage（A）：3.67%, hardness (HBW)
For 185HBW；Nodulizing rate is 90%, and ferrite content is 60%.
The present invention is explained in detail above in conjunction with embodiment, but the present invention is not limited to above-described embodiment, at this
In the ken that field those of ordinary skill possesses, can be making various changes on the premise of without departing from present inventive concept
Change.
Claims (3)
1. a kind of high-strength tough ferrite base vermicular graphite iron material, it is characterised in that each element content is in vermicular graphite iron material：
Carbon（C）：3 .6%～3 .7%；Silicon（Si）：2 .2%～2 .4%；Manganese（Mn）：0 .3%～0 .5%；Sulphur（S）：＜ 0
.02%；Phosphorus（P）：The .07% of ＜ 0, copper（Cu）：0 .6%～0 .7%；Tin（Sn）：0 .01%～0 .03%, aluminium（Al）：0.35%～
0.55%。
2. the high-strength tough ferrite base vermicular graphite iron material of one kind according to claim 1, it is characterised in that the compacted ink casting
Iron includes following raw material ratio：
The one-level pig iron：85%～88%；Mild steel：9%～11%；Silicon iron inoculator：0 .5%～0 .65%；Ferromanganese：0 .3%～0
.5% ；Rare earth-Si-Fe-Mg vermiculizer：0 .4%～0 .6%；Silicon titanate innoculant：0 .4%～0 .55%.
3. a kind of preparation method of vermicular graphite iron material as claimed in claim 1, it is characterised in that bred using three times, its
Add in middle stove ferrosilicon to be to breed for the first time, subcontract plus inovulant is to breed for the second time, current-following inoculation is the when molten iron is come out of the stove
Breed for three times；Concrete operation step is as follows：
（1）Breed for the first time：Silicon iron inoculator is put in intermediate frequency furnace and is bred, temperature rises to 1500 DEG C or so, add copper
And aluminium, temperature control is bred at 1550-1580 DEG C；
（2）Breed for the second time：Treatment temperature taps a blast furnace about 2/3 at 1480 DEG C～1500 DEG C, using bag bottom pit pour method carry out it is compacted
Change, inoculation, add 0 .3%～0 .4% silicon titanate innoculants；
（3）Third time breeds：Tap a blast furnace and 1/3 bred；0 .1%～0 .15% silicon titanate innoculants and tin, temperature are added with flowing molten iron
Control is at 1380 DEG C ~ 1420 DEG C.
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| CN201710002938.0A CN106591695A (en) | 2017-01-04 | 2017-01-04 | High strength and tenacity ferrite base vermicular graphite cast iron material and preparing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108330384A (en) * | 2018-02-08 | 2018-07-27 | 东风商用车有限公司 | It is a kind of that there is high intensity, the heavy-duty commercial vehicle brake drum material of high thermal fatigue property |
| CN109202013A (en) * | 2018-10-22 | 2019-01-15 | 安徽大天铸业有限责任公司 | A kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting |
| CN109468524A (en) * | 2018-11-02 | 2019-03-15 | 常熟市金诺精工模具有限公司 | The manufacturing method of thermal fatigue resistance cast iron glass ware mould material |
| CN113106184A (en) * | 2021-03-29 | 2021-07-13 | 宜昌船舶柴油机有限公司 | Casting method of high-carbon low-silicon titanium-free vermicular graphite cast iron material |
| CN113862553A (en) * | 2021-09-06 | 2021-12-31 | 武汉理工大学 | Isothermal quenching synthetic vermicular cast iron RuT1000-2 and preparation method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108330384A (en) * | 2018-02-08 | 2018-07-27 | 东风商用车有限公司 | It is a kind of that there is high intensity, the heavy-duty commercial vehicle brake drum material of high thermal fatigue property |
| CN109202013A (en) * | 2018-10-22 | 2019-01-15 | 安徽大天铸业有限责任公司 | A kind of casting technique of vermicular cast iron all-hydraulic steering gear body shell casting |
| CN109468524A (en) * | 2018-11-02 | 2019-03-15 | 常熟市金诺精工模具有限公司 | The manufacturing method of thermal fatigue resistance cast iron glass ware mould material |
| CN113106184A (en) * | 2021-03-29 | 2021-07-13 | 宜昌船舶柴油机有限公司 | Casting method of high-carbon low-silicon titanium-free vermicular graphite cast iron material |
| CN113862553A (en) * | 2021-09-06 | 2021-12-31 | 武汉理工大学 | Isothermal quenching synthetic vermicular cast iron RuT1000-2 and preparation method thereof |
| CN113862553B (en) * | 2021-09-06 | 2022-11-15 | 武汉理工大学 | Isothermal quenching synthetic vermicular cast iron RuT1000-2 and preparation method thereof |
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